Upgrade syn crate to 2.0 version (#1157)

- replace `proc-macro-error` crate with simplified `common::diagnostic::pollyfill`
- migrate `juniper_codegen_tests` to stable Rust

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Kai Ren <tyranron@gmail.com>

.github/workflows/ci.yml

@@ -141,13 +141,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        msrv: ["1.65.0"]
+        msrv: ["1.73.0"]
         crate:
           - juniper_codegen
           - juniper
           - juniper_subscriptions
           - juniper_graphql_ws
-          #- juniper_actix
+          - juniper_actix
           - juniper_hyper
           #- juniper_iron
           - juniper_rocket
@@ -156,10 +156,6 @@ jobs:
           - ubuntu
           - macOS
           - windows
-        include:
-          - { msrv: "1.68.0", crate: "juniper_actix", os: "ubuntu" }
-          - { msrv: "1.68.0", crate: "juniper_actix", os: "macOS" }
-          - { msrv: "1.68.0", crate: "juniper_actix", os: "windows" }
     runs-on: ${{ matrix.os }}-latest
     steps:
       - uses: actions/checkout@v4
@@ -217,10 +213,10 @@ jobs:
           - beta
           - nightly
         exclude:
-          - crate: juniper_codegen_tests
-            toolchain: stable
           - crate: juniper_codegen_tests
             toolchain: beta
+          - crate: juniper_codegen_tests
+            toolchain: nightly
           - crate: juniper_codegen_tests
             os: macOS
           - crate: juniper_codegen_tests

Makefile

@@ -120,8 +120,7 @@ ifeq ($(shell rustup component list --toolchain=nightly \
 	rustup component add --toolchain=nightly rust-src
 endif
 endif
-	cargo $(if $(call eq,$(careful),yes),+nightly careful,\
+	cargo $(if $(call eq,$(careful),yes),+nightly careful,) \
-	      $(if $(call eq,$(crate),juniper_codegen_tests),+nightly,)) \
 		test $(if $(call eq,$(crate),),--workspace,-p $(crate)) --all-features
 
 

juniper/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper"
 version = "0.16.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "GraphQL server library."
 license = "BSD-2-Clause"
 authors = [
@@ -68,7 +68,7 @@ time = { version = "0.3", features = ["formatting", "macros", "parsing"], option
 url = { version = "2.0", optional = true }
 uuid = { version = "1.3", default-features = false, optional = true }
 
-# Fixes for MSRV check.
+# Fixes for `minimal-versions` check.
 # TODO: Try remove on upgrade of `bigdecimal` crate.
 num-bigint = { version = "0.4.2", optional = true }
 # TODO: Try remove on upgrade of `chrono-tz` crate.

juniper/README.md

@@ -4,7 +4,7 @@ Juniper (GraphQL server library for Rust)
 [![Crates.io](https://img.shields.io/crates/v/juniper.svg?maxAge=2592000)](https://crates.io/crates/juniper)
 [![Documentation](https://docs.rs/juniper/badge.svg)](https://docs.rs/juniper)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Juniper Book] ([current][Juniper Book] | [edge][Juniper Book edge])
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper/CHANGELOG.md)

juniper_codegen/CHANGELOG.md

@@ -38,6 +38,10 @@ All user visible changes to `juniper_codegen` crate will be documented in this f
 
 - `#[derive(GraphQLInterface)]` macro allowing using structs as GraphQL interfaces. ([#1026])
 
+### Changed
+
+- Migrated to 2 version of `syn` crate. ([#1157])
+
 ### Fixed
 
 - All procedural macros expansion inside `macro_rules!`. ([#1054], [#1051])
@@ -56,6 +60,7 @@ All user visible changes to `juniper_codegen` crate will be documented in this f
 [#1028]: /../../pull/1028
 [#1051]: /../../issues/1051
 [#1054]: /../../pull/1054
+[#1157]: /../../pull/1157
 
 
 

juniper_codegen/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_codegen"
 version = "0.16.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "Code generation for `juniper` crate."
 license = "BSD-2-Clause"
 authors = [
@@ -22,10 +22,9 @@ exclude = ["/release.toml"]
 proc-macro = true
 
 [dependencies]
-proc-macro-error = "1.0.2"
 proc-macro2 = "1.0.4"
 quote = "1.0.9"
-syn = { version = "1.0.90", features = ["extra-traits", "full", "parsing", "visit", "visit-mut"], default-features = false }
+syn = { version = "2.0", features = ["extra-traits", "full", "visit", "visit-mut"] }
 url = "2.0"
 
 [dev-dependencies]

juniper_codegen/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_codegen.svg?maxAge=2592000)](https://crates.io/crates/juniper_codegen)
 [![Documentation](https://docs.rs/juniper_codegen/badge.svg)](https://docs.rs/juniper_codegen)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_codegen/CHANGELOG.md)
 

juniper_codegen/src/common/deprecation.rs

@@ -7,6 +7,7 @@ use proc_macro2::TokenStream;
 use quote::{quote, ToTokens};
 use syn::{
     parse::{Parse, ParseStream},
+    punctuated::Punctuated,
     spanned::Spanned as _,
     token,
 };
@@ -20,7 +21,7 @@ use crate::common::{parse::ParseBufferExt as _, SpanContainer};
 /// [0]: https://spec.graphql.org/October2021#sec--deprecated
 /// [1]: https://spec.graphql.org/October2021#sec-Language.Fields
 /// [2]: https://spec.graphql.org/October2021#sec-Enum-Value
-#[derive(Debug, Default)]
+#[derive(Debug, Default, Eq, PartialEq)]
 pub(crate) struct Directive {
     /// Optional [reason][1] attached to this [deprecation][0].
     ///
@@ -52,8 +53,8 @@ impl Directive {
         attrs: &[syn::Attribute],
     ) -> syn::Result<Option<SpanContainer<Self>>> {
         for attr in attrs {
-            return Ok(match attr.parse_meta() {
+            return Ok(match &attr.meta {
-                Ok(syn::Meta::List(ref list)) if list.path.is_ident("deprecated") => {
+                syn::Meta::List(list) if list.path.is_ident("deprecated") => {
                     let directive = Self::parse_from_deprecated_meta_list(list)?;
                     Some(SpanContainer::new(
                         list.path.span(),
@@ -61,7 +62,7 @@ impl Directive {
                         directive,
                     ))
                 }
-                Ok(syn::Meta::Path(ref path)) if path.is_ident("deprecated") => {
+                syn::Meta::Path(path) if path.is_ident("deprecated") => {
                     Some(SpanContainer::new(path.span(), None, Self::default()))
                 }
                 _ => continue,
@@ -77,20 +78,24 @@ impl Directive {
     ///
     /// If the `#[deprecated(note = ...)]` attribute has incorrect format.
     fn parse_from_deprecated_meta_list(list: &syn::MetaList) -> syn::Result<Self> {
-        for meta in &list.nested {
+        for meta in list.parse_args_with(Punctuated::<syn::Meta, token::Comma>::parse_terminated)? {
-            if let syn::NestedMeta::Meta(syn::Meta::NameValue(nv)) = meta {
+            if let syn::Meta::NameValue(nv) = meta {
                 return if !nv.path.is_ident("note") {
                     Err(syn::Error::new(
                         nv.path.span(),
                         "unrecognized setting on #[deprecated(..)] attribute",
                     ))
-                } else if let syn::Lit::Str(strlit) = &nv.lit {
+                } else if let syn::Expr::Lit(syn::ExprLit {
+                    lit: syn::Lit::Str(strlit),
+                    ..
+                }) = &nv.value
+                {
                     Ok(Self {
                         reason: Some(strlit.clone()),
                     })
                 } else {
                     Err(syn::Error::new(
-                        nv.lit.span(),
+                        nv.value.span(),
                         "only strings are allowed for deprecation",
                     ))
                 };
@@ -112,3 +117,43 @@ impl ToTokens for Directive {
         .to_tokens(into);
     }
 }
+
+#[cfg(test)]
+mod parse_from_deprecated_attr_test {
+    use quote::quote;
+    use syn::parse_quote;
+
+    use super::Directive;
+
+    #[test]
+    fn single() {
+        let desc =
+            Directive::parse_from_deprecated_attr(&[parse_quote! { #[deprecated(note = "foo")] }])
+                .unwrap()
+                .unwrap()
+                .into_inner();
+        assert_eq!(
+            quote! { #desc }.to_string(),
+            quote! { .deprecated(::core::option::Option::Some("foo")) }.to_string(),
+        );
+    }
+
+    #[test]
+    fn no_reason() {
+        let desc = Directive::parse_from_deprecated_attr(&[parse_quote! { #[deprecated] }])
+            .unwrap()
+            .unwrap()
+            .into_inner();
+        assert_eq!(
+            quote! { #desc }.to_string(),
+            quote! { .deprecated(::core::option::Option::None) }.to_string(),
+        );
+    }
+
+    #[test]
+    fn not_deprecation() {
+        let desc =
+            Directive::parse_from_deprecated_attr(&[parse_quote! { #[blah = "foo"] }]).unwrap();
+        assert_eq!(desc, None);
+    }
+}

juniper_codegen/src/common/description.rs

@@ -5,7 +5,10 @@
 
 use proc_macro2::TokenStream;
 use quote::{quote, ToTokens};
-use syn::parse::{Parse, ParseStream};
+use syn::{
+    parse::{Parse, ParseStream},
+    spanned::Spanned as _,
+};
 
 use crate::common::SpanContainer;
 
@@ -36,16 +39,20 @@ impl Description {
     ) -> syn::Result<Option<SpanContainer<Self>>> {
         let (mut first_span, mut descriptions) = (None, Vec::new());
         for attr in attrs {
-            match attr.parse_meta() {
+            match attr.meta {
-                Ok(syn::Meta::NameValue(ref nv)) if nv.path.is_ident("doc") => {
+                syn::Meta::NameValue(ref nv) if nv.path.is_ident("doc") => {
-                    if let syn::Lit::Str(strlit) = &nv.lit {
+                    if let syn::Expr::Lit(syn::ExprLit {
+                        lit: syn::Lit::Str(strlit),
+                        ..
+                    }) = &nv.value
+                    {
                         if first_span.is_none() {
                             first_span = Some(strlit.span());
                         }
                         descriptions.push(strlit.value());
                     } else {
                         return Err(syn::Error::new(
-                            nv.lit.span(),
+                            nv.value.span(),
                             "#[doc] attributes may only have a string literal",
                         ));
                     }

juniper_codegen/src/common/diagnostic.rs

@@ -1,7 +1,8 @@
 use std::fmt;
 
 use proc_macro2::Span;
-use proc_macro_error::{Diagnostic, Level};
+
+pub(crate) use self::polyfill::{abort_if_dirty, emit_error, entry_point, Diagnostic, ResultExt};
 
 /// URL of the GraphQL specification (October 2021 Edition).
 pub(crate) const SPEC_URL: &str = "https://spec.graphql.org/October2021";
@@ -55,13 +56,11 @@ impl Scope {
     }
 
     pub(crate) fn custom<S: AsRef<str>>(&self, span: Span, msg: S) -> Diagnostic {
-        Diagnostic::spanned(span, Level::Error, format!("{self} {}", msg.as_ref()))
+        Diagnostic::spanned(span, format!("{self} {}", msg.as_ref())).note(self.spec_link())
-            .note(self.spec_link())
     }
 
-    pub(crate) fn error(&self, err: syn::Error) -> Diagnostic {
+    pub(crate) fn error(&self, err: &syn::Error) -> Diagnostic {
-        Diagnostic::spanned(err.span(), Level::Error, format!("{self} {err}"))
+        Diagnostic::spanned(err.span(), format!("{self} {err}")).note(self.spec_link())
-            .note(self.spec_link())
     }
 
     pub(crate) fn emit_custom<S: AsRef<str>>(&self, span: Span, msg: S) {
@@ -75,13 +74,279 @@ impl Scope {
     pub(crate) fn no_double_underscore(&self, field: Span) {
         Diagnostic::spanned(
             field,
-            Level::Error,
             "All types and directives defined within a schema must not have a name which begins \
              with `__` (two underscores), as this is used exclusively by GraphQL’s introspection \
-             system."
+             system.",
-                .into(),
         )
         .note(format!("{SPEC_URL}#sec-Schema"))
         .emit();
     }
 }
+
+mod polyfill {
+    //! Simplified version of [`proc_macro_error`] machinery for this crate purposes.
+    //!
+    //! [`proc_macro_error`]: https://docs.rs/proc-macro-error/1
+
+    use std::{
+        cell::{Cell, RefCell},
+        panic::{catch_unwind, resume_unwind, UnwindSafe},
+    };
+
+    use proc_macro2::{Span, TokenStream};
+    use quote::{quote, quote_spanned, ToTokens};
+
+    /// Representation of a single diagnostic message.
+    #[derive(Debug)]
+    pub(crate) struct Diagnostic {
+        span_range: SpanRange,
+        msg: String,
+        suggestions: Vec<String>,
+    }
+
+    impl Diagnostic {
+        /// Create a new [`Diagnostic`] message that points to the provided [`Span`].
+        pub(crate) fn spanned(span: Span, message: impl Into<String>) -> Self {
+            Self {
+                span_range: SpanRange {
+                    first: span,
+                    last: span,
+                },
+                msg: message.into(),
+                suggestions: vec![],
+            }
+        }
+
+        /// Attaches a note to the main message of this [`Diagnostic`].
+        pub(crate) fn note(mut self, msg: impl Into<String>) -> Self {
+            self.suggestions.push(msg.into());
+            self
+        }
+
+        /// Aborts macro execution and display this [`Diagnostic`].
+        pub(crate) fn abort(self) -> ! {
+            self.emit();
+            abort_now()
+        }
+
+        /// Display this [`Diagnostic`] while not aborting macro execution.
+        pub(crate) fn emit(self) {
+            check_correctness();
+            emit_diagnostic(self);
+        }
+    }
+
+    impl ToTokens for Diagnostic {
+        fn to_tokens(&self, ts: &mut TokenStream) {
+            use std::borrow::Cow;
+
+            fn ensure_lf(buf: &mut String, s: &str) {
+                if s.ends_with('\n') {
+                    buf.push_str(s);
+                } else {
+                    buf.push_str(s);
+                    buf.push('\n');
+                }
+            }
+
+            fn diag_to_tokens(
+                span_range: SpanRange,
+                msg: &str,
+                suggestions: &[String],
+            ) -> TokenStream {
+                let message = if suggestions.is_empty() {
+                    Cow::Borrowed(msg)
+                } else {
+                    let mut message = String::new();
+                    ensure_lf(&mut message, msg);
+                    for note in suggestions {
+                        message.push_str("· note: ");
+                        ensure_lf(&mut message, note);
+                    }
+                    Cow::Owned(message)
+                };
+
+                let mut msg = proc_macro2::Literal::string(&message);
+                msg.set_span(span_range.last);
+                let group = quote_spanned!(span_range.last=> { #msg } );
+                quote_spanned!(span_range.first=> compile_error!#group)
+            }
+
+            ts.extend(diag_to_tokens(
+                self.span_range,
+                &self.msg,
+                self.suggestions.as_ref(),
+            ));
+        }
+    }
+
+    impl From<syn::Error> for Diagnostic {
+        fn from(err: syn::Error) -> Self {
+            use proc_macro2::{Delimiter, TokenTree};
+
+            fn gut_error(ts: &mut impl Iterator<Item = TokenTree>) -> Option<(SpanRange, String)> {
+                let first = ts.next()?.span(); // :
+                assert_eq!(ts.next().unwrap().to_string(), ":");
+                assert_eq!(ts.next().unwrap().to_string(), "core");
+                assert_eq!(ts.next().unwrap().to_string(), ":");
+                assert_eq!(ts.next().unwrap().to_string(), ":");
+                assert_eq!(ts.next().unwrap().to_string(), "compile_error");
+                assert_eq!(ts.next().unwrap().to_string(), "!");
+
+                let lit = match ts.next().unwrap() {
+                    TokenTree::Group(group) => {
+                        // Currently `syn` builds `compile_error!` invocations
+                        // exclusively in `ident{"..."}` (braced) form which is not
+                        // followed by `;` (semicolon).
+                        //
+                        // But if it changes to `ident("...");` (parenthesized)
+                        // or `ident["..."];` (bracketed) form,
+                        // we will need to skip the `;` as well.
+                        // Highly unlikely, but better safe than sorry.
+
+                        if group.delimiter() == Delimiter::Parenthesis
+                            || group.delimiter() == Delimiter::Bracket
+                        {
+                            ts.next().unwrap(); // ;
+                        }
+
+                        match group.stream().into_iter().next().unwrap() {
+                            TokenTree::Literal(lit) => lit,
+                            tt => unreachable!("Diagnostic::gut_error(): TokenTree::Group: {tt}"),
+                        }
+                    }
+                    tt => unreachable!("Diagnostic::gut_error(): {tt}"),
+                };
+
+                let last = lit.span();
+                let mut msg = lit.to_string();
+
+                // "abc" => abc
+                msg.pop();
+                msg.remove(0);
+
+                Some((SpanRange { first, last }, msg))
+            }
+
+            let mut ts = err.to_compile_error().into_iter();
+
+            let (span_range, msg) = gut_error(&mut ts).unwrap();
+
+            Self {
+                span_range,
+                msg,
+                suggestions: vec![],
+            }
+        }
+    }
+
+    /// Emits a [`syn::Error`] while not aborting macro execution.
+    pub(crate) fn emit_error(e: syn::Error) {
+        Diagnostic::from(e).emit()
+    }
+
+    /// Range of [`Span`]s.
+    #[derive(Clone, Copy, Debug)]
+    struct SpanRange {
+        first: Span,
+        last: Span,
+    }
+
+    thread_local! {
+        static ENTERED_ENTRY_POINT: Cell<usize> = Cell::new(0);
+    }
+
+    /// This is the entry point for a macro to support [`Diagnostic`]s.
+    pub(crate) fn entry_point<F>(f: F) -> proc_macro::TokenStream
+    where
+        F: FnOnce() -> proc_macro::TokenStream + UnwindSafe,
+    {
+        ENTERED_ENTRY_POINT.with(|flag| flag.set(flag.get() + 1));
+        let caught = catch_unwind(f);
+        let err_storage = ERR_STORAGE.with(|s| s.replace(Vec::new()));
+        ENTERED_ENTRY_POINT.with(|flag| flag.set(flag.get() - 1));
+
+        let gen_error = || {
+            quote! { #( #err_storage )* }
+        };
+
+        match caught {
+            Ok(ts) => {
+                if err_storage.is_empty() {
+                    ts
+                } else {
+                    gen_error().into()
+                }
+            }
+
+            Err(boxed) => match boxed.downcast_ref::<&str>() {
+                Some(p) if *p == "diagnostic::polyfill::abort_now" => gen_error().into(),
+                _ => resume_unwind(boxed),
+            },
+        }
+    }
+
+    fn check_correctness() {
+        if ENTERED_ENTRY_POINT.get() == 0 {
+            panic!(
+                "`common::diagnostic` API cannot be used outside of `entry_point()` invocation, \
+                 perhaps you forgot to invoke it your #[proc_macro] function",
+            );
+        }
+    }
+
+    thread_local! {
+        static ERR_STORAGE: RefCell<Vec<Diagnostic>> = RefCell::new(Vec::new());
+    }
+
+    /// Emits the provided [`Diagnostic`], while not aborting macro execution.
+    fn emit_diagnostic(diag: Diagnostic) {
+        ERR_STORAGE.with(|s| s.borrow_mut().push(diag));
+    }
+
+    /// Aborts macro execution. if any [`Diagnostic`]s were emitted before.
+    pub(crate) fn abort_if_dirty() {
+        check_correctness();
+        ERR_STORAGE.with(|s| {
+            if !s.borrow().is_empty() {
+                abort_now()
+            }
+        });
+    }
+
+    fn abort_now() -> ! {
+        check_correctness();
+        panic!("diagnostic::polyfill::abort_now")
+    }
+
+    /// Extension of `Result<T, Into<Diagnostic>>` with some handy shortcuts.
+    pub(crate) trait ResultExt {
+        type Ok;
+
+        /// Behaves like [`Result::unwrap()`]: if `self` is [`Ok`] yield the contained value,
+        /// otherwise abort macro execution.
+        fn unwrap_or_abort(self) -> Self::Ok;
+
+        /// Behaves like [`Result::expect()`]: if `self` is [`Ok`] yield the contained value,
+        /// otherwise abort macro execution.
+        ///
+        /// If it aborts then resulting error message will be preceded with the provided `message`.
+        fn expect_or_abort(self, message: &str) -> Self::Ok;
+    }
+
+    impl<T, E: Into<Diagnostic>> ResultExt for Result<T, E> {
+        type Ok = T;
+
+        fn unwrap_or_abort(self) -> T {
+            self.unwrap_or_else(|e| e.into().abort())
+        }
+
+        fn expect_or_abort(self, message: &str) -> T {
+            self.unwrap_or_else(|e| {
+                let mut d = e.into();
+                d.msg = format!("{message}: {}", d.msg);
+                d.abort()
+            })
+        }
+    }
+}

juniper_codegen/src/common/field/arg.rs

@@ -374,11 +374,11 @@ impl OnMethod {
         // Remove repeated attributes from the method, to omit incorrect expansion.
         argument.attrs = mem::take(&mut argument.attrs)
             .into_iter()
-            .filter(|attr| !path_eq_single(&attr.path, "graphql"))
+            .filter(|attr| !path_eq_single(attr.path(), "graphql"))
             .collect();
 
         let attr = Attr::from_attrs("graphql", &orig_attrs)
-            .map_err(|e| proc_macro_error::emit_error!(e))
+            .map_err(diagnostic::emit_error)
             .ok()?;
 
         if attr.context.is_some() {
@@ -397,7 +397,7 @@ impl OnMethod {
             };
             if arg.is_some() {
                 attr.ensure_no_regular_arguments()
-                    .map_err(|e| scope.error(e).emit())
+                    .map_err(|e| scope.error(&e).emit())
                     .ok()?;
                 return arg;
             }

juniper_codegen/src/common/mod.rs

@@ -27,5 +27,5 @@ pub(crate) fn filter_attrs<'a>(
 ) -> impl Iterator<Item = &'a syn::Attribute> + 'a {
     attrs
         .iter()
-        .filter(move |attr| path_eq_single(&attr.path, name))
+        .filter(move |attr| path_eq_single(attr.path(), name))
 }

juniper_codegen/src/common/parse/attr.rs

@@ -28,7 +28,7 @@ pub(crate) fn unite(
 pub(crate) fn strip(attr_path: &str, attrs: Vec<syn::Attribute>) -> Vec<syn::Attribute> {
     attrs
         .into_iter()
-        .filter(|attr| !path_eq_single(&attr.path, attr_path))
+        .filter(|attr| !path_eq_single(attr.path(), attr_path))
         .collect()
 }
 

juniper_codegen/src/common/parse/downcaster.rs

@@ -65,7 +65,7 @@ pub(crate) fn output_type(ret_ty: &syn::ReturnType) -> Result<syn::Type, Span> {
 /// If input arguments are invalid, then returns the [`Span`] to display the corresponding error at.
 pub(crate) fn context_ty(sig: &syn::Signature) -> Result<Option<syn::Type>, Span> {
     match sig.receiver() {
-        Some(syn::FnArg::Receiver(rcv)) => {
+        Some(rcv) => {
             if rcv.reference.is_none() || rcv.mutability.is_some() {
                 return Err(rcv.span());
             }

juniper_codegen/src/common/parse/mod.rs

@@ -146,8 +146,13 @@ impl TypeExt for syn::Type {
                             match arg {
                                 GA::Lifetime(lt) => func(lt),
                                 GA::Type(ty) => ty.lifetimes_iter_mut(func),
-                                GA::Binding(b) => b.ty.lifetimes_iter_mut(func),
+                                GA::AssocType(a) => a.ty.lifetimes_iter_mut(func),
-                                GA::Constraint(_) | GA::Const(_) => {}
+                                GA::Constraint(_) | GA::AssocConst(_) | GA::Const(_) => {}
+                                // Following the `syn` idiom for exhaustive matching on `Type`:
+                                // https://docs.rs/syn/2.0.38/src/syn/ty.rs.html#64-79
+                                // TODO: #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
+                                //       https://github.com/rust-lang/rust/issues/89554
+                                _ => unimplemented!(),
                             }
                         }
                     }
@@ -188,6 +193,12 @@ impl TypeExt for syn::Type {
                             }
                             iter_path(&mut bound.path, func)
                         }
+                        syn::TypeParamBound::Verbatim(_) => {}
+                        // Following the `syn` idiom for exhaustive matching on `Type`:
+                        // https://docs.rs/syn/2.0.38/src/syn/ty.rs.html#64-79
+                        // TODO: #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
+                        //       https://github.com/rust-lang/rust/issues/89554
+                        _ => unimplemented!(),
                     }
                 }
             }
@@ -204,8 +215,8 @@ impl TypeExt for syn::Type {
             // These types unlikely will be used as GraphQL types.
             T::BareFn(_) | T::Infer(_) | T::Macro(_) | T::Never(_) | T::Verbatim(_) => {}
 
-            // Following the syn idiom for exhaustive matching on Type:
+            // Following the `syn` idiom for exhaustive matching on `Type`:
-            // https://github.com/dtolnay/syn/blob/1.0.90/src/ty.rs#L67-L87
+            // https://docs.rs/syn/2.0.38/src/syn/ty.rs.html#64-79
             // TODO: #[cfg_attr(test, deny(non_exhaustive_omitted_patterns))]
             //       https://github.com/rust-lang/rust/issues/89554
             _ => unimplemented!(),

juniper_codegen/src/common/scalar.rs

@@ -3,7 +3,7 @@
 //!
 //! [`ScalarValue`]: juniper::ScalarValue
 
-use proc_macro2::{Span, TokenStream};
+use proc_macro2::TokenStream;
 use quote::ToTokens;
 use syn::{
     parse::{Parse, ParseStream},
@@ -44,11 +44,11 @@ impl Parse for AttrValue {
     }
 }
 
-impl Spanned for AttrValue {
+impl ToTokens for AttrValue {
-    fn span(&self) -> Span {
+    fn to_tokens(&self, into: &mut TokenStream) {
         match self {
-            Self::Concrete(ty) => ty.span(),
+            Self::Concrete(ty) => ty.to_tokens(into),
-            Self::Generic(pred) => pred.span(),
+            Self::Generic(pred) => pred.to_tokens(into),
         }
     }
 }

juniper_codegen/src/graphql_enum/derive.rs

@@ -40,7 +40,7 @@ pub(crate) fn expand(input: TokenStream) -> syn::Result<TokenStream> {
         })
         .collect::<Vec<_>>();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if values.is_empty() {
         return Err(ERR.custom_error(
@@ -78,7 +78,7 @@ pub(crate) fn expand(input: TokenStream) -> syn::Result<TokenStream> {
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let definition = Definition {
         ident: ast.ident,
@@ -99,7 +99,7 @@ pub(crate) fn expand(input: TokenStream) -> syn::Result<TokenStream> {
 /// Returns [`None`] if the parsing fails, or the enum variant is ignored.
 fn parse_value(v: &syn::Variant, renaming: rename::Policy) -> Option<ValueDefinition> {
     let attr = VariantAttr::from_attrs("graphql", &v.attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {

juniper_codegen/src/graphql_input_object/derive.rs

@@ -36,7 +36,7 @@ pub fn expand(input: TokenStream) -> syn::Result<TokenStream> {
         .filter_map(|f| parse_field(f, renaming, is_internal))
         .collect::<Vec<_>>();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if !fields.iter().any(|f| !f.ignored) {
         return Err(ERR.custom_error(data.fields.span(), "expected at least 1 non-ignored field"));
@@ -71,7 +71,7 @@ pub fn expand(input: TokenStream) -> syn::Result<TokenStream> {
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let definition = Definition {
         ident: ast.ident,
@@ -95,7 +95,7 @@ fn parse_field(
     is_internal: bool,
 ) -> Option<FieldDefinition> {
     let field_attr = FieldAttr::from_attrs("graphql", &f.attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     let ident = f.ident.as_ref().or_else(|| err_unnamed_field(f))?;

juniper_codegen/src/graphql_interface/attr.rs

@@ -64,7 +64,7 @@ fn expand_on_trait(
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let renaming = attr
         .rename_fields
@@ -76,14 +76,14 @@ fn expand_on_trait(
         .items
         .iter_mut()
         .filter_map(|item| {
-            if let syn::TraitItem::Method(m) = item {
+            if let syn::TraitItem::Fn(m) = item {
                 return parse_trait_method(m, &renaming);
             }
             None
         })
         .collect::<Vec<_>>();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if fields.is_empty() {
         ERR.emit_custom(trait_span, "must have at least one field");
@@ -92,7 +92,7 @@ fn expand_on_trait(
         ERR.emit_custom(trait_span, "must have a different name for each field");
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let context = attr
         .context
@@ -146,7 +146,7 @@ fn expand_on_trait(
 /// Returns [`None`] if the parsing fails, or the method field is ignored.
 #[must_use]
 fn parse_trait_method(
-    method: &mut syn::TraitItemMethod,
+    method: &mut syn::TraitItemFn,
     renaming: &rename::Policy,
 ) -> Option<field::Definition> {
     let method_ident = &method.sig.ident;
@@ -155,11 +155,11 @@ fn parse_trait_method(
     // Remove repeated attributes from the method, to omit incorrect expansion.
     method.attrs = mem::take(&mut method.attrs)
         .into_iter()
-        .filter(|attr| !path_eq_single(&attr.path, "graphql"))
+        .filter(|attr| !path_eq_single(attr.path(), "graphql"))
         .collect();
 
     let attr = field::Attr::from_attrs("graphql", &method_attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {
@@ -251,7 +251,7 @@ fn expand_on_derive_input(
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let renaming = attr
         .rename_fields
@@ -265,7 +265,7 @@ fn expand_on_derive_input(
         .filter_map(|f| parse_struct_field(f, &renaming))
         .collect::<Vec<_>>();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if fields.is_empty() {
         ERR.emit_custom(struct_span, "must have at least one field");
@@ -274,7 +274,7 @@ fn expand_on_derive_input(
         ERR.emit_custom(struct_span, "must have a different name for each field");
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let context = attr
         .context
@@ -337,11 +337,11 @@ fn parse_struct_field(
     // Remove repeated attributes from the method, to omit incorrect expansion.
     field.attrs = mem::take(&mut field.attrs)
         .into_iter()
-        .filter(|attr| !path_eq_single(&attr.path, "graphql"))
+        .filter(|attr| !path_eq_single(attr.path(), "graphql"))
         .collect();
 
     let attr = field::Attr::from_attrs("graphql", &field_attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {

juniper_codegen/src/graphql_interface/derive.rs

@@ -42,7 +42,7 @@ pub fn expand(input: TokenStream) -> syn::Result<TokenStream> {
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let renaming = attr
         .rename_fields
@@ -56,7 +56,7 @@ pub fn expand(input: TokenStream) -> syn::Result<TokenStream> {
         .filter_map(|f| parse_field(f, &renaming))
         .collect::<Vec<_>>();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if fields.is_empty() {
         ERR.emit_custom(struct_span, "must have at least one field");
@@ -65,7 +65,7 @@ pub fn expand(input: TokenStream) -> syn::Result<TokenStream> {
         ERR.emit_custom(struct_span, "must have a different name for each field");
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let context = attr
         .context
@@ -118,7 +118,7 @@ fn parse_field(field: &syn::Field, renaming: &rename::Policy) -> Option<field::D
     let field_ident = field.ident.as_ref().or_else(|| err_unnamed_field(&field))?;
 
     let attr = field::Attr::from_attrs("graphql", &field.attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {

juniper_codegen/src/graphql_object/attr.rs

@@ -63,7 +63,7 @@ where
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let renaming = attr
         .rename_fields
@@ -76,7 +76,7 @@ where
         .items
         .iter_mut()
         .filter_map(|item| {
-            if let syn::ImplItem::Method(m) = item {
+            if let syn::ImplItem::Fn(m) = item {
                 parse_field(m, async_only, &renaming)
             } else {
                 None
@@ -84,7 +84,7 @@ where
         })
         .collect();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if fields.is_empty() {
         ERR.emit_custom(type_span, "must have at least one field");
@@ -93,7 +93,7 @@ where
         ERR.emit_custom(type_span, "must have a different name for each field");
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let context = attr
         .context
@@ -132,12 +132,12 @@ where
     })
 }
 
-/// Parses a [`field::Definition`] from the given Rust [`syn::ImplItemMethod`].
+/// Parses a [`field::Definition`] from the given Rust [`syn::ImplItemFn`].
 ///
 /// Returns [`None`] if parsing fails, or the method field is ignored.
 #[must_use]
 fn parse_field(
-    method: &mut syn::ImplItemMethod,
+    method: &mut syn::ImplItemFn,
     async_only: bool,
     renaming: &rename::Policy,
 ) -> Option<field::Definition> {
@@ -146,11 +146,11 @@ fn parse_field(
     // Remove repeated attributes from the method, to omit incorrect expansion.
     method.attrs = mem::take(&mut method.attrs)
         .into_iter()
-        .filter(|attr| !path_eq_single(&attr.path, "graphql"))
+        .filter(|attr| !path_eq_single(attr.path(), "graphql"))
         .collect();
 
     let attr = field::Attr::from_attrs("graphql", &method_attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {
@@ -239,7 +239,7 @@ fn err_invalid_method_receiver<T, S: Spanned>(span: &S) -> Option<T> {
 #[must_use]
 fn err_no_sync_resolvers<T, S: Spanned>(span: &S) -> Option<T> {
     ERR.custom(span.span(), "synchronous resolvers are not supported")
-        .note("Specify that this function is async: `async fn foo()`".into())
+        .note("Specify that this function is async: `async fn foo()`")
         .emit();
     None
 }

juniper_codegen/src/graphql_object/derive.rs

@@ -3,11 +3,15 @@
 use std::marker::PhantomData;
 
 use proc_macro2::TokenStream;
-use proc_macro_error::ResultExt as _;
 use quote::ToTokens;
 use syn::{ext::IdentExt as _, parse_quote, spanned::Spanned as _};
 
-use crate::common::{diagnostic, field, parse::TypeExt as _, rename, scalar, SpanContainer};
+use crate::common::{
+    diagnostic::{self, ResultExt as _},
+    field,
+    parse::TypeExt as _,
+    rename, scalar, SpanContainer,
+};
 
 use super::{Attr, Definition, Query};
 
@@ -52,7 +56,7 @@ fn expand_struct(ast: syn::DeriveInput) -> syn::Result<Definition<Query>> {
 
     let scalar = scalar::Type::parse(attr.scalar.as_deref(), &ast.generics);
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let renaming = attr
         .rename_fields
@@ -73,7 +77,7 @@ fn expand_struct(ast: syn::DeriveInput) -> syn::Result<Definition<Query>> {
         }
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     if fields.is_empty() {
         ERR.emit_custom(struct_span, "must have at least one field");
@@ -82,7 +86,7 @@ fn expand_struct(ast: syn::DeriveInput) -> syn::Result<Definition<Query>> {
         ERR.emit_custom(struct_span, "must have a different name for each field");
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     Ok(Definition {
         name,
@@ -110,7 +114,7 @@ fn expand_struct(ast: syn::DeriveInput) -> syn::Result<Definition<Query>> {
 #[must_use]
 fn parse_field(field: &syn::Field, renaming: &rename::Policy) -> Option<field::Definition> {
     let attr = field::Attr::from_attrs("graphql", &field.attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if attr.ignore.is_some() {

juniper_codegen/src/graphql_scalar/mod.rs

@@ -160,8 +160,7 @@ impl Parse for Attr {
                 "parse_token" => {
                     let types;
                     let _ = syn::parenthesized!(types in input);
-                    let parsed_types =
+                    let parsed_types = types.parse_terminated(syn::Type::parse, token::Comma)?;
-                        types.parse_terminated::<_, token::Comma>(syn::Type::parse)?;
 
                     if parsed_types.is_empty() {
                         return Err(syn::Error::new(ident.span(), "expected at least 1 type."));
@@ -187,7 +186,7 @@ impl Parse for Attr {
                         let predicates;
                         let _ = syn::parenthesized!(predicates in input);
                         let parsed_predicates = predicates
-                            .parse_terminated::<_, token::Comma>(syn::WherePredicate::parse)?;
+                            .parse_terminated(syn::WherePredicate::parse, token::Comma)?;
 
                         if parsed_predicates.is_empty() {
                             return Err(syn::Error::new(

juniper_codegen/src/graphql_union/attr.rs

@@ -58,12 +58,12 @@ fn expand_on_trait(
         .items
         .iter_mut()
         .filter_map(|i| match i {
-            syn::TraitItem::Method(m) => parse_variant_from_trait_method(m, trait_ident, &attr),
+            syn::TraitItem::Fn(m) => parse_variant_from_trait_method(m, trait_ident, &attr),
             _ => None,
         })
         .collect();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     emerge_union_variants_from_attr(&mut variants, attr.external_resolvers);
 
@@ -78,7 +78,7 @@ fn expand_on_trait(
         );
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     let context = attr
         .context
@@ -105,12 +105,12 @@ fn expand_on_trait(
 
 /// Parses given Rust trait `method` as [GraphQL union][1] variant.
 ///
-/// On failure returns [`None`] and internally fills up [`proc_macro_error`]
+/// On failure returns [`None`] and internally fills up [`diagnostic`]
 /// with the corresponding errors.
 ///
 /// [1]: https://spec.graphql.org/October2021#sec-Unions
 fn parse_variant_from_trait_method(
-    method: &mut syn::TraitItemMethod,
+    method: &mut syn::TraitItemFn,
     trait_ident: &syn::Ident,
     trait_attr: &Attr,
 ) -> Option<VariantDefinition> {
@@ -119,11 +119,11 @@ fn parse_variant_from_trait_method(
     // Remove repeated attributes from the method, to omit incorrect expansion.
     method.attrs = mem::take(&mut method.attrs)
         .into_iter()
-        .filter(|attr| !path_eq_single(&attr.path, "graphql"))
+        .filter(|attr| !path_eq_single(attr.path(), "graphql"))
         .collect();
 
     let attr = VariantAttr::from_attrs("graphql", &method_attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
 
     if let Some(rslvr) = attr.external_resolver {

juniper_codegen/src/graphql_union/derive.rs

@@ -1,11 +1,14 @@
 //! Code generation for `#[derive(GraphQLUnion)]` macro.
 
 use proc_macro2::TokenStream;
-use proc_macro_error::ResultExt as _;
 use quote::{quote, ToTokens};
 use syn::{ext::IdentExt as _, parse_quote, spanned::Spanned as _, Data, Fields};
 
-use crate::common::{diagnostic, parse::TypeExt as _, scalar, SpanContainer};
+use crate::common::{
+    diagnostic::{self, ResultExt as _},
+    parse::TypeExt as _,
+    scalar, SpanContainer,
+};
 
 use super::{
     all_variants_different, emerge_union_variants_from_attr, Attr, Definition, VariantAttr,
@@ -51,13 +54,13 @@ fn expand_enum(ast: syn::DeriveInput) -> syn::Result<Definition> {
 
     let mut variants: Vec<_> = match ast.data {
         Data::Enum(data) => data.variants,
-        _ => unreachable!(),
+        data => unreachable!("graphql_union::derive::expand_enum({data:?})"),
     }
     .into_iter()
     .filter_map(|var| parse_variant_from_enum_variant(var, &enum_ident, &attr))
     .collect();
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     emerge_union_variants_from_attr(&mut variants, attr.external_resolvers);
 
@@ -72,7 +75,7 @@ fn expand_enum(ast: syn::DeriveInput) -> syn::Result<Definition> {
         );
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     Ok(Definition {
         name,
@@ -91,7 +94,7 @@ fn expand_enum(ast: syn::DeriveInput) -> syn::Result<Definition> {
 
 /// Parses given Rust enum `var`iant as [GraphQL union][1] variant.
 ///
-/// On failure returns [`None`] and internally fills up [`proc_macro_error`]
+/// On failure returns [`None`] and internally fills up [`diagnostic`]
 /// with the corresponding errors.
 ///
 /// [1]: https://spec.graphql.org/October2021#sec-Unions
@@ -101,7 +104,7 @@ fn parse_variant_from_enum_variant(
     enum_attr: &Attr,
 ) -> Option<VariantDefinition> {
     let attr = VariantAttr::from_attrs("graphql", &var.attrs)
-        .map_err(|e| proc_macro_error::emit_error!(e))
+        .map_err(diagnostic::emit_error)
         .ok()?;
     if attr.ignore.is_some() {
         return None;
@@ -205,7 +208,7 @@ fn expand_struct(ast: syn::DeriveInput) -> syn::Result<Definition> {
         );
     }
 
-    proc_macro_error::abort_if_dirty();
+    diagnostic::abort_if_dirty();
 
     Ok(Definition {
         name,

juniper_codegen/src/lib.rs

@@ -108,7 +108,8 @@ mod graphql_union;
 mod scalar_value;
 
 use proc_macro::TokenStream;
-use proc_macro_error::{proc_macro_error, ResultExt as _};
+
+use self::common::diagnostic::{self, ResultExt as _};
 
 /// `#[derive(GraphQLInputObject)]` macro for deriving a
 /// [GraphQL input object][0] implementation for a Rust struct. Each
@@ -213,12 +214,13 @@ use proc_macro_error::{proc_macro_error, ResultExt as _};
 /// [0]: https://spec.graphql.org/October2021#sec-Input-Objects
 /// [1]: https://spec.graphql.org/October2021#InputFieldsDefinition
 /// [2]: https://spec.graphql.org/October2021#sec-Scalars
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLInputObject, attributes(graphql))]
 pub fn derive_input_object(input: TokenStream) -> TokenStream {
-    graphql_input_object::derive::expand(input.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        graphql_input_object::derive::expand(input.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(GraphQLEnum)]` macro for deriving a [GraphQL enum][0]
@@ -342,12 +344,13 @@ pub fn derive_input_object(input: TokenStream) -> TokenStream {
 /// [`ScalarValue`]: juniper::ScalarValue
 /// [0]: https://spec.graphql.org/October2021#sec-Enums
 /// [1]: https://spec.graphql.org/October2021#sec-Enum-Value
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLEnum, attributes(graphql))]
 pub fn derive_enum(input: TokenStream) -> TokenStream {
-    graphql_enum::derive::expand(input.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        graphql_enum::derive::expand(input.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(GraphQLScalar)]` macro for deriving a [GraphQL scalar][0]
@@ -654,12 +657,13 @@ pub fn derive_enum(input: TokenStream) -> TokenStream {
 /// [0]: https://spec.graphql.org/October2021#sec-Scalars
 /// [1]: https://rust-unofficial.github.io/patterns/patterns/behavioural/newtype.html
 /// [`ScalarValue`]: juniper::ScalarValue
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLScalar, attributes(graphql))]
 pub fn derive_scalar(input: TokenStream) -> TokenStream {
-    graphql_scalar::derive::expand(input.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        graphql_scalar::derive::expand(input.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[graphql_scalar]` macro.is interchangeable with
@@ -748,12 +752,13 @@ pub fn derive_scalar(input: TokenStream) -> TokenStream {
 /// [orphan rules]: https://bit.ly/3glAGC2
 /// [`GraphQLScalar`]: juniper::GraphQLScalar
 /// [`ScalarValue`]: juniper::ScalarValue
-#[proc_macro_error]
 #[proc_macro_attribute]
 pub fn graphql_scalar(attr: TokenStream, body: TokenStream) -> TokenStream {
-    graphql_scalar::attr::expand(attr.into(), body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        graphql_scalar::attr::expand(attr.into(), body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(ScalarValue)]` macro for deriving a [`ScalarValue`]
@@ -856,12 +861,13 @@ pub fn graphql_scalar(attr: TokenStream, body: TokenStream) -> TokenStream {
 /// ```
 ///
 /// [`ScalarValue`]: juniper::ScalarValue
-#[proc_macro_error]
 #[proc_macro_derive(ScalarValue, attributes(value))]
 pub fn derive_scalar_value(input: TokenStream) -> TokenStream {
-    scalar_value::expand_derive(input.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        scalar_value::expand_derive(input.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[graphql_interface]` macro for generating a [GraphQL interface][1]
@@ -1289,12 +1295,13 @@ pub fn derive_scalar_value(input: TokenStream) -> TokenStream {
 /// [2]: https://doc.rust-lang.org/stable/reference/items/traits.html#object-safety
 /// [3]: https://doc.rust-lang.org/stable/reference/types/trait-object.html
 /// [4]: https://doc.rust-lang.org/stable/std/primitive.unit.html
-#[proc_macro_error]
 #[proc_macro_attribute]
 pub fn graphql_interface(attr: TokenStream, body: TokenStream) -> TokenStream {
-    self::graphql_interface::attr::expand(attr.into(), body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_interface::attr::expand(attr.into(), body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(GraphQLInterface)]` macro for generating a [GraphQL interface][1]
@@ -1326,12 +1333,13 @@ pub fn graphql_interface(attr: TokenStream, body: TokenStream) -> TokenStream {
 ///
 /// [`#[graphql_interface]`]: crate::graphql_interface
 /// [1]: https://spec.graphql.org/October2021#sec-Interfaces
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLInterface, attributes(graphql))]
 pub fn derive_interface(body: TokenStream) -> TokenStream {
-    self::graphql_interface::derive::expand(body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_interface::derive::expand(body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(GraphQLObject)]` macro for deriving a [GraphQL object][1]
@@ -1463,12 +1471,13 @@ pub fn derive_interface(body: TokenStream) -> TokenStream {
 ///
 /// [`ScalarValue`]: juniper::ScalarValue
 /// [1]: https://spec.graphql.org/October2021#sec-Objects
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLObject, attributes(graphql))]
 pub fn derive_object(body: TokenStream) -> TokenStream {
-    self::graphql_object::derive::expand(body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_object::derive::expand(body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[graphql_object]` macro for generating a [GraphQL object][1]
@@ -1788,12 +1797,13 @@ pub fn derive_object(body: TokenStream) -> TokenStream {
 /// [`ScalarValue`]: juniper::ScalarValue
 /// [0]: https://spec.graphql.org/October2021
 /// [1]: https://spec.graphql.org/October2021#sec-Objects
-#[proc_macro_error]
 #[proc_macro_attribute]
 pub fn graphql_object(attr: TokenStream, body: TokenStream) -> TokenStream {
-    self::graphql_object::attr::expand(attr.into(), body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_object::attr::expand(attr.into(), body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[graphql_subscription]` macro for generating a [GraphQL subscription][1]
@@ -1841,12 +1851,13 @@ pub fn graphql_object(attr: TokenStream, body: TokenStream) -> TokenStream {
 /// [`GraphQLSubscriptionValue`]: juniper::GraphQLSubscriptionValue
 /// [`Stream`]: futures::Stream
 /// [1]: https://spec.graphql.org/October2021#sec-Subscription
-#[proc_macro_error]
 #[proc_macro_attribute]
 pub fn graphql_subscription(attr: TokenStream, body: TokenStream) -> TokenStream {
-    self::graphql_subscription::attr::expand(attr.into(), body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_subscription::attr::expand(attr.into(), body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[derive(GraphQLUnion)]` macro for deriving a [GraphQL union][1] implementation for enums and
@@ -2149,12 +2160,13 @@ pub fn graphql_subscription(attr: TokenStream, body: TokenStream) -> TokenStream
 /// [`ScalarValue`]: juniper::ScalarValue
 /// [1]: https://spec.graphql.org/October2021#sec-Unions
 /// [4]: https://doc.rust-lang.org/stable/std/primitive.unit.html
-#[proc_macro_error]
 #[proc_macro_derive(GraphQLUnion, attributes(graphql))]
 pub fn derive_union(body: TokenStream) -> TokenStream {
-    self::graphql_union::derive::expand(body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_union::derive::expand(body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }
 
 /// `#[graphql_union]` macro for deriving a [GraphQL union][1] implementation for traits.
@@ -2441,10 +2453,11 @@ pub fn derive_union(body: TokenStream) -> TokenStream {
 /// [2]: https://doc.rust-lang.org/stable/reference/items/traits.html#object-safety
 /// [3]: https://doc.rust-lang.org/stable/reference/types/trait-object.html
 /// [4]: https://doc.rust-lang.org/stable/std/primitive.unit.html
-#[proc_macro_error]
 #[proc_macro_attribute]
 pub fn graphql_union(attr: TokenStream, body: TokenStream) -> TokenStream {
-    self::graphql_union::attr::expand(attr.into(), body.into())
+    diagnostic::entry_point(|| {
-        .unwrap_or_abort()
+        self::graphql_union::attr::expand(attr.into(), body.into())
-        .into()
+            .unwrap_or_abort()
+            .into()
+    })
 }

juniper_graphql_ws/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_graphql_ws"
 version = "0.4.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "GraphQL over WebSocket Protocol implementations for `juniper` crate."
 license = "BSD-2-Clause"
 authors = [

juniper_graphql_ws/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_graphql_ws.svg?maxAge=2592000)](https://crates.io/crates/juniper_graphql_ws)
 [![Documentation](https://docs.rs/juniper_graphql_ws/badge.svg)](https://docs.rs/juniper_graphql_ws)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_graphql_ws/CHANGELOG.md)
 

juniper_hyper/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_hyper"
 version = "0.9.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "`juniper` GraphQL integration with `hyper`."
 license = "BSD-2-Clause"
 authors = ["Damir Vandic <info@dvic.io>"]
@@ -22,7 +22,7 @@ serde_json = "1.0.18"
 tokio = "1.0"
 url = "2.0"
 
-# Fixes for MSRV check.
+# Fixes for `minimal-versions` check.
 # TODO: Try remove on upgrade of `hyper` crate.
 http-body = "0.4.5"
 

juniper_hyper/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_hyper.svg?maxAge=2592000)](https://crates.io/crates/juniper_hyper)
 [![Documentation](https://docs.rs/juniper_hyper/badge.svg)](https://docs.rs/juniper_hyper)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_hyper/CHANGELOG.md)
 

juniper_iron/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_iron"
 version = "0.8.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "`juniper` GraphQL integration with `iron`."
 license = "BSD-2-Clause"
 authors = [

juniper_iron/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_iron.svg?maxAge=2592000)](https://crates.io/crates/juniper_iron)
 [![Documentation](https://docs.rs/juniper_iron/badge.svg)](https://docs.rs/juniper_iron)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_iron/CHANGELOG.md)
 

juniper_rocket/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_rocket"
 version = "0.9.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "`juniper` GraphQL integration with `rocket`."
 license = "BSD-2-Clause"
 authors = [
@@ -23,7 +23,7 @@ juniper = { version = "0.16.0-dev", path = "../juniper", default-features = fals
 rocket = { version = "=0.5.0-rc.3", default-features = false }
 serde_json = "1.0.18"
 
-# Fixes for MSRV check.
+# Fixes for `minimal-versions` check.
 # TODO: Try remove on upgrade of `rocket` crate.
 either = "1.8"
 inlinable_string = "0.1.15"

juniper_rocket/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_rocket.svg?maxAge=2592000)](https://crates.io/crates/juniper_rocket)
 [![Documentation](https://docs.rs/juniper_rocket/badge.svg)](https://docs.rs/juniper_rocket)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_rocket/CHANGELOG.md)
 

juniper_subscriptions/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_subscriptions"
 version = "0.17.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "Juniper `SubscriptionCoordinator` and `SubscriptionConnection` implementations."
 license = "BSD-2-Clause"
 authors = ["nWacky <gosha.evtushenko@gmail.com>"]

juniper_subscriptions/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_subscriptions.svg?maxAge=2592000)](https://crates.io/crates/juniper_subscriptions)
 [![Documentation](https://docs.rs/juniper_subscriptions/badge.svg)](https://docs.rs/juniper_subscriptions)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_subscriptions/CHANGELOG.md)
 

juniper_warp/Cargo.toml

@@ -2,7 +2,7 @@
 name = "juniper_warp"
 version = "0.8.0-dev"
 edition = "2021"
-rust-version = "1.65"
+rust-version = "1.73"
 description = "`juniper` GraphQL integration with `warp`."
 license = "BSD-2-Clause"
 authors = ["Tom Houlé <tom@tomhoule.com>"]
@@ -37,7 +37,7 @@ thiserror = "1.0"
 tokio = { version = "1.0", features = ["rt-multi-thread"] }
 warp = { version = "0.3.2", default-features = false }
 
-# Fixes for MSRV check.
+# Fixes for `minimal-versions` check.
 # TODO: Try remove on upgrade of `warp` crate.
 headers = "0.3.8"
 

juniper_warp/README.md

@@ -4,7 +4,7 @@
 [![Crates.io](https://img.shields.io/crates/v/juniper_warp.svg?maxAge=2592000)](https://crates.io/crates/juniper_warp)
 [![Documentation](https://docs.rs/juniper_warp/badge.svg)](https://docs.rs/juniper_warp)
 [![CI](https://github.com/graphql-rust/juniper/workflows/CI/badge.svg?branch=master "CI")](https://github.com/graphql-rust/juniper/actions?query=workflow%3ACI+branch%3Amaster)
-[![Rust 1.65+](https://img.shields.io/badge/rustc-1.65+-lightgray.svg "Rust 1.65+")](https://blog.rust-lang.org/2022/11/03/Rust-1.65.0.html)
+[![Rust 1.73+](https://img.shields.io/badge/rustc-1.73+-lightgray.svg "Rust 1.73+")](https://blog.rust-lang.org/2023/10/05/Rust-1.73.0.html)
 
 - [Changelog](https://github.com/graphql-rust/juniper/blob/master/juniper_warp/CHANGELOG.md)
 

tests/codegen/fail/enum/derive_duplicated_value_names.stderr

@@ -1,7 +1,5 @@
 error: GraphQL enum expected all GraphQL enum values to have unique names
  --> fail/enum/derive_duplicated_value_names.rs:5:5
   |
-5 | /     Test,
+5 |     Test,
-6 | |     #[graphql(name = "TEST")]
+  |     ^^^^
-7 | |     Test1,
-  | |__________^

tests/codegen/fail/enum/derive_name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/enum/derive_name_double_underscored.rs:4:6
   |
 4 | enum __Test {
   |      ^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/enum/derive_variant_with_field.stderr

@@ -1,7 +1,6 @@
 error: GraphQL enum no fields allowed for non-ignored variants
+       · note: https://spec.graphql.org/October2021#sec-Enums
  --> fail/enum/derive_variant_with_field.rs:5:12
   |
 5 |     Variant(i32),
   |            ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Enums

tests/codegen/fail/enum/derive_wrong_item.stderr

@@ -2,4 +2,4 @@ error: GraphQL enum can only be derived on enums
  --> fail/enum/derive_wrong_item.rs:4:1
   |
 4 | struct Test {}
-  | ^^^^^^^^^^^^^^
+  | ^^^^^^

tests/codegen/fail/input-object/derive_incompatible_field_type.stderr

@@ -1,47 +1,46 @@
 error[E0277]: the trait bound `ObjectA: IsInputType<__S>` is not satisfied
-  --> fail/input-object/derive_incompatible_field_type.rs:10:12
+ --> fail/input-object/derive_incompatible_field_type.rs:8:10
-   |
+  |
-10 |     field: ObjectA,
+8 | #[derive(GraphQLInputObject)]
-   |            ^^^^^^^ the trait `IsInputType<__S>` is not implemented for `ObjectA`
+  |          ^^^^^^^^^^^^^^^^^^ the trait `IsInputType<__S>` is not implemented for `ObjectA`
-   |
+  |
-   = help: the following other types implement trait `IsInputType<S>`:
+  = help: the following other types implement trait `IsInputType<S>`:
-             <bool as IsInputType<__S>>
+            <bool as IsInputType<__S>>
-             <i32 as IsInputType<__S>>
+            <i32 as IsInputType<__S>>
-             <f64 as IsInputType<__S>>
+            <f64 as IsInputType<__S>>
-             <Object as IsInputType<__S>>
+            <Object as IsInputType<__S>>
-             <Box<T> as IsInputType<S>>
+            <Box<T> as IsInputType<S>>
-             <uuid::Uuid as IsInputType<__S>>
+            <uuid::Uuid as IsInputType<__S>>
-             <url::Url as IsInputType<__S>>
+            <url::Url as IsInputType<__S>>
-             <bson::datetime::DateTime as IsInputType<__S>>
+            <bson::datetime::DateTime as IsInputType<__S>>
-           and $N others
+          and $N others
+  = note: this error originates in the derive macro `GraphQLInputObject` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the trait bound `ObjectA: FromInputValue<__S>` is not satisfied
-  --> fail/input-object/derive_incompatible_field_type.rs:10:12
+ --> fail/input-object/derive_incompatible_field_type.rs:8:10
-   |
+  |
-8  | #[derive(GraphQLInputObject)]
+8 | #[derive(GraphQLInputObject)]
-   |          ------------------ required by a bound introduced by this call
+  |          ^^^^^^^^^^^^^^^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjectA`
-9  | struct Object {
+  |
-10 |     field: ObjectA,
+  = help: the following other types implement trait `FromInputValue<S>`:
-   |            ^^^^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjectA`
+            <bool as FromInputValue<__S>>
-   |
+            <i32 as FromInputValue<__S>>
-   = help: the following other types implement trait `FromInputValue<S>`:
+            <f64 as FromInputValue<__S>>
-             <bool as FromInputValue<__S>>
+            <Object as FromInputValue<__S>>
-             <i32 as FromInputValue<__S>>
+            <Box<T> as FromInputValue<S>>
-             <f64 as FromInputValue<__S>>
+            <uuid::Uuid as FromInputValue<__S>>
-             <Object as FromInputValue<__S>>
+            <url::Url as FromInputValue<__S>>
-             <Box<T> as FromInputValue<S>>
+            <bson::datetime::DateTime as FromInputValue<__S>>
-             <uuid::Uuid as FromInputValue<__S>>
+          and $N others
-             <url::Url as FromInputValue<__S>>
-             <bson::datetime::DateTime as FromInputValue<__S>>
-           and $N others
 note: required by a bound in `Registry::<'r, S>::arg`
-  --> $WORKSPACE/juniper/src/executor/mod.rs
+ --> $WORKSPACE/juniper/src/executor/mod.rs
-   |
+  |
-   |     pub fn arg<T>(&mut self, name: &str, info: &T::TypeInfo) -> Argument<'r, S>
+  |     pub fn arg<T>(&mut self, name: &str, info: &T::TypeInfo) -> Argument<'r, S>
-   |            --- required by a bound in this associated function
+  |            --- required by a bound in this associated function
-   |     where
+  |     where
-   |         T: GraphQLType<S> + FromInputValue<S>,
+  |         T: GraphQLType<S> + FromInputValue<S>,
-   |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+  |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+  = note: this error originates in the derive macro `GraphQLInputObject` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the trait bound `ObjectA: FromInputValue<__S>` is not satisfied
  --> fail/input-object/derive_incompatible_field_type.rs:8:10

tests/codegen/fail/input-object/derive_no_underscore.stderr

@@ -1,8 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/input-object/derive_no_underscore.rs:5:5
   |
-5 | /     #[graphql(name = "__test")]
+5 |     #[graphql(name = "__test")]
-6 | |     test: String,
+  |     ^
-  | |________________^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/attr_wrong_item.stderr

@@ -2,4 +2,4 @@ error: GraphQL interface #[graphql_interface] attribute is applicable to trait a
  --> fail/interface/attr_wrong_item.rs:9:1
   |
 9 | enum Character {}
-  | ^^^^^^^^^^^^^^^^^
+  | ^^^^

tests/codegen/fail/interface/derive_wrong_item.stderr

@@ -1,6 +1,5 @@
 error: GraphQL interface can only be derived on structs
-  --> fail/interface/derive_wrong_item.rs:9:1
+ --> fail/interface/derive_wrong_item.rs:9:1
-   |
+  |
-9  | / #[graphql(for = ObjA)]
+9 | #[graphql(for = ObjA)]
-10 | | enum Character {}
+  | ^
-   | |_________________^

tests/codegen/fail/interface/struct/attr_field_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/struct/attr_field_double_underscored.rs:5:5
   |
 5 |     __id: String,
   |     ^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/struct/attr_field_non_output_return_type.stderr

@@ -1,16 +1,16 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
- --> fail/interface/struct/attr_field_non_output_return_type.rs:8:1
+  --> fail/interface/struct/attr_field_non_output_return_type.rs:10:9
-  |
+   |
-8 | #[graphql_interface]
+10 |     id: ObjB,
-  | ^^^^^^^^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |         ^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
-  |
+   |
-  = help: the following other types implement trait `IsOutputType<S>`:
+   = help: the following other types implement trait `IsOutputType<S>`:
-            <bool as IsOutputType<__S>>
+             <bool as IsOutputType<__S>>
-            <i32 as IsOutputType<__S>>
+             <i32 as IsOutputType<__S>>
-            <f64 as IsOutputType<__S>>
+             <f64 as IsOutputType<__S>>
-            <CharacterValueEnum as IsOutputType<__S>>
+             <CharacterValueEnum as IsOutputType<__S>>
-            <Box<T> as IsOutputType<S>>
+             <Box<T> as IsOutputType<S>>
-            <uuid::Uuid as IsOutputType<__S>>
+             <uuid::Uuid as IsOutputType<__S>>
-            <url::Url as IsOutputType<__S>>
+             <url::Url as IsOutputType<__S>>
-            <bson::datetime::DateTime as IsOutputType<__S>>
+             <bson::datetime::DateTime as IsOutputType<__S>>
-          and $N others
+           and $N others

tests/codegen/fail/interface/struct/attr_fields_duplicate.stderr

@@ -1,12 +1,6 @@
 error: GraphQL interface must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/attr_fields_duplicate.rs:4:1
   |
-4 | / struct Character {
+4 | struct Character {
-5 | |     id: String,
+  | ^^^^^^
-6 | |
-7 | |     #[graphql(name = "id")]
-8 | |     id2: String,
-9 | | }
-  | |_^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/struct/attr_missing_field.stderr

@@ -13,27 +13,3 @@ error[E0080]: evaluation of constant value failed
    |     ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/struct/attr_missing_field.rs:11:5
    |
    = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0080]: evaluation of constant value failed
-  --> fail/interface/struct/attr_missing_field.rs:11:5
-   |
-11 |     id: String,
-   |     ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/struct/attr_missing_field.rs:11:5
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0277]: the trait bound `ObjA: reflect::Field<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/struct/attr_missing_field.rs:11:5
-   |
-11 |     id: String,
-   |     ^^ the trait `reflect::Field<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `reflect::Field<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`
-
-error[E0277]: the trait bound `ObjA: AsyncField<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/struct/attr_missing_field.rs:11:5
-   |
-11 |     id: String,
-   |     ^^ the trait `AsyncField<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `AsyncField<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`

tests/codegen/fail/interface/struct/attr_name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/struct/attr_name_double_underscored.rs:4:8
   |
 4 | struct __Character {
   |        ^^^^^^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/struct/attr_no_fields.stderr

@@ -1,7 +1,6 @@
 error: GraphQL interface must have at least one field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/attr_no_fields.rs:4:1
   |
 4 | struct Character {}
-  | ^^^^^^^^^^^^^^^^^^^
+  | ^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/struct/attr_unnamed_field.stderr

@@ -1,7 +1,6 @@
 error: GraphQL interface expected named struct field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/attr_unnamed_field.rs:4:18
   |
 4 | struct Character(i32);
   |                  ^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/struct/derive_field_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/struct/derive_field_double_underscored.rs:5:5
   |
 5 |     __id: String,
   |     ^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/struct/derive_field_non_output_return_type.stderr

@@ -1,16 +1,16 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
- --> fail/interface/struct/derive_field_non_output_return_type.rs:8:10
+  --> fail/interface/struct/derive_field_non_output_return_type.rs:10:9
-  |
+   |
-8 | #[derive(GraphQLInterface)]
+10 |     id: ObjB,
-  |          ^^^^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |         ^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
-  |
+   |
-  = help: the following other types implement trait `IsOutputType<S>`:
+   = help: the following other types implement trait `IsOutputType<S>`:
-            <bool as IsOutputType<__S>>
+             <bool as IsOutputType<__S>>
-            <i32 as IsOutputType<__S>>
+             <i32 as IsOutputType<__S>>
-            <f64 as IsOutputType<__S>>
+             <f64 as IsOutputType<__S>>
-            <CharacterValueEnum as IsOutputType<__S>>
+             <CharacterValueEnum as IsOutputType<__S>>
-            <Box<T> as IsOutputType<S>>
+             <Box<T> as IsOutputType<S>>
-            <uuid::Uuid as IsOutputType<__S>>
+             <uuid::Uuid as IsOutputType<__S>>
-            <url::Url as IsOutputType<__S>>
+             <url::Url as IsOutputType<__S>>
-            <bson::datetime::DateTime as IsOutputType<__S>>
+             <bson::datetime::DateTime as IsOutputType<__S>>
-          and $N others
+           and $N others

tests/codegen/fail/interface/struct/derive_fields_duplicate.stderr

@@ -1,12 +1,6 @@
 error: GraphQL interface must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/derive_fields_duplicate.rs:4:1
   |
-4 | / struct Character {
+4 | struct Character {
-5 | |     id: String,
+  | ^^^^^^
-6 | |
-7 | |     #[graphql(name = "id")]
-8 | |     id2: String,
-9 | | }
-  | |_^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/struct/derive_missing_field.stderr

@@ -13,27 +13,3 @@ error[E0080]: evaluation of constant value failed
    |     ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/struct/derive_missing_field.rs:12:5
    |
    = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0080]: evaluation of constant value failed
-  --> fail/interface/struct/derive_missing_field.rs:12:5
-   |
-12 |     id: String,
-   |     ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/struct/derive_missing_field.rs:12:5
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0277]: the trait bound `ObjA: reflect::Field<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/struct/derive_missing_field.rs:12:5
-   |
-12 |     id: String,
-   |     ^^ the trait `reflect::Field<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `reflect::Field<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`
-
-error[E0277]: the trait bound `ObjA: AsyncField<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/struct/derive_missing_field.rs:12:5
-   |
-12 |     id: String,
-   |     ^^ the trait `AsyncField<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `AsyncField<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`

tests/codegen/fail/interface/struct/derive_name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/struct/derive_name_double_underscored.rs:4:8
   |
 4 | struct __Character {
   |        ^^^^^^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/struct/derive_no_fields.stderr

@@ -1,7 +1,6 @@
 error: GraphQL interface must have at least one field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/derive_no_fields.rs:4:1
   |
 4 | struct Character {}
-  | ^^^^^^^^^^^^^^^^^^^
+  | ^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/struct/derive_unnamed_field.stderr

@@ -1,7 +1,6 @@
 error: GraphQL interface expected named struct field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/struct/derive_unnamed_field.rs:4:18
   |
 4 | struct Character(i32);
   |                  ^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/trait/argument_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/trait/argument_double_underscored.rs:5:18
   |
 5 |     fn id(&self, __num: i32) -> &str;
   |                  ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/trait/argument_non_input_type.stderr

@@ -16,29 +16,27 @@ error[E0277]: the trait bound `ObjA: IsInputType<__S>` is not satisfied
            and $N others
 
 error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
-  --> fail/interface/trait/argument_non_input_type.rs:10:23
+ --> fail/interface/trait/argument_non_input_type.rs:8:1
-   |
+  |
-8  | #[graphql_interface]
+8 | #[graphql_interface]
-   | -------------------- required by a bound introduced by this call
+  | ^^^^^^^^^^^^^^^^^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
-9  | trait Character {
+  |
-10 |     fn id(&self, obj: ObjA) -> &str;
+  = help: the following other types implement trait `FromInputValue<S>`:
-   |                       ^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
+            <bool as FromInputValue<__S>>
-   |
+            <i32 as FromInputValue<__S>>
-   = help: the following other types implement trait `FromInputValue<S>`:
+            <f64 as FromInputValue<__S>>
-             <bool as FromInputValue<__S>>
+            <Box<T> as FromInputValue<S>>
-             <i32 as FromInputValue<__S>>
+            <uuid::Uuid as FromInputValue<__S>>
-             <f64 as FromInputValue<__S>>
+            <url::Url as FromInputValue<__S>>
-             <Box<T> as FromInputValue<S>>
+            <bson::datetime::DateTime as FromInputValue<__S>>
-             <uuid::Uuid as FromInputValue<__S>>
+            <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
-             <url::Url as FromInputValue<__S>>
+          and $N others
-             <bson::datetime::DateTime as FromInputValue<__S>>
-             <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
-           and $N others
 note: required by a bound in `Registry::<'r, S>::arg`
-  --> $WORKSPACE/juniper/src/executor/mod.rs
+ --> $WORKSPACE/juniper/src/executor/mod.rs
-   |
+  |
-   |     pub fn arg<T>(&mut self, name: &str, info: &T::TypeInfo) -> Argument<'r, S>
+  |     pub fn arg<T>(&mut self, name: &str, info: &T::TypeInfo) -> Argument<'r, S>
-   |            --- required by a bound in this associated function
+  |            --- required by a bound in this associated function
-   |     where
+  |     where
-   |         T: GraphQLType<S> + FromInputValue<S>,
+  |         T: GraphQLType<S> + FromInputValue<S>,
-   |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+  |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+  = note: this error originates in the attribute macro `graphql_interface` (in Nightly builds, run with -Z macro-backtrace for more info)

tests/codegen/fail/interface/trait/field_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/trait/field_double_underscored.rs:5:8
   |
 5 |     fn __id(&self) -> &str;
   |        ^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/trait/field_non_output_return_type.stderr

@@ -1,16 +1,16 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
- --> fail/interface/trait/field_non_output_return_type.rs:8:1
+  --> fail/interface/trait/field_non_output_return_type.rs:10:21
-  |
+   |
-8 | #[graphql_interface]
+10 |     fn id(&self) -> ObjB;
-  | ^^^^^^^^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |                     ^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
-  |
+   |
-  = help: the following other types implement trait `IsOutputType<S>`:
+   = help: the following other types implement trait `IsOutputType<S>`:
-            <bool as IsOutputType<__S>>
+             <bool as IsOutputType<__S>>
-            <i32 as IsOutputType<__S>>
+             <i32 as IsOutputType<__S>>
-            <f64 as IsOutputType<__S>>
+             <f64 as IsOutputType<__S>>
-            <CharacterValueEnum as IsOutputType<__S>>
+             <CharacterValueEnum as IsOutputType<__S>>
-            <Box<T> as IsOutputType<S>>
+             <Box<T> as IsOutputType<S>>
-            <uuid::Uuid as IsOutputType<__S>>
+             <uuid::Uuid as IsOutputType<__S>>
-            <url::Url as IsOutputType<__S>>
+             <url::Url as IsOutputType<__S>>
-            <bson::datetime::DateTime as IsOutputType<__S>>
+             <bson::datetime::DateTime as IsOutputType<__S>>
-          and $N others
+           and $N others

tests/codegen/fail/interface/trait/fields_duplicate.stderr

@@ -1,12 +1,6 @@
 error: GraphQL interface must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/trait/fields_duplicate.rs:4:1
   |
-4 | / trait Character {
+4 | trait Character {
-5 | |     fn id(&self) -> &str;
+  | ^^^^^
-6 | |
-7 | |     #[graphql(name = "id")]
-8 | |     fn id2(&self) -> &str;
-9 | | }
-  | |_^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/trait/method_default_impl.stderr

@@ -1,4 +1,5 @@
 error: GraphQL interface trait method can't have default implementation
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/trait/method_default_impl.rs:5:26
   |
 5 |       fn id(&self) -> &str {
@@ -6,5 +7,3 @@ error: GraphQL interface trait method can't have default implementation
 6 | |         "default"
 7 | |     }
   | |_____^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/interface/trait/missing_field.stderr

@@ -13,27 +13,3 @@ error[E0080]: evaluation of constant value failed
    |        ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/trait/missing_field.rs:11:8
    |
    = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0080]: evaluation of constant value failed
-  --> fail/interface/trait/missing_field.rs:11:8
-   |
-11 |     fn id(&self) -> &str;
-   |        ^^ the evaluated program panicked at 'Failed to implement interface `Character` on `ObjA`: Field `id` isn't implemented on `ObjA`.', $DIR/fail/interface/trait/missing_field.rs:11:8
-   |
-   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `::juniper::assert_field` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0277]: the trait bound `ObjA: reflect::Field<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/trait/missing_field.rs:11:8
-   |
-11 |     fn id(&self) -> &str;
-   |        ^^ the trait `reflect::Field<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `reflect::Field<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`
-
-error[E0277]: the trait bound `ObjA: AsyncField<__S, 11301463986558097276003903130001171064>` is not satisfied
-  --> fail/interface/trait/missing_field.rs:11:8
-   |
-11 |     fn id(&self) -> &str;
-   |        ^^ the trait `AsyncField<__S, 11301463986558097276003903130001171064>` is not implemented for `ObjA`
-   |
-   = help: the trait `AsyncField<__S, 140650918148392961738240285796466530725>` is implemented for `ObjA`

tests/codegen/fail/interface/trait/name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/interface/trait/name_double_underscored.rs:4:7
   |
 4 | trait __Character {
   |       ^^^^^^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/interface/trait/no_fields.stderr

@@ -1,7 +1,6 @@
 error: GraphQL interface must have at least one field
+       · note: https://spec.graphql.org/October2021#sec-Interfaces
  --> fail/interface/trait/no_fields.rs:4:1
   |
 4 | trait Character {}
-  | ^^^^^^^^^^^^^^^^^^
+  | ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Interfaces

tests/codegen/fail/object/argument_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/object/argument_double_underscored.rs:7:18
   |
 7 |     fn id(&self, __num: i32) -> &str {
   |                  ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/object/argument_non_input_type.stderr

@@ -16,13 +16,10 @@ error[E0277]: the trait bound `ObjA: IsInputType<__S>` is not satisfied
            and $N others
 
 error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
-  --> fail/object/argument_non_input_type.rs:12:23
+  --> fail/object/argument_non_input_type.rs:10:1
    |
 10 | #[graphql_object]
-   | ----------------- required by a bound introduced by this call
+   | ^^^^^^^^^^^^^^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
-11 | impl ObjB {
-12 |     fn id(&self, obj: ObjA) -> &str {
-   |                       ^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
    |
    = help: the following other types implement trait `FromInputValue<S>`:
              <bool as FromInputValue<__S>>
@@ -42,6 +39,7 @@ note: required by a bound in `Registry::<'r, S>::arg`
    |     where
    |         T: GraphQLType<S> + FromInputValue<S>,
    |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+   = note: this error originates in the attribute macro `graphql_object` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
   --> fail/object/argument_non_input_type.rs:10:1
@@ -60,20 +58,3 @@ error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
              <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
            and $N others
    = note: this error originates in the attribute macro `graphql_object` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
-  --> fail/object/argument_non_input_type.rs:12:23
-   |
-12 |     fn id(&self, obj: ObjA) -> &str {
-   |                       ^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
-   |
-   = help: the following other types implement trait `FromInputValue<S>`:
-             <bool as FromInputValue<__S>>
-             <i32 as FromInputValue<__S>>
-             <f64 as FromInputValue<__S>>
-             <Box<T> as FromInputValue<S>>
-             <uuid::Uuid as FromInputValue<__S>>
-             <url::Url as FromInputValue<__S>>
-             <bson::datetime::DateTime as FromInputValue<__S>>
-             <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
-           and $N others

tests/codegen/fail/object/attr_field_double_underscored.stderr

@@ -1,5 +1,5 @@
 error: #[graphql_object] attribute is applicable to non-trait `impl` blocks only
- --> $DIR/attr_field_double_underscored.rs:5:1
+ --> fail/object/attr_field_double_underscored.rs:5:1
   |
 5 | #[graphql_object]
   | ^^^^^^^^^^^^^^^^^

tests/codegen/fail/object/attr_field_non_output_return_type.stderr

@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
-  --> fail/object/attr_field_non_output_return_type.rs:10:1
+  --> fail/object/attr_field_non_output_return_type.rs:12:21
    |
-10 | #[graphql_object]
+12 |     fn id(&self) -> ObjB {
-   | ^^^^^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |                     ^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
    |
    = help: the following other types implement trait `IsOutputType<S>`:
              <bool as IsOutputType<__S>>

tests/codegen/fail/object/attr_fields_duplicate.stderr

@@ -1,7 +1,6 @@
 error: GraphQL object must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Objects
  --> fail/object/attr_fields_duplicate.rs:6:6
   |
 6 | impl ObjA {
   |      ^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Objects

tests/codegen/fail/object/attr_name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/object/attr_name_double_underscored.rs:6:6
   |
 6 | impl __Obj {
   |      ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/object/attr_no_fields.stderr

@@ -1,7 +1,6 @@
 error: GraphQL object must have at least one field
+       · note: https://spec.graphql.org/October2021#sec-Objects
  --> fail/object/attr_no_fields.rs:6:6
   |
 6 | impl Obj {}
   |      ^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Objects

tests/codegen/fail/object/attr_wrong_item.stderr

@@ -1,5 +1,5 @@
 error: #[graphql_object] attribute is applicable to non-trait `impl` blocks only
- --> $DIR/attr_wrong_item.rs:3:1
+ --> fail/object/attr_wrong_item.rs:3:1
   |
 3 | #[graphql_object]
   | ^^^^^^^^^^^^^^^^^

tests/codegen/fail/object/derive_field_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/object/derive_field_double_underscored.rs:5:5
   |
 5 |     __test: String,
   |     ^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/object/derive_field_non_output_return_type.stderr

@@ -1,16 +1,16 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
- --> fail/object/derive_field_non_output_return_type.rs:8:10
+  --> fail/object/derive_field_non_output_return_type.rs:10:9
-  |
+   |
-8 | #[derive(GraphQLObject)]
+10 |     id: ObjB,
-  |          ^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |         ^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
-  |
+   |
-  = help: the following other types implement trait `IsOutputType<S>`:
+   = help: the following other types implement trait `IsOutputType<S>`:
-            <bool as IsOutputType<__S>>
+             <bool as IsOutputType<__S>>
-            <i32 as IsOutputType<__S>>
+             <i32 as IsOutputType<__S>>
-            <f64 as IsOutputType<__S>>
+             <f64 as IsOutputType<__S>>
-            <ObjA as IsOutputType<__S>>
+             <ObjA as IsOutputType<__S>>
-            <Box<T> as IsOutputType<S>>
+             <Box<T> as IsOutputType<S>>
-            <uuid::Uuid as IsOutputType<__S>>
+             <uuid::Uuid as IsOutputType<__S>>
-            <url::Url as IsOutputType<__S>>
+             <url::Url as IsOutputType<__S>>
-            <bson::datetime::DateTime as IsOutputType<__S>>
+             <bson::datetime::DateTime as IsOutputType<__S>>
-          and $N others
+           and $N others

tests/codegen/fail/object/derive_fields_duplicate.stderr

@@ -1,11 +1,6 @@
 error: GraphQL object must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Objects
  --> fail/object/derive_fields_duplicate.rs:4:1
   |
-4 | / struct ObjA {
+4 | struct ObjA {
-5 | |     id: String,
+  | ^^^^^^
-6 | |     #[graphql(name = "id")]
-7 | |     id2: String,
-8 | | }
-  | |_^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Objects

tests/codegen/fail/object/derive_name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
  --> fail/object/derive_name_double_underscored.rs:4:8
   |
 4 | struct __Obj {
   |        ^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/object/derive_no_fields.stderr

@@ -1,7 +1,6 @@
 error: GraphQL object must have at least one field
+       · note: https://spec.graphql.org/October2021#sec-Objects
  --> fail/object/derive_no_fields.rs:4:1
   |
 4 | struct Obj {}
-  | ^^^^^^^^^^^^^
+  | ^^^^^^
-  |
-  = note: https://spec.graphql.org/October2021#sec-Objects

tests/codegen/fail/object/derive_wrong_item.stderr

@@ -2,4 +2,4 @@ error: GraphQL object can only be derived for structs
  --> fail/object/derive_wrong_item.rs:4:1
   |
 4 | enum Character {}
-  | ^^^^^^^^^^^^^^^^^
+  | ^^^^

tests/codegen/fail/scalar/derive_input/attr_transparent_multiple_named_fields.stderr

@@ -1,8 +1,5 @@
 error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/attr_transparent_multiple_named_fields.rs:4:1
   |
-4 | / struct Scalar {
+4 | struct Scalar {
-5 | |     id: i32,
+  | ^^^^^^
-6 | |     another: i32,
-7 | | }
-  | |_^

tests/codegen/fail/scalar/derive_input/attr_transparent_multiple_unnamed_fields.stderr

@@ -2,4 +2,4 @@ error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/attr_transparent_multiple_unnamed_fields.rs:4:1
   |
 4 | struct Scalar(i32, i32);
-  | ^^^^^^^^^^^^^^^^^^^^^^^^
+  | ^^^^^^

tests/codegen/fail/scalar/derive_input/attr_transparent_unit_struct.stderr

@@ -2,4 +2,4 @@ error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/attr_transparent_unit_struct.rs:4:1
   |
 4 | struct ScalarSpecifiedByUrl;
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  | ^^^^^^

tests/codegen/fail/scalar/derive_input/derive_transparent_multiple_named_fields.stderr

@@ -1,9 +1,5 @@
 error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/derive_transparent_multiple_named_fields.rs:4:1
   |
-4 | / #[graphql(transparent)]
+4 | #[graphql(transparent)]
-5 | | struct Scalar {
+  | ^
-6 | |     id: i32,
-7 | |     another: i32,
-8 | | }
-  | |_^

tests/codegen/fail/scalar/derive_input/derive_transparent_multiple_unnamed_fields.stderr

@@ -1,6 +1,5 @@
 error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/derive_transparent_multiple_unnamed_fields.rs:4:1
   |
-4 | / #[graphql(transparent)]
+4 | #[graphql(transparent)]
-5 | | struct Scalar(i32, i32);
+  | ^
-  | |________________________^

tests/codegen/fail/scalar/derive_input/derive_transparent_unit_struct.stderr

@@ -1,6 +1,5 @@
 error: GraphQL scalar `transparent` attribute argument requires exactly 1 field
  --> fail/scalar/derive_input/derive_transparent_unit_struct.rs:4:1
   |
-4 | / #[graphql(transparent)]
+4 | #[graphql(transparent)]
-5 | | struct ScalarSpecifiedByUrl;
+  | ^
-  | |____________________________^

tests/codegen/fail/scalar/type_alias/attr_with_not_all_resolvers.stderr

@@ -2,4 +2,4 @@ error: GraphQL scalar all the resolvers have to be provided via `with` attribute
  --> fail/scalar/type_alias/attr_with_not_all_resolvers.rs:6:1
   |
 6 | type CustomScalar = Scalar;
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  | ^^^^

tests/codegen/fail/scalar/type_alias/attr_without_resolvers.stderr

@@ -2,4 +2,4 @@ error: GraphQL scalar all the resolvers have to be provided via `with` attribute
  --> fail/scalar/type_alias/attr_without_resolvers.rs:6:1
   |
 6 | type CustomScalar = Scalar;
-  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  | ^^^^

tests/codegen/fail/scalar_value/missing_attributes.stderr

@@ -1,11 +1,5 @@
 error: GraphQL built-in scalars missing `#[value(as_int, as_float)]` attributes. In case you are sure that it's ok, use `#[value(allow_missing_attributes)]` to suppress this error.
-  --> fail/scalar_value/missing_attributes.rs:4:1
+ --> fail/scalar_value/missing_attributes.rs:4:1
-   |
+  |
-4  | / pub enum DefaultScalarValue {
+4 | pub enum DefaultScalarValue {
-5  | |     Int(i32),
+  | ^^^
-6  | |     Float(f64),
-7  | |     #[value(as_str, as_string, into_string)]
-...  |
-10 | |     Boolean(bool),
-11 | | }
-   | |_^

tests/codegen/fail/scalar_value/not_enum.stderr

@@ -2,4 +2,4 @@ error: GraphQL built-in scalars can only be derived for enums
  --> fail/scalar_value/not_enum.rs:2:1
   |
 2 | struct ScalarValue;
-  | ^^^^^^^^^^^^^^^^^^^
+  | ^^^^^^

tests/codegen/fail/subscription/argument_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
   --> fail/subscription/argument_double_underscored.rs:11:24
    |
 11 |     async fn id(&self, __num: i32) -> Stream<'static, &'static str> {
    |                        ^^^^^
-   |
-   = note: https://spec.graphql.org/October2021#sec-Schema

tests/codegen/fail/subscription/argument_non_input_type.stderr

@@ -24,13 +24,10 @@ error[E0277]: the trait bound `ObjA: IsInputType<__S>` is not satisfied
            and $N others
 
 error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
-  --> fail/subscription/argument_non_input_type.rs:17:29
+  --> fail/subscription/argument_non_input_type.rs:15:1
    |
 15 | #[graphql_subscription]
-   | ----------------------- required by a bound introduced by this call
+   | ^^^^^^^^^^^^^^^^^^^^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
-16 | impl ObjB {
-17 |     async fn id(&self, obj: ObjA) -> Stream<'static, &'static str> {
-   |                             ^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
    |
    = help: the following other types implement trait `FromInputValue<S>`:
              <bool as FromInputValue<__S>>
@@ -50,6 +47,7 @@ note: required by a bound in `Registry::<'r, S>::arg`
    |     where
    |         T: GraphQLType<S> + FromInputValue<S>,
    |                             ^^^^^^^^^^^^^^^^^ required by this bound in `Registry::<'r, S>::arg`
+   = note: this error originates in the attribute macro `graphql_subscription` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
   --> fail/subscription/argument_non_input_type.rs:15:1
@@ -68,20 +66,3 @@ error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
              <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
            and $N others
    = note: this error originates in the attribute macro `graphql_subscription` (in Nightly builds, run with -Z macro-backtrace for more info)
-
-error[E0277]: the trait bound `ObjA: FromInputValue<__S>` is not satisfied
-  --> fail/subscription/argument_non_input_type.rs:17:29
-   |
-17 |     async fn id(&self, obj: ObjA) -> Stream<'static, &'static str> {
-   |                             ^^^^ the trait `FromInputValue<__S>` is not implemented for `ObjA`
-   |
-   = help: the following other types implement trait `FromInputValue<S>`:
-             <bool as FromInputValue<__S>>
-             <i32 as FromInputValue<__S>>
-             <f64 as FromInputValue<__S>>
-             <Box<T> as FromInputValue<S>>
-             <uuid::Uuid as FromInputValue<__S>>
-             <url::Url as FromInputValue<__S>>
-             <bson::datetime::DateTime as FromInputValue<__S>>
-             <juniper::schema::model::DirectiveLocation as FromInputValue<__S>>
-           and $N others

tests/codegen/fail/subscription/field_double_underscored.stderr

@@ -1,5 +1,5 @@
 error: #[graphql_subscription] attribute is applicable to non-trait `impl` blocks only
- --> $DIR/field_double_underscored.rs:9:1
+ --> fail/subscription/field_double_underscored.rs:9:1
   |
 9 | #[graphql_subscription]
   | ^^^^^^^^^^^^^^^^^^^^^^^

tests/codegen/fail/subscription/field_non_output_return_type.stderr

@@ -1,8 +1,8 @@
 error[E0277]: the trait bound `ObjB: IsOutputType<__S>` is not satisfied
-  --> fail/subscription/field_non_output_return_type.rs:15:1
+  --> fail/subscription/field_non_output_return_type.rs:17:27
    |
-15 | #[graphql_subscription]
+17 |     async fn id(&self) -> Stream<'static, ObjB> {
-   | ^^^^^^^^^^^^^^^^^^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
+   |                           ^^^^^^ the trait `IsOutputType<__S>` is not implemented for `ObjB`
    |
    = help: the following other types implement trait `IsOutputType<S>`:
              <bool as IsOutputType<__S>>

tests/codegen/fail/subscription/field_not_async.stderr

@@ -1,8 +1,7 @@
 error: GraphQL object synchronous resolvers are not supported
+       · note: https://spec.graphql.org/October2021#sec-Objects
+       · note: Specify that this function is async: `async fn foo()`
   --> fail/subscription/field_not_async.rs:11:5
    |
 11 |     fn id(&self) -> Stream<'static, bool> {
-   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |     ^^
-   |
-   = note: https://spec.graphql.org/October2021#sec-Objects
-   = note: Specify that this function is async: `async fn foo()`

tests/codegen/fail/subscription/fields_duplicate.stderr

@@ -1,7 +1,6 @@
 error: GraphQL object must have a different name for each field
+       · note: https://spec.graphql.org/October2021#sec-Objects
   --> fail/subscription/fields_duplicate.rs:10:6
    |
 10 | impl ObjA {
    |      ^^^^
-   |
-   = note: https://spec.graphql.org/October2021#sec-Objects

tests/codegen/fail/subscription/name_double_underscored.stderr

@@ -1,7 +1,6 @@
 error: All types and directives defined within a schema must not have a name which begins with `__` (two underscores), as this is used exclusively by GraphQL’s introspection system.
+       · note: https://spec.graphql.org/October2021#sec-Schema
   --> fail/subscription/name_double_underscored.rs:10:6
    |
 10 | impl __Obj {
    |      ^^^^^
-   |
-   = note: https://spec.graphql.org/October2021#sec-Schema