From 824cd4081bd67ee93ba42a548b84d11b151a1215 Mon Sep 17 00:00:00 2001
From: Graeme Coupar <grambo@grambo.me.uk>
Date: Tue, 26 Jan 2021 17:41:03 +0000
Subject: [PATCH] Update juniper_codegen for syn 1.0.60 (#861)

* Update juniper_codegen for syn 1.0.60

syn 1.0.60 has updated it's `Type::__Nonexhaustive` to
`Type::TestExhaustive`, breaking juniper.  This updates juniper to use
the recommended idiom for doing exhaustive matching on `Type`, which
fixes this.

Not entirely clear if we need exhaustive matching here or if we could
just use a fallback, but this fixes the build at least.

Also updated the minimum syn so users have to pull it in

* Update example to use relative deps

As otherwise CI fails on this branch
---
 examples/basic_subscriptions/Cargo.toml |  4 ++--
 examples/warp_async/Cargo.toml          |  4 ++--
 juniper_codegen/Cargo.toml              |  2 +-
 juniper_codegen/src/common/parse/mod.rs | 15 +++++++++------
 4 files changed, 14 insertions(+), 11 deletions(-)

diff --git a/examples/basic_subscriptions/Cargo.toml b/examples/basic_subscriptions/Cargo.toml
index 26877d70..bb5016e2 100644
--- a/examples/basic_subscriptions/Cargo.toml
+++ b/examples/basic_subscriptions/Cargo.toml
@@ -13,5 +13,5 @@ serde = { version = "1.0", features = ["derive"] }
 serde_json = "1.0"
 tokio = { version = "0.2", features = ["rt-core", "macros", "stream"] }
 
-juniper = { git = "https://github.com/graphql-rust/juniper" }
-juniper_subscriptions = { git = "https://github.com/graphql-rust/juniper" }
+juniper = { path = "../../juniper" }
+juniper_subscriptions = { path = "../../juniper_subscriptions" }
diff --git a/examples/warp_async/Cargo.toml b/examples/warp_async/Cargo.toml
index 31f96c3b..ce37b750 100644
--- a/examples/warp_async/Cargo.toml
+++ b/examples/warp_async/Cargo.toml
@@ -6,8 +6,8 @@ publish = false
 authors = ["Christoph Herzog <chris@theduke.at>"]
 
 [dependencies]
-juniper = { git = "https://github.com/graphql-rust/juniper" }
-juniper_warp = { git = "https://github.com/graphql-rust/juniper" }
+juniper = { path = "../../juniper" }
+juniper_warp = { path = "../../juniper_warp" }
 
 env_logger = "0.8.1"
 futures = "0.3.1"
diff --git a/juniper_codegen/Cargo.toml b/juniper_codegen/Cargo.toml
index 6bb2ef43..b84866c0 100644
--- a/juniper_codegen/Cargo.toml
+++ b/juniper_codegen/Cargo.toml
@@ -21,7 +21,7 @@ proc-macro = true
 proc-macro-error = "1.0.2"
 proc-macro2 = "1.0.1"
 quote = "1.0.3"
-syn = { version = "1.0.3", features = ["extra-traits", "full", "parsing"], default-features = false }
+syn = { version = "1.0.60", features = ["extra-traits", "full", "parsing"], default-features = false }
 
 [dev-dependencies]
 derive_more = "0.99.7"
diff --git a/juniper_codegen/src/common/parse/mod.rs b/juniper_codegen/src/common/parse/mod.rs
index fce5f0cf..c3ec54f7 100644
--- a/juniper_codegen/src/common/parse/mod.rs
+++ b/juniper_codegen/src/common/parse/mod.rs
@@ -191,12 +191,15 @@ impl TypeExt for syn::Type {
             }
 
             // These types unlikely will be used as GraphQL types.
-            T::BareFn(_)
-            | T::Infer(_)
-            | T::Macro(_)
-            | T::Never(_)
-            | T::Verbatim(_)
-            | T::__Nonexhaustive => {}
+            T::BareFn(_) | T::Infer(_) | T::Macro(_) | T::Never(_) | T::Verbatim(_) => {}
+
+            // Following the syn idiom for exhaustive matching on Type
+            // https://github.com/dtolnay/syn/blob/master/src/ty.rs#L66-L88
+            #[cfg(test)]
+            T::__TestExhaustive(_) => unimplemented!(),
+
+            #[cfg(not(test))]
+            _ => {}
         }
     }
 }