diff --git a/juniper/src/ast.rs b/juniper/src/ast.rs
index 37f95821..cbcb0091 100644
--- a/juniper/src/ast.rs
+++ b/juniper/src/ast.rs
@@ -353,7 +353,7 @@ where
     }
 
     /// View the underlying string value, if present.
-    pub fn as_string_value<'a>(&'a self) -> Option<&'a str> {
+    pub fn as_string_value(&self) -> Option<&str> {
         self.as_scalar_value().and_then(|s| s.as_str())
     }
 
diff --git a/juniper/src/executor/mod.rs b/juniper/src/executor/mod.rs
index ad94b360..cb5593b3 100644
--- a/juniper/src/executor/mod.rs
+++ b/juniper/src/executor/mod.rs
@@ -620,7 +620,7 @@ where
         self.field_path.construct_path(&mut path);
 
         ExecutionError {
-            location: self.location().clone(),
+            location: *self.location(),
             path,
             error,
         }
diff --git a/juniper/src/schema/model.rs b/juniper/src/schema/model.rs
index 6e87bee9..9eb74767 100644
--- a/juniper/src/schema/model.rs
+++ b/juniper/src/schema/model.rs
@@ -139,6 +139,7 @@ where
 }
 
 impl<'a, S> SchemaType<'a, S> {
+    /// Create a new schema.
     pub fn new<QueryT, MutationT, SubscriptionT>(
         query_info: &QueryT::TypeInfo,
         mutation_info: &MutationT::TypeInfo,
@@ -218,14 +219,17 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// Add a directive like `skip` or `include`.
     pub fn add_directive(&mut self, directive: DirectiveType<'a, S>) {
         self.directives.insert(directive.name.clone(), directive);
     }
 
+    /// Get a type by name.
     pub fn type_by_name(&self, name: &str) -> Option<TypeType<S>> {
         self.types.get(name).map(|t| TypeType::Concrete(t))
     }
 
+    /// Get a concrete type by name.
     pub fn concrete_type_by_name(&self, name: &str) -> Option<&MetaType<S>> {
         self.types.get(name)
     }
@@ -239,6 +243,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// Get the query type from the schema.
     pub fn query_type(&self) -> TypeType<S> {
         TypeType::Concrete(
             self.types
@@ -247,12 +252,14 @@ impl<'a, S> SchemaType<'a, S> {
         )
     }
 
+    /// Get the concrete query type from the schema.
     pub fn concrete_query_type(&self) -> &MetaType<S> {
         self.types
             .get(&self.query_type_name)
             .expect("Query type does not exist in schema")
     }
 
+    /// Get the mutation type from the schema.
     pub fn mutation_type(&self) -> Option<TypeType<S>> {
         if let Some(ref mutation_type_name) = self.mutation_type_name {
             Some(
@@ -264,6 +271,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// Get the concrete mutation type from the schema.
     pub fn concrete_mutation_type(&self) -> Option<&MetaType<S>> {
         self.mutation_type_name.as_ref().map(|name| {
             self.concrete_type_by_name(name)
@@ -271,6 +279,7 @@ impl<'a, S> SchemaType<'a, S> {
         })
     }
 
+    /// Get the subscription type.
     pub fn subscription_type(&self) -> Option<TypeType<S>> {
         if let Some(ref subscription_type_name) = self.subscription_type_name {
             Some(
@@ -282,6 +291,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// Get the concrete subscription type.
     pub fn concrete_subscription_type(&self) -> Option<&MetaType<S>> {
         self.subscription_type_name.as_ref().map(|name| {
             self.concrete_type_by_name(name)
@@ -289,14 +299,17 @@ impl<'a, S> SchemaType<'a, S> {
         })
     }
 
+    /// Get a list of types.
     pub fn type_list(&self) -> Vec<TypeType<S>> {
         self.types.values().map(|t| TypeType::Concrete(t)).collect()
     }
 
+    /// Get a list of concrete types.
     pub fn concrete_type_list(&self) -> Vec<&MetaType<S>> {
         self.types.values().collect()
     }
 
+    /// Make a type.
     pub fn make_type(&self, t: &Type) -> TypeType<S> {
         match *t {
             Type::NonNullNamed(ref n) => TypeType::NonNull(Box::new(
@@ -310,14 +323,17 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// Get a list of directives.
     pub fn directive_list(&self) -> Vec<&DirectiveType<S>> {
         self.directives.values().collect()
     }
 
+    /// Get directive by name.
     pub fn directive_by_name(&self, name: &str) -> Option<&DirectiveType<S>> {
         self.directives.get(name)
     }
 
+    /// Determine if there is an overlap between types.
     pub fn type_overlap(&self, t1: &MetaType<S>, t2: &MetaType<S>) -> bool {
         if (t1 as *const MetaType<S>) == (t2 as *const MetaType<S>) {
             return true;
@@ -334,6 +350,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// A list of possible typeees for a given type.
     pub fn possible_types(&self, t: &MetaType<S>) -> Vec<&MetaType<S>> {
         match *t {
             MetaType::Union(UnionMeta {
@@ -357,6 +374,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// If the abstract type is possible.
     pub fn is_possible_type(
         &self,
         abstract_type: &MetaType<S>,
@@ -367,6 +385,7 @@ impl<'a, S> SchemaType<'a, S> {
             .any(|t| (t as *const MetaType<S>) == (possible_type as *const MetaType<S>))
     }
 
+    /// If the type is a subtype of another type.
     pub fn is_subtype<'b>(&self, sub_type: &Type<'b>, super_type: &Type<'b>) -> bool {
         use crate::ast::Type::*;
 
@@ -389,6 +408,7 @@ impl<'a, S> SchemaType<'a, S> {
         }
     }
 
+    /// If the type is a named subtype.
     pub fn is_named_subtype(&self, sub_type_name: &str, super_type_name: &str) -> bool {
         if sub_type_name == super_type_name {
             true
diff --git a/juniper/src/types/scalars.rs b/juniper/src/types/scalars.rs
index c10e71b9..fa260c53 100644
--- a/juniper/src/types/scalars.rs
+++ b/juniper/src/types/scalars.rs
@@ -340,6 +340,7 @@ where
 ///
 /// If you instantiate `RootNode` with this as the subscription,
 /// no subscriptions will be generated for the schema.
+#[derive(Default)]
 pub struct EmptySubscription<T> {
     phantom: PhantomData<T>,
 }
diff --git a/juniper/src/types/subscriptions.rs b/juniper/src/types/subscriptions.rs
index 3635307c..5b6ccc56 100644
--- a/juniper/src/types/subscriptions.rs
+++ b/juniper/src/types/subscriptions.rs
@@ -364,22 +364,20 @@ where
                     } else if let Err(e) = sub_result {
                         sub_exec.push_error_at(e, start_pos.clone());
                     }
-                } else {
-                    if let Some(type_name) = meta_type.name() {
-                        let sub_result = instance
-                            .resolve_into_type_stream(info, type_name, &sub_exec)
-                            .await;
+                } else if let Some(type_name) = meta_type.name() {
+                    let sub_result = instance
+                        .resolve_into_type_stream(info, type_name, &sub_exec)
+                        .await;
 
-                        if let Ok(Value::Object(obj)) = sub_result {
-                            for (k, v) in obj {
-                                merge_key_into(&mut object, &k, v);
-                            }
-                        } else if let Err(e) = sub_result {
-                            sub_exec.push_error_at(e, start_pos.clone());
+                    if let Ok(Value::Object(obj)) = sub_result {
+                        for (k, v) in obj {
+                            merge_key_into(&mut object, &k, v);
                         }
-                    } else {
-                        return Value::Null;
+                    } else if let Err(e) = sub_result {
+                        sub_exec.push_error_at(e, start_pos.clone());
                     }
+                } else {
+                    return Value::Null;
                 }
             }
         }
diff --git a/juniper/src/validation/rules/variables_in_allowed_position.rs b/juniper/src/validation/rules/variables_in_allowed_position.rs
index d1463991..9e7e3fc3 100644
--- a/juniper/src/validation/rules/variables_in_allowed_position.rs
+++ b/juniper/src/validation/rules/variables_in_allowed_position.rs
@@ -37,7 +37,7 @@ impl<'a, S: Debug> VariableInAllowedPosition<'a, S> {
     fn collect_incorrect_usages(
         &self,
         from: &Scope<'a>,
-        var_defs: &Vec<&'a (Spanning<&'a str>, VariableDefinition<S>)>,
+        var_defs: &[&'a (Spanning<&'a str>, VariableDefinition<S>)],
         ctx: &mut ValidatorContext<'a, S>,
         visited: &mut HashSet<Scope<'a>>,
     ) {
diff --git a/juniper_codegen/src/lib.rs b/juniper_codegen/src/lib.rs
index 25736704..562e4a2f 100644
--- a/juniper_codegen/src/lib.rs
+++ b/juniper_codegen/src/lib.rs
@@ -388,15 +388,13 @@ pub fn graphql_object_internal(args: TokenStream, input: TokenStream) -> TokenSt
 /// A proc macro for defining a GraphQL subscription.
 #[proc_macro_attribute]
 pub fn graphql_subscription(args: TokenStream, input: TokenStream) -> TokenStream {
-    let gen = impl_object::build_subscription(args, input, false);
-    gen.into()
+    impl_object::build_subscription(args, input, false)
 }
 
 #[doc(hidden)]
 #[proc_macro_attribute]
 pub fn graphql_subscription_internal(args: TokenStream, input: TokenStream) -> TokenStream {
-    let gen = impl_object::build_subscription(args, input, true);
-    gen.into()
+    impl_object::build_subscription(args, input, true)
 }
 
 #[proc_macro_attribute]
diff --git a/juniper_subscriptions/src/lib.rs b/juniper_subscriptions/src/lib.rs
index 111404d9..ff6666e1 100644
--- a/juniper_subscriptions/src/lib.rs
+++ b/juniper_subscriptions/src/lib.rs
@@ -11,7 +11,7 @@
 #![deny(warnings)]
 #![doc(html_root_url = "https://docs.rs/juniper_subscriptions/0.14.2")]
 
-use std::{borrow::BorrowMut as _, iter::FromIterator, pin::Pin};
+use std::{iter::FromIterator, pin::Pin};
 
 use futures::{task::Poll, Stream};
 use juniper::{
@@ -197,12 +197,11 @@ where
                     // TODO: iterate over i and (ref field_name, ref val) once
                     //       [this RFC](https://github.com/rust-lang/rust/issues/68354)
                     //       is implemented
-                    for i in 0..obj_len {
+                    for ready in ready_vec.iter_mut().take(obj_len) {
                         let (field_name, val) = match obj_iterator.next() {
                             Some(v) => v,
                             None => break,
                         };
-                        let ready = ready_vec[i].borrow_mut();
 
                         if ready.is_some() {
                             continue;
diff --git a/juniper_warp/src/lib.rs b/juniper_warp/src/lib.rs
index 621ae385..69e5ed7d 100644
--- a/juniper_warp/src/lib.rs
+++ b/juniper_warp/src/lib.rs
@@ -343,7 +343,7 @@ where
     };
 
     let get_filter = warp::get()
-        .and(context_extractor.clone())
+        .and(context_extractor)
         .and(warp::filters::query::query())
         .and_then(handle_get_request);