diff --git a/integration_tests/juniper_tests/src/codegen/derive_object_with_raw_idents.rs b/integration_tests/juniper_tests/src/codegen/derive_object_with_raw_idents.rs
index 45d79630..763f89af 100644
--- a/integration_tests/juniper_tests/src/codegen/derive_object_with_raw_idents.rs
+++ b/integration_tests/juniper_tests/src/codegen/derive_object_with_raw_idents.rs
@@ -10,6 +10,7 @@ pub struct Query;
 #[juniper::graphql_object]
 impl Query {
     fn r#type(r#fn: MyInputType) -> Vec<String> {
+        let _ = r#fn;
         unimplemented!()
     }
 }
diff --git a/juniper/src/ast.rs b/juniper/src/ast.rs
index 2881515b..37f95821 100644
--- a/juniper/src/ast.rs
+++ b/juniper/src/ast.rs
@@ -343,12 +343,12 @@ where
     }
 
     /// View the underlying int value, if present.
-    pub fn as_int_value<'a>(&'a self) -> Option<i32> {
+    pub fn as_int_value(&self) -> Option<i32> {
         self.as_scalar_value().and_then(|s| s.as_int())
     }
 
     /// View the underlying float value, if present.
-    pub fn as_float_value<'a>(&'a self) -> Option<f64> {
+    pub fn as_float_value(&self) -> Option<f64> {
         self.as_scalar_value().and_then(|s| s.as_float())
     }
 
diff --git a/juniper/src/executor_tests/executor.rs b/juniper/src/executor_tests/executor.rs
index 0b14f1ba..87bef837 100644
--- a/juniper/src/executor_tests/executor.rs
+++ b/juniper/src/executor_tests/executor.rs
@@ -1085,7 +1085,7 @@ mod named_operations {
     #[crate::graphql_object_internal]
     impl Schema {
         fn a(p: Option<String>) -> &str {
-            dbg!(p);
+            let _ = p;
             "b"
         }
     }
diff --git a/juniper/src/executor_tests/introspection/input_object.rs b/juniper/src/executor_tests/introspection/input_object.rs
index bb5a6391..d7970ae7 100644
--- a/juniper/src/executor_tests/introspection/input_object.rs
+++ b/juniper/src/executor_tests/introspection/input_object.rs
@@ -1,3 +1,5 @@
+#![deny(unused_variables)]
+
 use juniper_codegen::GraphQLInputObjectInternal as GraphQLInputObject;
 
 use crate::{
@@ -10,13 +12,13 @@ use crate::{
 
 struct Root;
 
-#[derive(GraphQLInputObject)]
+#[derive(GraphQLInputObject, Debug)]
 struct DefaultName {
     field_one: String,
     field_two: String,
 }
 
-#[derive(GraphQLInputObject)]
+#[derive(GraphQLInputObject, Debug)]
 struct NoTrailingComma {
     field_one: String,
     field_two: String,
@@ -96,6 +98,17 @@ impl Root {
         a10: NamedPublic,
         a11: FieldWithDefaults,
     ) -> i32 {
+        let _ = a1;
+        let _ = a2;
+        let _ = a3;
+        let _ = a4;
+        let _ = a5;
+        let _ = a6;
+        let _ = a7;
+        let _ = a8;
+        let _ = a9;
+        let _ = a10;
+        let _ = a11;
         0
     }
 }
diff --git a/juniper/src/macros/tests/args.rs b/juniper/src/macros/tests/args.rs
index f7292355..209b1bd6 100644
--- a/juniper/src/macros/tests/args.rs
+++ b/juniper/src/macros/tests/args.rs
@@ -134,8 +134,8 @@ impl Root {
         ),
     )]
     fn args_with_complex_default(arg1: String, arg2: Point) -> i32 {
-        dbg!(arg1);
-        dbg!(arg2);
+        let _ = arg1;
+        let _ = arg2;
         0
     }
 }
diff --git a/juniper/src/util.rs b/juniper/src/util.rs
index ccf7a16e..3a11108e 100644
--- a/juniper/src/util.rs
+++ b/juniper/src/util.rs
@@ -4,7 +4,7 @@ use std::borrow::Cow;
 ///
 /// Note: needs to be public because several macros use it.
 #[doc(hidden)]
-pub fn to_camel_case<'a>(s: &'a str) -> Cow<'_, str> {
+pub fn to_camel_case(s: &'_ str) -> Cow<'_, str> {
     let mut dest = Cow::Borrowed(s);
 
     for (i, part) in s.split('_').enumerate() {
diff --git a/juniper_codegen/src/derive_input_object.rs b/juniper_codegen/src/derive_input_object.rs
index 6b3acc31..ed42ae14 100644
--- a/juniper_codegen/src/derive_input_object.rs
+++ b/juniper_codegen/src/derive_input_object.rs
@@ -206,11 +206,13 @@ pub fn impl_input_object(ast: &syn::DeriveInput, is_internal: bool) -> TokenStre
                                 e.to_tokens(&mut tokens);
                                 Some(tokens)
                             }
-                            Err(_) => {
+                            Err(e) => {
+                                let _ = e;
                                 panic!("#graphql(default = ?) must be a valid Rust expression inside a string");
                             }
                         },
-                        Err(_) => {
+                        Err(e) => {
+                            let _ = e;
                             panic!("#graphql(default = ?) must be a valid Rust expression inside a string");
                         }
                     },