Suppress #[expect] attributes in the generated code (#619)

Fixes #614

CHANGELOG.md

@@ -7,6 +7,10 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 
 ### Fixed
 
+- Suppress warnings about the `#[expect]` lint, new in Rust 1.81.0, in
+  generated code.
+  ([#619](https://github.com/asomers/mockall/pull/619))
+
 - Suppress the `#[clippy::ref_option]` warning, new in Rust 1.83.0, in
   generated code.
   ([#618](https://github.com/asomers/mockall/pull/618))

mockall/tests/automock_clippy_expect.rs

@@ -0,0 +1,13 @@
+//! It should be possible to use #[expect::clippy] within an #[automock] block
+
+use mockall::automock;
+
+pub struct Foo {}
+
+#[automock]
+impl Foo {
+    #[expect(unused_variables)]
+    pub fn foo(&self) {
+        let a = 0;
+    }
+}

mockall_derive/src/lib.rs

@@ -820,6 +820,11 @@ impl<'a> AttrFormatter<'a> {
                     self.doc
                 } else if *i.as_ref().unwrap() == "async_trait" {
                     self.async_trait
+                } else if *i.as_ref().unwrap() == "expect" {
+                    // This probably means that there's a lint that needs to be
+                    // surpressed for the real code, but not for the mock code.
+                    // Skip it.
+                    false
                 } else if *i.as_ref().unwrap() == "inline" {
                     // No need to inline mock functions.
                     false