Suppress clippy::ref_option_ref lint in generated code

Author: taiki-e

CHANGELOG.md

@@ -10,6 +10,8 @@ Note: In this file, do not use the hard wrap in the middle of a sentence for com
 
 ## [Unreleased]
 
+- Suppress `clippy::ref_option_ref` lint in generated code.
+
 ## [1.0.3] - 2021-01-05
 
 - Exclude unneeded files from crates.io.

pin-project-internal/src/pin_project/derive.rs

@@ -133,6 +133,7 @@ fn proj_allowed_lints(kind: TypeKind) -> (TokenStream, TokenStream, TokenStream)
     let proj_ref = quote! {
         #global_allowed_lints
         #[allow(dead_code)] // This lint warns unused fields/variants.
+        #[allow(clippy::ref_option_ref)] // This lint warns `&Option<&<ty>>`.
         #[allow(clippy::type_repetition_in_bounds)] // https://github.com/rust-lang/rust-clippy/issues/4326
     };
     let proj_own = quote! {

tests/lint.rs

@@ -1023,6 +1023,28 @@ pub mod clippy_used_underscore_binding {
     }
 }
 
+pub mod clippy_ref_option_ref {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    #[derive(Debug)]
+    pub struct Struct<'a> {
+        #[pin]
+        pub _pinned: Option<&'a ()>,
+        pub _unpinned: Option<&'a ()>,
+    }
+
+    #[pin_project(project = EnumProj, project_ref = EnumProjRef)]
+    #[derive(Debug)]
+    pub enum Enum<'a> {
+        Struct {
+            #[pin]
+            _pinned: Option<&'a ()>,
+            _unpinned: Option<&'a ()>,
+        },
+    }
+}
+
 // Run `./dev.sh +$toolchain test --test lint` to update this.
 #[cfg(not(miri))]
 #[allow(clippy::restriction)]