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-rw-r--r--clippy_lints/src/functions/ref_option.rs32
-rw-r--r--tests/ui-toml/ref_option/ref_option.all.fixed49
-rw-r--r--tests/ui-toml/ref_option/ref_option.all.stderr26
-rw-r--r--tests/ui-toml/ref_option/ref_option.private.fixed49
-rw-r--r--tests/ui-toml/ref_option/ref_option.private.stderr18
-rw-r--r--tests/ui-toml/ref_option/ref_option.rs49
-rw-r--r--tests/ui-toml/ref_option/ref_option_traits.all.stderr8
-rw-r--r--tests/ui-toml/ref_option/ref_option_traits.private.stderr4
-rw-r--r--tests/ui-toml/ref_option/ref_option_traits.rs31
9 files changed, 230 insertions, 36 deletions
diff --git a/clippy_lints/src/functions/ref_option.rs b/clippy_lints/src/functions/ref_option.rs
index b4ae258ebbb..5dc1b7269b7 100644
--- a/clippy_lints/src/functions/ref_option.rs
+++ b/clippy_lints/src/functions/ref_option.rs
@@ -1,18 +1,19 @@
 use crate::functions::REF_OPTION;
 use clippy_utils::diagnostics::span_lint_and_then;
-use clippy_utils::is_trait_impl_item;
 use clippy_utils::source::snippet;
 use clippy_utils::ty::option_arg_ty;
+use clippy_utils::{is_from_proc_macro, is_trait_impl_item};
 use rustc_errors::Applicability;
 use rustc_hir::intravisit::FnKind;
 use rustc_hir::{self as hir, FnDecl, HirId};
-use rustc_lint::LateContext;
+use rustc_lint::{LateContext, LintContext};
 use rustc_middle::ty::{self, Mutability, Ty};
 use rustc_span::Span;
 use rustc_span::def_id::LocalDefId;
 
 fn check_ty<'a>(cx: &LateContext<'a>, param: &hir::Ty<'a>, param_ty: Ty<'a>, fixes: &mut Vec<(Span, String)>) {
-    if let ty::Ref(_, opt_ty, Mutability::Not) = param_ty.kind()
+    if !param.span.in_external_macro(cx.sess().source_map())
+        && let ty::Ref(_, opt_ty, Mutability::Not) = param_ty.kind()
         && let Some(gen_ty) = option_arg_ty(cx, *opt_ty)
         && !gen_ty.is_ref()
         // Need to gen the original spans, so first parsing mid, and hir parsing afterward
@@ -23,6 +24,7 @@ fn check_ty<'a>(cx: &LateContext<'a>, param: &hir::Ty<'a>, param_ty: Ty<'a>, fix
             args: [hir::GenericArg::Type(opt_ty)],
             ..
         }) = last.args
+        && !is_from_proc_macro(cx, param)
     {
         let lifetime = snippet(cx, lifetime.ident.span, "..");
         fixes.push((
@@ -63,21 +65,24 @@ fn check_fn_sig<'a>(cx: &LateContext<'a>, decl: &FnDecl<'a>, span: Span, sig: ty
 #[allow(clippy::too_many_arguments)]
 pub(crate) fn check_fn<'a>(
     cx: &LateContext<'a>,
-    kind: FnKind<'_>,
+    kind: FnKind<'a>,
     decl: &FnDecl<'a>,
     span: Span,
     hir_id: HirId,
     def_id: LocalDefId,
-    body: &hir::Body<'_>,
+    body: &hir::Body<'a>,
     avoid_breaking_exported_api: bool,
 ) {
     if avoid_breaking_exported_api && cx.effective_visibilities.is_exported(def_id) {
         return;
     }
+    if span.in_external_macro(cx.sess().source_map()) {
+        return;
+    }
 
     if let FnKind::Closure = kind {
         // Compute the span of the closure parameters + return type if set
-        let span = if let hir::FnRetTy::Return(out_ty) = &decl.output {
+        let inputs_output_span = if let hir::FnRetTy::Return(out_ty) = &decl.output {
             if decl.inputs.is_empty() {
                 out_ty.span
             } else {
@@ -96,9 +101,18 @@ pub(crate) fn check_fn<'a>(
         };
         let sig = args.as_closure().sig().skip_binder();
 
-        check_fn_sig(cx, decl, span, sig);
+        if is_from_proc_macro(cx, &(&kind, body, hir_id, span)) {
+            return;
+        }
+
+        check_fn_sig(cx, decl, inputs_output_span, sig);
     } else if !is_trait_impl_item(cx, hir_id) {
         let sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();
+
+        if is_from_proc_macro(cx, &(&kind, body, hir_id, span)) {
+            return;
+        }
+
         check_fn_sig(cx, decl, span, sig);
     }
 }
@@ -108,8 +122,10 @@ pub(super) fn check_trait_item<'a>(
     trait_item: &hir::TraitItem<'a>,
     avoid_breaking_exported_api: bool,
 ) {
-    if let hir::TraitItemKind::Fn(ref sig, _) = trait_item.kind
+    if !trait_item.span.in_external_macro(cx.sess().source_map())
+        && let hir::TraitItemKind::Fn(ref sig, _) = trait_item.kind
         && !(avoid_breaking_exported_api && cx.effective_visibilities.is_exported(trait_item.owner_id.def_id))
+        && !is_from_proc_macro(cx, trait_item)
     {
         let def_id = trait_item.owner_id.def_id;
         let ty_sig = cx.tcx.fn_sig(def_id).instantiate_identity().skip_binder();
diff --git a/tests/ui-toml/ref_option/ref_option.all.fixed b/tests/ui-toml/ref_option/ref_option.all.fixed
index 102d4aaefff..f8f097e9a75 100644
--- a/tests/ui-toml/ref_option/ref_option.all.fixed
+++ b/tests/ui-toml/ref_option/ref_option.all.fixed
@@ -1,3 +1,4 @@
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 //@revisions: private all
 //@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
 //@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
@@ -62,4 +63,52 @@ fn lambdas() {
     let x = |a: &Option<String>| -> &Option<String> { panic!() };
 }
 
+pub mod external {
+    proc_macros::external!(
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
+pub mod proc_macros {
+    proc_macros::with_span!(
+        span
+
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
 fn main() {}
diff --git a/tests/ui-toml/ref_option/ref_option.all.stderr b/tests/ui-toml/ref_option/ref_option.all.stderr
index efd7a6b7241..45ce105e030 100644
--- a/tests/ui-toml/ref_option/ref_option.all.stderr
+++ b/tests/ui-toml/ref_option/ref_option.all.stderr
@@ -1,5 +1,5 @@
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:8:1
+  --> tests/ui-toml/ref_option/ref_option.rs:9:1
    |
 LL | fn opt_u8(a: &Option<u8>) {}
    | ^^^^^^^^^^^^^-----------^^^^
@@ -10,7 +10,7 @@ LL | fn opt_u8(a: &Option<u8>) {}
    = help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:10:1
+  --> tests/ui-toml/ref_option/ref_option.rs:11:1
    |
 LL | fn opt_gen<T>(a: &Option<T>) {}
    | ^^^^^^^^^^^^^^^^^----------^^^^
@@ -18,7 +18,7 @@ LL | fn opt_gen<T>(a: &Option<T>) {}
    |                  help: change this to: `Option<&T>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:12:1
+  --> tests/ui-toml/ref_option/ref_option.rs:13:1
    |
 LL | fn opt_string(a: &std::option::Option<String>) {}
    | ^^^^^^^^^^^^^^^^^----------------------------^^^^
@@ -26,7 +26,7 @@ LL | fn opt_string(a: &std::option::Option<String>) {}
    |                  help: change this to: `std::option::Option<&String>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:14:1
+  --> tests/ui-toml/ref_option/ref_option.rs:15:1
    |
 LL |   fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
    |   ^                            -------------- help: change this to: `Option<&'a u8>`
@@ -38,7 +38,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:18:1
+  --> tests/ui-toml/ref_option/ref_option.rs:19:1
    |
 LL |   fn ret_u8_static() -> &'static Option<u8> {
    |   ^                     ------------------- help: change this to: `Option<&'static u8>`
@@ -50,7 +50,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:22:1
+  --> tests/ui-toml/ref_option/ref_option.rs:23:1
    |
 LL | fn mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -62,7 +62,7 @@ LL + fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
    |
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:24:1
+  --> tests/ui-toml/ref_option/ref_option.rs:25:1
    |
 LL |   fn ret_box<'a>() -> &'a Option<Box<u8>> {
    |   ^                   ------------------- help: change this to: `Option<&'a Box<u8>>`
@@ -74,7 +74,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:29:1
+  --> tests/ui-toml/ref_option/ref_option.rs:30:1
    |
 LL | pub fn pub_opt_string(a: &Option<String>) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^---------------^^^^
@@ -82,7 +82,7 @@ LL | pub fn pub_opt_string(a: &Option<String>) {}
    |                          help: change this to: `Option<&String>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:31:1
+  --> tests/ui-toml/ref_option/ref_option.rs:32:1
    |
 LL | pub fn pub_mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -94,7 +94,7 @@ LL + pub fn pub_mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
    |
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:37:5
+  --> tests/ui-toml/ref_option/ref_option.rs:38:5
    |
 LL |     pub fn pub_opt_params(&self, a: &Option<()>) {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@@ -102,7 +102,7 @@ LL |     pub fn pub_opt_params(&self, a: &Option<()>) {}
    |                                     help: change this to: `Option<&()>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:39:5
+  --> tests/ui-toml/ref_option/ref_option.rs:40:5
    |
 LL |       pub fn pub_opt_ret(&self) -> &Option<String> {
    |       ^                            --------------- help: change this to: `Option<&String>`
@@ -114,7 +114,7 @@ LL | |     }
    | |_____^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:44:5
+  --> tests/ui-toml/ref_option/ref_option.rs:45:5
    |
 LL |     fn private_opt_params(&self, a: &Option<()>) {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@@ -122,7 +122,7 @@ LL |     fn private_opt_params(&self, a: &Option<()>) {}
    |                                     help: change this to: `Option<&()>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:46:5
+  --> tests/ui-toml/ref_option/ref_option.rs:47:5
    |
 LL |       fn private_opt_ret(&self) -> &Option<String> {
    |       ^                            --------------- help: change this to: `Option<&String>`
diff --git a/tests/ui-toml/ref_option/ref_option.private.fixed b/tests/ui-toml/ref_option/ref_option.private.fixed
index 396188b6d40..4dd14a82206 100644
--- a/tests/ui-toml/ref_option/ref_option.private.fixed
+++ b/tests/ui-toml/ref_option/ref_option.private.fixed
@@ -1,3 +1,4 @@
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 //@revisions: private all
 //@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
 //@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
@@ -62,4 +63,52 @@ fn lambdas() {
     let x = |a: &Option<String>| -> &Option<String> { panic!() };
 }
 
+pub mod external {
+    proc_macros::external!(
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
+pub mod proc_macros {
+    proc_macros::with_span!(
+        span
+
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
 fn main() {}
diff --git a/tests/ui-toml/ref_option/ref_option.private.stderr b/tests/ui-toml/ref_option/ref_option.private.stderr
index 56f38c44f14..a63efd60a03 100644
--- a/tests/ui-toml/ref_option/ref_option.private.stderr
+++ b/tests/ui-toml/ref_option/ref_option.private.stderr
@@ -1,5 +1,5 @@
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:8:1
+  --> tests/ui-toml/ref_option/ref_option.rs:9:1
    |
 LL | fn opt_u8(a: &Option<u8>) {}
    | ^^^^^^^^^^^^^-----------^^^^
@@ -10,7 +10,7 @@ LL | fn opt_u8(a: &Option<u8>) {}
    = help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:10:1
+  --> tests/ui-toml/ref_option/ref_option.rs:11:1
    |
 LL | fn opt_gen<T>(a: &Option<T>) {}
    | ^^^^^^^^^^^^^^^^^----------^^^^
@@ -18,7 +18,7 @@ LL | fn opt_gen<T>(a: &Option<T>) {}
    |                  help: change this to: `Option<&T>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:12:1
+  --> tests/ui-toml/ref_option/ref_option.rs:13:1
    |
 LL | fn opt_string(a: &std::option::Option<String>) {}
    | ^^^^^^^^^^^^^^^^^----------------------------^^^^
@@ -26,7 +26,7 @@ LL | fn opt_string(a: &std::option::Option<String>) {}
    |                  help: change this to: `std::option::Option<&String>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:14:1
+  --> tests/ui-toml/ref_option/ref_option.rs:15:1
    |
 LL |   fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
    |   ^                            -------------- help: change this to: `Option<&'a u8>`
@@ -38,7 +38,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:18:1
+  --> tests/ui-toml/ref_option/ref_option.rs:19:1
    |
 LL |   fn ret_u8_static() -> &'static Option<u8> {
    |   ^                     ------------------- help: change this to: `Option<&'static u8>`
@@ -50,7 +50,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:22:1
+  --> tests/ui-toml/ref_option/ref_option.rs:23:1
    |
 LL | fn mult_string(a: &Option<String>, b: &Option<Vec<u8>>) {}
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -62,7 +62,7 @@ LL + fn mult_string(a: Option<&String>, b: Option<&Vec<u8>>) {}
    |
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:24:1
+  --> tests/ui-toml/ref_option/ref_option.rs:25:1
    |
 LL |   fn ret_box<'a>() -> &'a Option<Box<u8>> {
    |   ^                   ------------------- help: change this to: `Option<&'a Box<u8>>`
@@ -74,7 +74,7 @@ LL | | }
    | |_^
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:44:5
+  --> tests/ui-toml/ref_option/ref_option.rs:45:5
    |
 LL |     fn private_opt_params(&self, a: &Option<()>) {}
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^-----------^^^^
@@ -82,7 +82,7 @@ LL |     fn private_opt_params(&self, a: &Option<()>) {}
    |                                     help: change this to: `Option<&()>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option.rs:46:5
+  --> tests/ui-toml/ref_option/ref_option.rs:47:5
    |
 LL |       fn private_opt_ret(&self) -> &Option<String> {
    |       ^                            --------------- help: change this to: `Option<&String>`
diff --git a/tests/ui-toml/ref_option/ref_option.rs b/tests/ui-toml/ref_option/ref_option.rs
index 7600c58ea70..8397c2213d1 100644
--- a/tests/ui-toml/ref_option/ref_option.rs
+++ b/tests/ui-toml/ref_option/ref_option.rs
@@ -1,3 +1,4 @@
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 //@revisions: private all
 //@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
 //@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
@@ -62,4 +63,52 @@ fn lambdas() {
     let x = |a: &Option<String>| -> &Option<String> { panic!() };
 }
 
+pub mod external {
+    proc_macros::external!(
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
+pub mod proc_macros {
+    proc_macros::with_span!(
+        span
+
+        fn opt_u8(a: &Option<u8>) {}
+        fn ret_u8<'a>(p: &'a str) -> &'a Option<u8> {
+            panic!()
+        }
+        pub fn pub_opt_u8(a: &Option<u8>) {}
+
+        pub struct PubStruct;
+        impl PubStruct {
+            pub fn pub_opt_params(&self, a: &Option<()>) {}
+            pub fn pub_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+
+            fn private_opt_params(&self, a: &Option<()>) {}
+            fn private_opt_ret(&self) -> &Option<String> {
+                panic!()
+            }
+        }
+    );
+}
+
 fn main() {}
diff --git a/tests/ui-toml/ref_option/ref_option_traits.all.stderr b/tests/ui-toml/ref_option/ref_option_traits.all.stderr
index 61017eba176..602e148be60 100644
--- a/tests/ui-toml/ref_option/ref_option_traits.all.stderr
+++ b/tests/ui-toml/ref_option/ref_option_traits.all.stderr
@@ -1,5 +1,5 @@
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:9:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:10:5
    |
 LL |     fn pub_trait_opt(&self, a: &Option<Vec<u8>>);
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------^^
@@ -10,7 +10,7 @@ LL |     fn pub_trait_opt(&self, a: &Option<Vec<u8>>);
    = help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:11:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:12:5
    |
 LL |     fn pub_trait_ret(&self) -> &Option<Vec<u8>>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^----------------^
@@ -18,7 +18,7 @@ LL |     fn pub_trait_ret(&self) -> &Option<Vec<u8>>;
    |                                help: change this to: `Option<&Vec<u8>>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:16:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:17:5
    |
 LL |     fn trait_opt(&self, a: &Option<String>);
    |     ^^^^^^^^^^^^^^^^^^^^^^^---------------^^
@@ -26,7 +26,7 @@ LL |     fn trait_opt(&self, a: &Option<String>);
    |                            help: change this to: `Option<&String>`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:18:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:19:5
    |
 LL |     fn trait_ret(&self) -> &Option<String>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^---------------^
diff --git a/tests/ui-toml/ref_option/ref_option_traits.private.stderr b/tests/ui-toml/ref_option/ref_option_traits.private.stderr
index d7b0b6e9f83..20bea400edf 100644
--- a/tests/ui-toml/ref_option/ref_option_traits.private.stderr
+++ b/tests/ui-toml/ref_option/ref_option_traits.private.stderr
@@ -1,5 +1,5 @@
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:16:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:17:5
    |
 LL |     fn trait_opt(&self, a: &Option<String>);
    |     ^^^^^^^^^^^^^^^^^^^^^^^---------------^^
@@ -10,7 +10,7 @@ LL |     fn trait_opt(&self, a: &Option<String>);
    = help: to override `-D warnings` add `#[allow(clippy::ref_option)]`
 
 error: it is more idiomatic to use `Option<&T>` instead of `&Option<T>`
-  --> tests/ui-toml/ref_option/ref_option_traits.rs:18:5
+  --> tests/ui-toml/ref_option/ref_option_traits.rs:19:5
    |
 LL |     fn trait_ret(&self) -> &Option<String>;
    |     ^^^^^^^^^^^^^^^^^^^^^^^---------------^
diff --git a/tests/ui-toml/ref_option/ref_option_traits.rs b/tests/ui-toml/ref_option/ref_option_traits.rs
index c02d154b448..e1477d7f846 100644
--- a/tests/ui-toml/ref_option/ref_option_traits.rs
+++ b/tests/ui-toml/ref_option/ref_option_traits.rs
@@ -1,4 +1,5 @@
 //@no-rustfix: fixes are only done to traits, not the impls
+//@aux-build:../../ui/auxiliary/proc_macros.rs
 //@revisions: private all
 //@[private] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/private
 //@[all] rustc-env:CLIPPY_CONF_DIR=tests/ui-toml/ref_option/all
@@ -37,4 +38,34 @@ impl PrivateTrait for PrivateStruct {
     }
 }
 
+pub mod external {
+    proc_macros::external!(
+        pub trait PubTrait {
+            fn pub_trait_opt(&self, a: &Option<Vec<u8>>);
+            fn pub_trait_ret(&self) -> &Option<Vec<u8>>;
+        }
+
+        trait PrivateTrait {
+            fn trait_opt(&self, a: &Option<String>);
+            fn trait_ret(&self) -> &Option<String>;
+        }
+    );
+}
+
+pub mod proc_macros {
+    proc_macros::with_span!(
+        span
+
+        pub trait PubTrait {
+            fn pub_trait_opt(&self, a: &Option<Vec<u8>>);
+            fn pub_trait_ret(&self) -> &Option<Vec<u8>>;
+        }
+
+        trait PrivateTrait {
+            fn trait_opt(&self, a: &Option<String>);
+            fn trait_ret(&self) -> &Option<String>;
+        }
+    );
+}
+
 fn main() {}
generated by cgit-pink 1.4.1-3-g733a5 (git 2.37.1) at 2026-01-13 09:45:46 +0000