Visit more targets when validating attributes

compiler/rustc_hir/src/target.rs

@@ -54,6 +54,7 @@ pub enum Target {
     ForeignTy,
     GenericParam(GenericParamKind),
     MacroDef,
+    Param,
 }
 
 impl Display for Target {
@@ -96,6 +97,7 @@ impl Display for Target {
                     GenericParamKind::Const => "const parameter",
                 },
                 Target::MacroDef => "macro def",
+                Target::Param => "function param",
             }
         )
     }

compiler/rustc_passes/src/check_attr.rs

@@ -1101,17 +1101,6 @@ impl Visitor<'tcx> for CheckAttrVisitor<'tcx> {
         intravisit::walk_arm(self, arm);
     }
 
-    fn visit_macro_def(&mut self, macro_def: &'tcx hir::MacroDef<'tcx>) {
-        self.check_attributes(
-            macro_def.hir_id,
-            &macro_def.attrs,
-            &macro_def.span,
-            Target::MacroDef,
-            None,
-        );
-        intravisit::walk_macro_def(self, macro_def);
-    }
-
     fn visit_foreign_item(&mut self, f_item: &'tcx ForeignItem<'tcx>) {
         let target = Target::from_foreign_item(f_item);
         self.check_attributes(
@@ -1157,6 +1146,23 @@ impl Visitor<'tcx> for CheckAttrVisitor<'tcx> {
         self.check_attributes(variant.id, variant.attrs, &variant.span, Target::Variant, None);
         intravisit::walk_variant(self, variant, generics, item_id)
     }
+
+    fn visit_macro_def(&mut self, macro_def: &'tcx hir::MacroDef<'tcx>) {
+        self.check_attributes(
+            macro_def.hir_id,
+            macro_def.attrs,
+            &macro_def.span,
+            Target::MacroDef,
+            None,
+        );
+        intravisit::walk_macro_def(self, macro_def);
+    }
+
+    fn visit_param(&mut self, param: &'tcx hir::Param<'tcx>) {
+        self.check_attributes(param.hir_id, param.attrs, &param.span, Target::Param, None);
+
+        intravisit::walk_param(self, param);
+    }
 }
 
 fn is_c_like_enum(item: &Item<'_>) -> bool {

src/test/ui/proc-macro/ambiguous-builtin-attrs.rs

@@ -3,8 +3,8 @@
 #![feature(decl_macro)] //~ ERROR `feature` is ambiguous
 
 extern crate builtin_attrs;
-use builtin_attrs::{test, bench};
 use builtin_attrs::*;
+use builtin_attrs::{bench, test};
 
 #[repr(C)] //~ ERROR `repr` is ambiguous
 struct S;

src/test/ui/proc-macro/ambiguous-builtin-attrs.stderr

@@ -12,7 +12,7 @@ LL | #[repr(C)]
    |
    = note: `repr` could refer to a built-in attribute
 note: `repr` could also refer to the attribute macro imported here
-  --> $DIR/ambiguous-builtin-attrs.rs:7:5
+  --> $DIR/ambiguous-builtin-attrs.rs:6:5
    |
 LL | use builtin_attrs::*;
    |     ^^^^^^^^^^^^^^^^
@@ -26,7 +26,7 @@ LL | #[cfg_attr(all(), repr(C))]
    |
    = note: `repr` could refer to a built-in attribute
 note: `repr` could also refer to the attribute macro imported here
-  --> $DIR/ambiguous-builtin-attrs.rs:7:5
+  --> $DIR/ambiguous-builtin-attrs.rs:6:5
    |
 LL | use builtin_attrs::*;
    |     ^^^^^^^^^^^^^^^^
@@ -40,7 +40,7 @@ LL | fn non_macro_expanded_location<#[repr(C)] T>() {
    |
    = note: `repr` could refer to a built-in attribute
 note: `repr` could also refer to the attribute macro imported here
-  --> $DIR/ambiguous-builtin-attrs.rs:7:5
+  --> $DIR/ambiguous-builtin-attrs.rs:6:5
    |
 LL | use builtin_attrs::*;
    |     ^^^^^^^^^^^^^^^^
@@ -54,7 +54,7 @@ LL |         #[repr(C)]
    |
    = note: `repr` could refer to a built-in attribute
 note: `repr` could also refer to the attribute macro imported here
-  --> $DIR/ambiguous-builtin-attrs.rs:7:5
+  --> $DIR/ambiguous-builtin-attrs.rs:6:5
    |
 LL | use builtin_attrs::*;
    |     ^^^^^^^^^^^^^^^^
@@ -82,7 +82,7 @@ LL | #![feature(decl_macro)]
    |
    = note: `feature` could refer to a built-in attribute
 note: `feature` could also refer to the attribute macro imported here
-  --> $DIR/ambiguous-builtin-attrs.rs:7:5
+  --> $DIR/ambiguous-builtin-attrs.rs:6:5
    |
 LL | use builtin_attrs::*;
    |     ^^^^^^^^^^^^^^^^