Stabilize param_attrs in Rust 1.39.0

src/libsyntax/feature_gate.rs

@@ -523,9 +523,6 @@ declare_features! (
     // Allows the user of associated type bounds.
     (active, associated_type_bounds, "1.34.0", Some(52662), None),
 
-    // Attributes on formal function params.
-    (active, param_attrs, "1.36.0", Some(60406), None),
-
     // Allows calling constructor functions in `const fn`.
     (active, const_constructor, "1.37.0", Some(61456), None),
 
@@ -856,6 +853,8 @@ declare_features! (
     (accepted, underscore_const_names, "1.37.0", Some(54912), None),
     // Allows free and inherent `async fn`s, `async` blocks, and `<expr>.await` expressions.
     (accepted, async_await, "1.39.0", Some(50547), None),
+    // Attributes on formal function params.
+    (accepted, param_attrs, "1.39.0", Some(60406), None),
 
     // -------------------------------------------------------------------------
     // feature-group-end: accepted features
@@ -2431,7 +2430,6 @@ pub fn check_crate(krate: &ast::Crate,
         }
     }
 
-    gate_all!(param_attrs, "attributes on function parameters are unstable");
     gate_all!(let_chains, "`let` expressions in this position are experimental");
     gate_all!(async_closure, "async closures are unstable");
     gate_all!(yields, generators, "yield syntax is experimental");

src/test/ui/lint/lint-unused-mut-variables.rs

@@ -3,7 +3,7 @@
 // Exercise the unused_mut attribute in some positive and negative cases
 
 #![deny(unused_mut)]
-#![feature(async_closure, param_attrs)]
+#![feature(async_closure)]
 
 async fn baz_async(
     mut a: i32,

src/test/ui/lint/lint-unused-variables.rs

@@ -1,7 +1,7 @@
 // compile-flags: --cfg something
 // edition:2018
 
-#![feature(async_closure, param_attrs)]
+#![feature(async_closure)]
 #![deny(unused_variables)]
 
 async fn foo_async(

src/test/ui/parser/fn-arg-doc-comment.rs

@@ -2,14 +2,10 @@ pub fn f(
     /// Comment
     //~^ ERROR documentation comments cannot be applied to function parameters
     //~| NOTE doc comments are not allowed here
-    //~| ERROR attributes on function parameters are unstable
-    //~| NOTE https://github.com/rust-lang/rust/issues/60406
     id: u8,
     /// Other
     //~^ ERROR documentation comments cannot be applied to function parameters
     //~| NOTE doc comments are not allowed here
-    //~| ERROR attributes on function parameters are unstable
-    //~| NOTE https://github.com/rust-lang/rust/issues/60406
     a: u8,
 ) {}
 

src/test/ui/parser/fn-arg-doc-comment.stderr

@@ -1,5 +1,5 @@
 error: attributes cannot be applied to a function parameter's type
-  --> $DIR/fn-arg-doc-comment.rs:16:12
+  --> $DIR/fn-arg-doc-comment.rs:12:12
    |
 LL | fn bar(id: #[allow(dead_code)] i32) {}
    |            ^^^^^^^^^^^^^^^^^^^ attributes are not allowed here
@@ -11,31 +11,13 @@ LL |     /// Comment
    |     ^^^^^^^^^^^ doc comments are not allowed here
 
 error: documentation comments cannot be applied to function parameters
-  --> $DIR/fn-arg-doc-comment.rs:8:5
+  --> $DIR/fn-arg-doc-comment.rs:6:5
    |
 LL |     /// Other
    |     ^^^^^^^^^ doc comments are not allowed here
 
-error[E0658]: attributes on function parameters are unstable
-  --> $DIR/fn-arg-doc-comment.rs:2:5
-   |
-LL |     /// Comment
-   |     ^^^^^^^^^^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/60406
-   = help: add `#![feature(param_attrs)]` to the crate attributes to enable
-
-error[E0658]: attributes on function parameters are unstable
-  --> $DIR/fn-arg-doc-comment.rs:8:5
-   |
-LL |     /// Other
-   |     ^^^^^^^^^
-   |
-   = note: for more information, see https://github.com/rust-lang/rust/issues/60406
-   = help: add `#![feature(param_attrs)]` to the crate attributes to enable
-
 error[E0308]: mismatched types
-  --> $DIR/fn-arg-doc-comment.rs:22:7
+  --> $DIR/fn-arg-doc-comment.rs:18:7
    |
 LL |     f("", "");
    |       ^^ expected u8, found reference
@@ -44,7 +26,7 @@ LL |     f("", "");
               found type `&'static str`
 
 error[E0308]: mismatched types
-  --> $DIR/fn-arg-doc-comment.rs:22:11
+  --> $DIR/fn-arg-doc-comment.rs:18:11
    |
 LL |     f("", "");
    |           ^^ expected u8, found reference
@@ -53,15 +35,14 @@ LL |     f("", "");
               found type `&'static str`
 
 error[E0308]: mismatched types
-  --> $DIR/fn-arg-doc-comment.rs:29:9
+  --> $DIR/fn-arg-doc-comment.rs:25:9
    |
 LL |     bar("");
    |         ^^ expected i32, found reference
    |
    = note: expected type `i32`
               found type `&'static str`
 
-error: aborting due to 8 previous errors
+error: aborting due to 6 previous errors
 
-Some errors have detailed explanations: E0308, E0658.
-For more information about an error, try `rustc --explain E0308`.
+For more information about this error, try `rustc --explain E0308`.

src/test/ui/rfc-2565-param-attrs/param-attrs-2018.rs

@@ -1,7 +1,5 @@
 // edition:2018
 
-#![feature(param_attrs)]
-
 trait Trait2015 { fn foo(#[allow(C)] i32); }
 //~^ ERROR expected one of `:` or `@`, found `)`
 

src/test/ui/rfc-2565-param-attrs/param-attrs-2018.stderr

@@ -1,5 +1,5 @@
 error: expected one of `:` or `@`, found `)`
-  --> $DIR/param-attrs-2018.rs:5:41
+  --> $DIR/param-attrs-2018.rs:3:41
    |
 LL | trait Trait2015 { fn foo(#[allow(C)] i32); }
    |                                         ^ expected one of `:` or `@` here

src/test/ui/rfc-2565-param-attrs/param-attrs-allowed.rs

@@ -2,7 +2,6 @@
 // compile-flags: --cfg something
 
 #![deny(unused_mut)]
-#![feature(param_attrs)]
 
 extern "C" {
     fn ffi(

src/test/ui/rfc-2565-param-attrs/param-attrs-builtin-attrs.rs

@@ -1,5 +1,3 @@
-#![feature(param_attrs)]
-
 extern "C" {
     fn ffi(
         /// Foo