Update error message

Author: tiif

compiler/rustc_passes/messages.ftl

@@ -669,8 +669,8 @@ passes_rustc_std_internal_symbol =
     .label = not a function or static
 
 passes_rustc_unstable_feature_bound =
-    attribute should be applied to `impl` or free function outside of any `impl` or trait
-    .label = not an `impl` or free function
+    attribute should be applied to `impl`, trait or free function
+    .label = not an `impl`, trait or free function
 
 passes_should_be_applied_to_fn =
     attribute should be applied to a function definition

tests/ui/unstable-feature-bound/unstable_inherent_method.rs

@@ -9,14 +9,14 @@
 pub trait Trait {
     #[unstable(feature = "feat", issue = "none" )]
     #[unstable_feature_bound(foo)]
-    //~^ ERROR: attribute should be applied to `impl` or free function outside of any `impl` or trait
+    //~^ ERROR: attribute should be applied to `impl`, trait or free function
     fn foo();
 }
 
 #[stable(feature = "a", since = "1.1.1" )]
 impl Trait for u8 {
     #[unstable_feature_bound(foo)]
-    //~^ ERROR: attribute should be applied to `impl` or free function outside of any `impl` or trait
+    //~^ ERROR: attribute should be applied to `impl`, trait or free function
     fn foo() {}
 }
 

tests/ui/unstable-feature-bound/unstable_inherent_method.stderr

@@ -1,20 +1,20 @@
-error: attribute should be applied to `impl` or free function outside of any `impl` or trait
+error: attribute should be applied to `impl`, trait or free function
   --> $DIR/unstable_inherent_method.rs:11:5
    |
 LL |     #[unstable_feature_bound(foo)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL |     fn foo();
-   |     --------- not an `impl` or free function
+   |     --------- not an `impl`, trait or free function
 
-error: attribute should be applied to `impl` or free function outside of any `impl` or trait
+error: attribute should be applied to `impl`, trait or free function
   --> $DIR/unstable_inherent_method.rs:18:5
    |
 LL |     #[unstable_feature_bound(foo)]
    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 LL |
 LL |     fn foo() {}
-   |     ----------- not an `impl` or free function
+   |     ----------- not an `impl`, trait or free function
 
 error: aborting due to 2 previous errors