Test unstable feature bound

Author: tiif

tests/ui/internal/auxiliary/unstable_feature.rs

@@ -1,11 +1,15 @@
 #![allow(internal_features)] // Enabled to use #![feature(staged_api)] and #![feature(impl_stability)]
 #![feature(staged_api)] // Enabled to use  #![unstable(feature = "feat_foo", issue = "none")]
 #![feature(impl_stability)] // Enabled to use #[unstable_feature_bound(feat_foo)] 
-#![unstable(feature = "feat_foo", issue = "none")]
+#![allow(dead_code)]
+#![unstable(feature = "feat_foo", issue = "none" )]
 
+#[stable(feature = "a", since = "1.1.1" )]
 pub trait Foo {
+    #[stable(feature = "a", since = "1.1.1" )]
     fn foo();
 }
+#[stable(feature = "a", since = "1.1.1" )]
 pub struct Bar;
 
 // Annotate the impl as unstable.
@@ -16,7 +20,6 @@ impl Foo for Bar {
 
 // Use the unstable impl inside std/core.
 #[unstable_feature_bound(feat_foo)] 
-#[allow(dead_code)]
 fn bar() {
     Bar::foo();
 }

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

@@ -7,6 +7,4 @@ use unstable_feature::{Foo, Bar}; //~ ERROR: use of unstable library feature `fe
 
 fn main() { 
     Bar::foo(); //~ ERROR: type annotations needed: cannot satisfy `unstable feature: `feat_foo``
-    //~^ ERROR: use of unstable library feature `feat_foo`
-    //~^^ ERROR: use of unstable library feature `feat_foo`
 }

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

@@ -35,24 +35,6 @@ LL | use unstable_feature::{Foo, Bar};
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
    = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
 
-error[E0658]: use of unstable library feature `feat_foo`
-  --> $DIR/unstable-feature-bound.rs:9:5
-   |
-LL |     Bar::foo();
-   |     ^^^
-   |
-   = help: add `#![feature(feat_foo)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
-error[E0658]: use of unstable library feature `feat_foo`
-  --> $DIR/unstable-feature-bound.rs:9:5
-   |
-LL |     Bar::foo();
-   |     ^^^^^^^^
-   |
-   = help: add `#![feature(feat_foo)]` to the crate attributes to enable
-   = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
-
 error[E0284]: type annotations needed: cannot satisfy `unstable feature: `feat_foo``
   --> $DIR/unstable-feature-bound.rs:9:5
    |
@@ -61,7 +43,7 @@ LL |     Bar::foo();
    |
    = note: required for `Bar` to implement `Foo`
 
-error: aborting due to 7 previous errors
+error: aborting due to 5 previous errors
 
 Some errors have detailed explanations: E0284, E0658.
 For more information about an error, try `rustc --explain E0284`.