Add tests

Author: tiif

tests/ui/internal/auxiliary/unstable_feature.rs

@@ -1,4 +1,8 @@
+#![allow(internal_features)]
+
 #![feature(impl_stability)] 
+#![feature(trivial_bounds)] // TODO: figure out what is this
+
 
 pub trait Foo {
     fn foo();
@@ -10,3 +14,5 @@ pub struct Bar;
 impl Foo for Bar {
     fn foo() {}
 }
+
+fn main() {}

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

@@ -1,11 +1,12 @@
 //@ aux-build:unstable_feature.rs
 
-//#![feature(impl_stability)]
+#![feature(impl_stability)]
+#![feature(trivial_bounds)]
 
 extern crate unstable_feature;
 use unstable_feature::{Foo, Bar};
 
-fn main() {
-    //#![unstable_feature_bound(feat_foo)]
+#[unstable_feature_bound(feat_foo)]
+fn main() { //~ ERROR: `main` function is not allowed to have a `where` clause
     Bar::foo();
 }

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

@@ -1,8 +1,9 @@
-error: `unstable_feature_bound` expects a list of feature names
-  --> $DIR/unstable-feature-bound.rs:14:1
+error[E0646]: `main` function is not allowed to have a `where` clause
+  --> $DIR/unstable-feature-bound.rs:10:10
    |
-LL | #[unstable_feature_bound]
-   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+LL | fn main() {
+   |          ^ `main` cannot have a `where` clause
 
 error: aborting due to 1 previous error
 
+For more information about this error, try `rustc --explain E0646`.