WIP: the test should not pass

Author: tiif

tests/ui/internal/auxiliary/unstable_feature.rs

@@ -0,0 +1,12 @@
+#![feature(impl_stability)] 
+
+pub trait Foo {
+    fn foo();
+}
+
+pub struct Bar;
+
+#[unstable_feature_bound(feat_foo)]
+impl Foo for Bar {
+    fn foo() {}
+}

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

@@ -0,0 +1,11 @@
+//@ aux-build:unstable_feature.rs
+
+//#![feature(impl_stability)]
+
+extern crate unstable_feature;
+use unstable_feature::{Foo, Bar};
+
+fn main() {
+    //#![unstable_feature_bound(feat_foo)]
+    Bar::foo();
+}

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

@@ -0,0 +1,8 @@
+error: `unstable_feature_bound` expects a list of feature names
+  --> $DIR/unstable-feature-bound.rs:14:1
+   |
+LL | #[unstable_feature_bound]
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: aborting due to 1 previous error
+