Fix rustdoc test

Author: oli-obk

src/test/rustdoc/const-display.rs

@@ -4,12 +4,12 @@
             reason = "who ever let humans program computers, we're apparently really bad at it",
             issue = "0")]
 
-#![feature(const_fn, foo, foo2)]
+#![feature(foo, foo2)]
 #![feature(staged_api)]
 
 // @has 'foo/fn.foo.html' '//pre' 'pub unsafe fn foo() -> u32'
 #[stable(feature = "rust1", since = "1.0.0")]
-#[rustc_const_unstable(feature="foo")]
+#[rustc_const_unstable(feature="foo", issue = "0")]
 pub const unsafe fn foo() -> u32 { 42 }
 
 // @has 'foo/fn.foo2.html' '//pre' 'pub fn foo2() -> u32'
@@ -18,6 +18,7 @@ pub const fn foo2() -> u32 { 42 }
 
 // @has 'foo/fn.bar2.html' '//pre' 'pub const fn bar2() -> u32'
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
 pub const fn bar2() -> u32 { 42 }
 
 // @has 'foo/fn.foo2_gated.html' '//pre' 'pub unsafe fn foo2_gated() -> u32'
@@ -26,6 +27,7 @@ pub const unsafe fn foo2_gated() -> u32 { 42 }
 
 // @has 'foo/fn.bar2_gated.html' '//pre' 'pub const unsafe fn bar2_gated() -> u32'
 #[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_const_stable(feature = "rust1", since = "1.0.0")]
 pub const unsafe fn bar2_gated() -> u32 { 42 }
 
 // @has 'foo/fn.bar_not_gated.html' '//pre' 'pub unsafe fn bar_not_gated() -> u32'