Adjust tests for removal of impl Foo for .. {}

src/libstd/panic.rs

@@ -101,7 +101,7 @@ pub use panicking::{take_hook, set_hook, PanicInfo, Location};
 #[stable(feature = "catch_unwind", since = "1.9.0")]
 #[rustc_on_unimplemented = "the type {Self} may not be safely transferred \
                             across an unwind boundary"]
-pub trait UnwindSafe {}
+pub auto trait UnwindSafe {}
 
 /// A marker trait representing types where a shared reference is considered
 /// unwind safe.
@@ -115,7 +115,7 @@ pub trait UnwindSafe {}
 #[rustc_on_unimplemented = "the type {Self} may contain interior mutability \
                             and a reference may not be safely transferrable \
                             across a catch_unwind boundary"]
-pub trait RefUnwindSafe {}
+pub auto trait RefUnwindSafe {}
 
 /// A simple wrapper around a type to assert that it is unwind safe.
 ///