1 #![feature(optin_builtin_traits)]
2 #![feature(specialization)]
7 default impl S {} //~ ERROR inherent impls cannot be `default`
9 default unsafe impl Send for S {} //~ ERROR impls of auto traits cannot be default
10 default impl !Send for Z {} //~ ERROR impls of auto traits cannot be default
13 default impl !Tr for S {} //~ ERROR invalid negative impl