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#![feature(optin_builtin_traits)]
#![feature(specialization)]
struct S;
struct Z;
default impl S {} //~ ERROR inherent impls cannot be `default`
default unsafe impl Send for S {} //~ ERROR impls of auto traits cannot be default
default impl !Send for Z {} //~ ERROR impls of auto traits cannot be default
trait Tr {}
default impl !Tr for S {} //~ ERROR negative impls are only allowed for auto traits
fn main() {}
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