A negative impl was added on a trait implementation.
Erroneous code example:
trait Trait {
type Bar;
}
struct Foo;
impl !Trait for Foo { } //~ ERROR
fn main() {} Negative impls are only allowed for auto traits. For more information see the opt-in builtin traits RFC.
© 2010 The Rust Project Developers
Licensed under the Apache License, Version 2.0 or the MIT license, at your option.
https://doc.rust-lang.org/error_codes/E0192.html