rust/tests/ui/feature-gates/feature-gate-freeze-impls.rs

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#![feature(freeze, negative_impls)]
use std::marker::Freeze;
struct Foo;
unsafe impl Freeze for Foo {}
//~^ explicit impls for the `Freeze` trait are not permitted
struct Bar;
impl !Freeze for Bar {}
//~^ explicit impls for the `Freeze` trait are not permitted
fn main() {}