feature-gate.rs

//@ revisions: stock gated
// gate-test-const_trait_impl

#![cfg_attr(gated, feature(const_trait_impl))]
#![feature(rustc_attrs)]

struct S;
#[const_trait] //[stock]~ ERROR `const_trait` is a temporary placeholder
trait T {}
impl const T for S {}
//[stock]~^ ERROR const trait impls are experimental

const fn f<A: ~const T>() {} //[stock]~ ERROR const trait impls are experimental
fn g<A: const T>() {} //[stock]~ ERROR const trait impls are experimental

macro_rules! discard { ($ty:ty) => {} }

discard! { impl ~const T } //[stock]~ ERROR const trait impls are experimental
discard! { impl const T } //[stock]~ ERROR const trait impls are experimental

#[rustc_error]
fn main() {} //[gated]~ ERROR fatal error triggered by #[rustc_error]