rust/tests/ui/rfc-2632-const-trait-impl/std-impl-gate.rs

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// This tests feature gates for const impls in the standard library.
// revisions: stock gated
//[gated] run-pass
#![cfg_attr(gated, feature(const_trait_impl, const_default_impls))]
fn non_const_context() -> Vec<usize> {
Default::default()
}
const fn const_context() -> Vec<usize> {
Default::default()
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//[stock]~^ ERROR cannot call non-const fn
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}
fn main() {
const VAL: Vec<usize> = const_context();
assert_eq!(VAL, non_const_context());
}