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#![feature(coroutines, coroutine_trait, never_type)]
use std::ops::Coroutine;
fn mk_gen() -> impl Coroutine<Return=!, Yield=()> {
|| { loop { yield; } }
}
fn main() {
let gens: [impl Coroutine<Return=!, Yield=()>;2] = [ mk_gen(), mk_gen() ];
//~^ `impl Trait` only allowed in function and inherent method argument and return types
}
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