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#![feature(type_alias_impl_trait)]
//@ check-pass
type Foo = impl std::iter::FromIterator<i32> + PartialEq<Vec<i32>> + std::fmt::Debug;
#[define_opaque(Foo)]
fn foo(b: bool) -> Foo {
if b { vec![42_i32] } else { std::iter::empty().collect() }
}
fn bar(b: bool) -> impl PartialEq<Vec<i32>> + std::fmt::Debug {
if b { vec![42_i32] } else { std::iter::empty().collect() }
}
fn main() {
assert_eq!(foo(true), vec![42]);
assert_eq!(foo(false), vec![]);
assert_eq!(bar(true), vec![42]);
assert_eq!(bar(false), vec![]);
}
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