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#![feature(type_alias_impl_trait)]
type Foo = impl std::fmt::Debug;
fn foo(b: bool) -> Foo {
if b {
vec![42_i32]
} else {
std::iter::empty().collect()
}
}
type Bar = impl std::fmt::Debug;
fn bar(b: bool) -> Bar {
let x: Bar = if b {
vec![42_i32]
} else {
std::iter::empty().collect()
//~^ ERROR a value of type `Bar` cannot be built from an iterator over elements of type `_`
};
x
}
fn main() {}
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