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// check-pass
// compile-flags: -Znext-solver
// See https://github.com/rust-lang/trait-system-refactor-initiative/issues/1,
// a minimization of a pattern in core.
trait Iterator {
type Item;
}
struct Flatten<I>(I);
impl<I, U> Iterator for Flatten<I>
where
I: Iterator<Item = U>,
{
type Item = U;
}
fn needs_iterator<I: Iterator>() {}
fn environment<J>()
where
J: Iterator,
{
needs_iterator::<Flatten<J>>();
}
fn main() {}
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