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// build-pass (FIXME(62277): could be check-pass?)
// Regression test related to #56288. Check that a supertrait projection (of
// `Output`) that references `Self` can be ok if it is referencing a projection (of
// `Self::Target`, in this case). Note that we still require the user to manually
// specify both `Target` and `Output` for now.
trait Base {
type Output;
trait Helper: Base<Output=<Self as Helper>::Target> {
type Target;
impl Base for u32
type Output = i32;
impl Helper for u32
type Target = i32;
fn main() {
let _x: Box<dyn Helper<Target=i32, Output=i32>> = Box::new(2u32);
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