rust/src/test/ui/issues/issue-20413.rs

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trait Foo {
fn answer(self);
}
struct NoData<T>;
//~^ ERROR: parameter `T` is never used
impl<T> Foo for T where NoData<T>: Foo {
//~^ ERROR: overflow evaluating the requirement
fn answer(self) {
let val: NoData<T> = NoData;
}
}
fn main() {}