1 // compile-flags:-Zverbose
4 #![feature(rustc_attrs)]
8 fn with_signature<'a, T, F>(x: Box<T>, op: F) -> Box<dyn Debug + 'a>
9 where F: FnOnce(Box<T>) -> Box<dyn Debug + 'a>
15 fn no_region<'a, T>(x: Box<T>) -> Box<dyn Debug + 'a>
19 // Here, the closure winds up being required to prove that `T:
20 // 'a`. In principle, it could know that, except that it is
21 // type-checked in a fully generic way, and hence it winds up with
22 // a propagated requirement that `T: '_#2`, where `'_#2` appears
23 // in the return type. The caller makes the mapping from `'_#2` to
24 // `'a` (and subsequently reports an error).
26 with_signature(x, |y| y)
27 //~^ ERROR the parameter type `T` may not live long enough
30 fn correct_region<'a, T>(x: Box<T>) -> Box<Debug + 'a>
37 fn wrong_region<'a, 'b, T>(x: Box<T>) -> Box<Debug + 'a>
42 //~^ ERROR the parameter type `T` may not live long enough
45 fn outlives_region<'a, 'b, T>(x: Box<T>) -> Box<Debug + 'a>