// Simplified regression test for #30438, inspired by arielb1. trait Trait { type Out; } struct Test<'a> { s: &'a str } fn silly<'y, 'z>(_s: &'y Test<'z>) -> &'y as Trait>::Out where 'z: 'static { let x = Test { s: "this cannot last" }; &x //~^ ERROR: `x` does not live long enough } impl<'b> Trait for Test<'b> { type Out = Test<'b>; } fn main() { let orig = Test { s: "Hello World" }; let r = silly(&orig); println!("{}", orig.s); // OK since `orig` is valid println!("{}", r.s); // Segfault (method does not return a sane value) }