[rustc.git] / src / test / ui / issues / issue-54302.rs

trait Deserialize<'de> {}

trait DeserializeOwned: for<'de> Deserialize<'de> {}
impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}

// Based on this impl, `&'static str` only implements Deserialize<'static>.
// It does not implement for<'de> Deserialize<'de>.
impl<'de: 'a, 'a> Deserialize<'de> for &'a str {}

fn main() {
    // Then why does it implement DeserializeOwned? This compiles.
    fn assert_deserialize_owned<T: DeserializeOwned>() {}
    assert_deserialize_owned::<&'static str>();
    //~^ ERROR not general enough

    // It correctly does not implement for<'de> Deserialize<'de>.
    //fn assert_hrtb<T: for<'de> Deserialize<'de>>() {}
    //assert_hrtb::<&'static str>();
}
Commit	Line	Data
0bf4aa26 XL	1	trait Deserialize<'de> {}
	2
	3	trait DeserializeOwned: for<'de> Deserialize<'de> {}
	4	impl<T> DeserializeOwned for T where T: for<'de> Deserialize<'de> {}
	5
	6	// Based on this impl, `&'static str` only implements Deserialize<'static>.
	7	// It does not implement for<'de> Deserialize<'de>.
	8	impl<'de: 'a, 'a> Deserialize<'de> for &'a str {}
	9
	10	fn main() {
	11	// Then why does it implement DeserializeOwned? This compiles.
	12	fn assert_deserialize_owned<T: DeserializeOwned>() {}
	13	assert_deserialize_owned::<&'static str>();
0731742a	14	//~^ ERROR not general enough
0bf4aa26 XL	15
	16	// It correctly does not implement for<'de> Deserialize<'de>.
	17	//fn assert_hrtb<T: for<'de> Deserialize<'de>>() {}
	18	//assert_hrtb::<&'static str>();
	19	}