[rustc.git] / src / test / ui / where-clauses / where-for-self-2.rs

// Test that we can quantify lifetimes outside a constraint (i.e., including
// the self type) in a where clause. Specifically, test that implementing for a
// specific lifetime is not enough to satisfy the `for<'a> ...` constraint, which
// should require *all* lifetimes.

static X: &'static u32 = &42;

trait Bar {
    fn bar(&self);
}

impl Bar for &'static u32 {
    fn bar(&self) {}
}

fn foo<T>(x: &T)
where
    for<'a> &'a T: Bar,
{
}

fn main() {
    foo(&X); //~ ERROR implementation of `Bar` is not general enough
}
Commit	Line	Data
85aaf69f SL	1	// Test that we can quantify lifetimes outside a constraint (i.e., including
85aaf69f SL	2	// the self type) in a where clause. Specifically, test that implementing for a
b7449926	3	// specific lifetime is not enough to satisfy the `for<'a> ...` constraint, which
85aaf69f SL	4	// should require all lifetimes.
	5
	6	static X: &'static u32 = &42;
	7
	8	trait Bar {
	9	fn bar(&self);
	10	}
	11
	12	impl Bar for &'static u32 {
	13	fn bar(&self) {}
	14	}
	15
	16	fn foo<T>(x: &T)
f035d41b XL	17	where
	18	for<'a> &'a T: Bar,
	19	{
	20	}
85aaf69f SL	21
85aaf69f SL	22	fn main() {
f035d41b	23	foo(&X); //~ ERROR implementation of `Bar` is not general enough
85aaf69f	24	}