Mixed absolute-relative import is allowed in use delcaration

[matklad]

This compiles, though it probably should not:

use ::self::foo::bar;

mod foo {
    pub fn bar() {}
}

fn main() {}

[petrochenkov]

This was fixed in #32403, however it's temporarily reported as a warning for backward compatibility.

[matklad]

Ah yes, I should have checked this on nightly, thanks!