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
}