error: unsatisfied lifetime constraints
  --> $DIR/wf-static-method.rs:27:9
   |
LL | impl<'a, 'b> Foo<'a, 'b, Evil<'a, 'b>> for () {
   |      --  -- lifetime `'b` defined here
   |      |
   |      lifetime `'a` defined here
...
LL |         u //~ ERROR E0312
   |         ^ returning this value requires that `'b` must outlive `'a`

error: unsatisfied lifetime constraints
  --> $DIR/wf-static-method.rs:43:9
   |
LL | impl<'a, 'b> Evil<'a, 'b> {
   |      --  -- lifetime `'b` defined here
   |      |
   |      lifetime `'a` defined here
LL |     fn inherent_evil(u: &'b u32) -> &'a u32 {
LL |         u //~ ERROR E0312
   |         ^ returning this value requires that `'b` must outlive `'a`

error: aborting due to 2 previous errors