warning: unnecessary lifetime parameter `'a`
  --> $DIR/regions-static-bound-rpass.rs:5:17
   |
LL | fn invariant_id<'a,'b>(t: &'b mut &'static ()) -> &'b mut &'a ()
   |                 ^^
   |
   = note: you can use the `'static` lifetime directly, in place of `'a`
note: the lint level is defined here
  --> $DIR/regions-static-bound-rpass.rs:3:9
   |
LL | #![warn(redundant_lifetimes)]
   |         ^^^^^^^^^^^^^^^^^^^

warning: unnecessary lifetime parameter `'a`
  --> $DIR/regions-static-bound-rpass.rs:9:14
   |
LL | fn static_id<'a>(t: &'a ()) -> &'static ()
   |              ^^
   |
   = note: you can use the `'static` lifetime directly, in place of `'a`

warning: unnecessary lifetime parameter `'a`
  --> $DIR/regions-static-bound-rpass.rs:13:23
   |
LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
   |                       ^^
   |
   = note: you can use the `'static` lifetime directly, in place of `'a`

warning: unnecessary lifetime parameter `'b`
  --> $DIR/regions-static-bound-rpass.rs:13:26
   |
LL | fn static_id_indirect<'a,'b>(t: &'a ()) -> &'static ()
   |                          ^^
   |
   = note: you can use the `'static` lifetime directly, in place of `'b`

warning: 4 warnings emitted