error[E0491]: in type `&'static &'a ()`, reference has a longer lifetime than the data it references
  --> $DIR/rpitit-hidden-types-self-implied-wf-via-param.rs:8:38
   |
LL |     fn extend<'a: 'a>(s: &'a str) -> (Option<&'static &'a ()>, &'static str)
   |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: the pointer is valid for the static lifetime
note: but the referenced data is only valid for the lifetime `'a` as defined here
  --> $DIR/rpitit-hidden-types-self-implied-wf-via-param.rs:8:15
   |
LL |     fn extend<'a: 'a>(s: &'a str) -> (Option<&'static &'a ()>, &'static str)
   |               ^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0491`.