error[E0263]: lifetime name `'a` declared twice in the same scope
  --> $DIR/regions-name-duplicated.rs:1:16
   |
LL | struct Foo<'a, 'a> {
   |            --  ^^ lifetime `'a` already in scope
   |            |
   |            first declared here

error[E0392]: parameter `'a` is never used
  --> $DIR/regions-name-duplicated.rs:1:12
   |
LL | struct Foo<'a, 'a> {
   |            ^^ unused parameter
   |
   = help: consider removing `'a`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0263, E0392.
For more information about an error, try `rustc --explain E0263`.