error[E0283]: type annotations needed: cannot satisfy `&'a (): Foo`
  --> $DIR/issue-34979.rs:6:13
   |
LL |     &'a (): Foo,
   |             ^^^
   |
note: multiple `impl`s or `where` clauses satisfying `&'a (): Foo` found
  --> $DIR/issue-34979.rs:2:1
   |
LL | impl<'a, T> Foo for &'a T {}
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
...
LL |     &'a (): Foo,
   |             ^^^
LL |     &'static (): Foo;
   |                  ^^^

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0283`.