error[E0308]: mismatched types
  --> $DIR/issue-38371.rs:8:8
   |
LL | fn foo(&_a: Foo) {}
   |        ^^^  --- expected due to this
   |        |
   |        expected struct `Foo`, found reference
   |
   = note: expected struct `Foo`
           found reference `&_`
help: to take parameter `_a` by reference, move `&` to the type
   |
LL - fn foo(&_a: Foo) {}
LL + fn foo(_a: &Foo) {}
   |

error[E0308]: mismatched types
  --> $DIR/issue-38371.rs:16:9
   |
LL | fn agh(&&_a: &u32) {}
   |         ^^^  ---- expected due to this
   |         |
   |         expected `u32`, found reference
   |
   = note:   expected type `u32`
           found reference `&_`
help: consider removing `&` from the pattern
   |
LL - fn agh(&&_a: &u32) {}
LL + fn agh(&_a: &u32) {}
   |

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0308`.