error[E0107]: struct takes 1 generic argument but 2 generic arguments were supplied
  --> $DIR/typeck_type_placeholder_lifetime_1.rs:9:12
   |
LL |     let c: Foo<_, _> = Foo { r: &5 };
   |            ^^^  --- help: remove the unnecessary generic argument
   |            |
   |            expected 1 generic argument
   |
note: struct defined here, with 1 generic parameter: `T`
  --> $DIR/typeck_type_placeholder_lifetime_1.rs:4:8
   |
LL | struct Foo<'a, T:'a> {
   |        ^^^     -

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0107`.
