error[E0107]: missing generics for associated type `X::Y`
  --> $DIR/missing_lifetime_args.rs:11:32
   |
LL | fn foo<'c, 'd>(_arg: Box<dyn X<Y = (&'c u32, &'d u32)>>) {}
   |                                ^ expected 2 lifetime arguments
   |
note: associated type defined here, with 2 lifetime parameters: `'a`, `'b`
  --> $DIR/missing_lifetime_args.rs:2:10
   |
LL |     type Y<'a, 'b>;
   |          ^ --  --
help: add missing lifetime arguments
   |
LL | fn foo<'c, 'd>(_arg: Box<dyn X<Y<'_, '_> = (&'c u32, &'d u32)>>) {}
   |                                 ++++++++

error[E0107]: struct takes 3 lifetime arguments but 2 lifetime arguments were supplied
  --> $DIR/missing_lifetime_args.rs:14:26
   |
LL | fn bar<'a, 'b, 'c>(_arg: Foo<'a, 'b>) {}
   |                          ^^^ --  -- supplied 2 lifetime arguments
   |                          |
   |                          expected 3 lifetime arguments
   |
note: struct defined here, with 3 lifetime parameters: `'a`, `'b`, `'c`
  --> $DIR/missing_lifetime_args.rs:5:8
   |
LL | struct Foo<'a, 'b, 'c> {
   |        ^^^ --  --  --
help: add missing lifetime argument
   |
LL | fn bar<'a, 'b, 'c>(_arg: Foo<'a, 'b, 'a>) {}
   |                                    ++++

error[E0107]: struct takes 3 lifetime arguments but 1 lifetime argument was supplied
  --> $DIR/missing_lifetime_args.rs:17:16
   |
LL | fn f<'a>(_arg: Foo<'a>) {}
   |                ^^^ -- supplied 1 lifetime argument
   |                |
   |                expected 3 lifetime arguments
   |
note: struct defined here, with 3 lifetime parameters: `'a`, `'b`, `'c`
  --> $DIR/missing_lifetime_args.rs:5:8
   |
LL | struct Foo<'a, 'b, 'c> {
   |        ^^^ --  --  --
help: add missing lifetime arguments
   |
LL | fn f<'a>(_arg: Foo<'a, 'a, 'a>) {}
   |                      ++++++++

error: aborting due to 3 previous errors

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