error[E0106]: missing lifetime specifier
  --> $DIR/ref-self-multi.rs:18:56
   |
LL |     fn ref_box_ref_Self(self: &Box<&Self>, f: &u32) -> &u32 {
   |                               -----------     ----     ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from one of `self`'s 2 lifetimes or `f`
help: consider introducing a named lifetime parameter
   |
LL |     fn ref_box_ref_Self<'a>(self: &'a Box<&'a Self>, f: &'a u32) -> &'a u32 {
   |                        ++++        ++      ++            ++          ++

error[E0106]: missing lifetime specifier
  --> $DIR/ref-self-multi.rs:23:63
   |
LL |     fn ref_wrap_ref_Self(self: &Wrap<&Self, u32>, f: &u32) -> &u32 {
   |                                -----------------     ----     ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say whether it is borrowed from one of `self`'s 2 lifetimes or `f`
help: consider introducing a named lifetime parameter
   |
LL |     fn ref_wrap_ref_Self<'a>(self: &'a Wrap<&'a Self, u32>, f: &'a u32) -> &'a u32 {
   |                         ++++        ++       ++                 ++          ++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0106`.