error[E0623]: lifetime mismatch
  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:10:46
   |
LL |     fn a(self: Pin<&Foo>, f: &Foo) -> &Foo { f }
   |                              ----     ----   ^ ...but data from `f` is returned here
   |                              |
   |                              this parameter and the return type are declared with different lifetimes...
   |
   = note: each elided lifetime in input position becomes a distinct lifetime
help: consider introducing a named lifetime parameter and update trait if needed
   |
LL |     fn a<'a>(self: Pin<&'a Foo>, f: &'a Foo) -> &Foo { f }
   |         ++++            ++           ++

error[E0623]: lifetime mismatch
  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:14:76
   |
LL |     fn c(self: Pin<&Self>, f: &Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
   |                               ----              -----------------          ^ ...but data from `f` is returned here
   |                               |
   |                               this parameter and the return type are declared with different lifetimes...
   |
   = note: each elided lifetime in input position becomes a distinct lifetime
help: consider introducing a named lifetime parameter and update trait if needed
   |
LL |     fn c<'a>(self: Pin<&'a Self>, f: &'a Foo, g: &Foo) -> (Pin<&Foo>, &Foo) { (self, f) }
   |         ++++            ++            ++

error[E0623]: lifetime mismatch
  --> $DIR/arbitrary_self_types_pin_lifetime_mismatch.rs:21:58
   |
LL |     fn bar<'a>(self: Alias<&Self>, arg: &'a ()) -> &() { arg }
   |                                         ------     ---   ^^^ ...but data from `arg` is returned here
   |                                         |
   |                                         this parameter and the return type are declared with different lifetimes...

error: aborting due to 3 previous errors

For more information about this error, try `rustc --explain E0623`.