error[E0261]: use of undeclared lifetime name `'b`
  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:8:37
   |
LL |         + Deref<Target = Self::Item<'b>>;
   |                                     ^^ undeclared lifetime
   |
   = help: if you want to experiment with in-band lifetime bindings, add `#![feature(in_band_lifetimes)]` to the crate attributes
help: consider introducing lifetime `'b` here
   |
LL | trait Iterable<'b> {
   |               ++++
help: consider introducing lifetime `'b` here
   |
LL |     type Iter<'b, 'a>: Iterator<Item = Self::Item<'a>>
   |               +++

error[E0261]: use of undeclared lifetime name `'undeclared`
  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:11:41
   |
LL |     fn iter<'a>(&'a self) -> Self::Iter<'undeclared>;
   |                                         ^^^^^^^^^^^ undeclared lifetime
   |
   = help: if you want to experiment with in-band lifetime bindings, add `#![feature(in_band_lifetimes)]` to the crate attributes
help: consider introducing lifetime `'undeclared` here
   |
LL | trait Iterable<'undeclared> {
   |               +++++++++++++
help: consider introducing lifetime `'undeclared` here
   |
LL |     fn iter<'undeclared, 'a>(&'a self) -> Self::Iter<'undeclared>;
   |             ++++++++++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0261`.