error[E0261]: use of undeclared lifetime name `'b`
  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:6:37
   |
LL |         + Deref<Target = Self::Item<'b>>;
   |                                     ^^ undeclared lifetime
   |
   = note: for more information on higher-ranked polymorphism, visit https://doc.rust-lang.org/nomicon/hrtb.html
help: consider making the bound lifetime-generic with a new `'b` lifetime
   |
LL |         + for<'b> Deref<Target = Self::Item<'b>>;
   |           +++++++
help: consider introducing lifetime `'b` here
   |
LL |     type Iter<'b, 'a>: Iterator<Item = Self::Item<'a>>
   |               +++
help: consider introducing lifetime `'b` here
   |
LL | trait Iterable<'b> {
   |               ++++

error[E0261]: use of undeclared lifetime name `'undeclared`
  --> $DIR/generic_associated_type_undeclared_lifetimes.rs:9:41
   |
LL |     fn iter<'a>(&'a self) -> Self::Iter<'undeclared>;
   |                                         ^^^^^^^^^^^ undeclared lifetime
   |
help: consider introducing lifetime `'undeclared` here
   |
LL |     fn iter<'undeclared, 'a>(&'a self) -> Self::Iter<'undeclared>;
   |             ++++++++++++
help: consider introducing lifetime `'undeclared` here
   |
LL | trait Iterable<'undeclared> {
   |               +++++++++++++

error: aborting due to 2 previous errors

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