error[E0261]: use of undeclared lifetime name `'b`
  --> $DIR/nested-rpit-hrtb.rs:56:77
   |
LL | fn two_htrb_outlives() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Sized + '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 | fn two_htrb_outlives() -> impl for<'b, 'a> Foo<'a, Assoc = impl for<'b> Sized + 'b> {}
   |                                    +++
help: consider introducing lifetime `'b` here
   |
LL | fn two_htrb_outlives<'b>() -> impl for<'a> Foo<'a, Assoc = impl for<'b> Sized + 'b> {}
   |                     ++++

error[E0261]: use of undeclared lifetime name `'b`
  --> $DIR/nested-rpit-hrtb.rs:64:82
   |
LL | fn two_htrb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
   |                                                                                  ^^ undeclared lifetime
   |
help: consider making the bound lifetime-generic with a new `'b` lifetime
   |
LL | fn two_htrb_outlives_uses() -> impl for<'b, 'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
   |                                         +++
help: consider introducing lifetime `'b` here
   |
LL | fn two_htrb_outlives_uses<'b>() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Sized + 'b> {}
   |                          ++++

error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait`
  --> $DIR/nested-rpit-hrtb.rs:25:69
   |
LL | fn one_hrtb_outlives() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'a> {}
   |                                                                     ^^
   |
note: lifetime declared here
  --> $DIR/nested-rpit-hrtb.rs:25:36
   |
LL | fn one_hrtb_outlives() -> impl for<'a> Foo<'a, Assoc = impl Sized + 'a> {}
   |                                    ^^

error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait`
  --> $DIR/nested-rpit-hrtb.rs:29:68
   |
LL | fn one_hrtb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl Qux<'a>> {}
   |                                                                    ^^
   |
note: lifetime declared here
  --> $DIR/nested-rpit-hrtb.rs:29:39
   |
LL | fn one_hrtb_trait_param() -> impl for<'a> Foo<'a, Assoc = impl Qux<'a>> {}
   |                                       ^^

error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait`
  --> $DIR/nested-rpit-hrtb.rs:32:74
   |
LL | fn one_hrtb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'a> {}
   |                                                                          ^^
   |
note: lifetime declared here
  --> $DIR/nested-rpit-hrtb.rs:32:41
   |
LL | fn one_hrtb_outlives_uses() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'a> {}
   |                                         ^^

error[E0657]: `impl Trait` cannot capture higher-ranked lifetime from outer `impl Trait`
  --> $DIR/nested-rpit-hrtb.rs:35:73
   |
LL | fn one_hrtb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl Qux<'a>> {}
   |                                                                         ^^
   |
note: lifetime declared here
  --> $DIR/nested-rpit-hrtb.rs:35:44
   |
LL | fn one_hrtb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl Qux<'a>> {}
   |                                            ^^

error[E0277]: the trait bound `for<'a> &'a (): Qux<'b>` is not satisfied
  --> $DIR/nested-rpit-hrtb.rs:45:79
   |
LL | fn one_hrtb_mention_fn_trait_param_uses<'b>() -> impl for<'a> Bar<'a, Assoc = impl Qux<'b>> {}
   |                                                                               ^^^^^^^^^^^^ the trait `for<'a> Qux<'b>` is not implemented for `&'a ()`
   |
   = help: the trait `Qux<'_>` is implemented for `()`
   = help: for that trait implementation, expected `()`, found `&'a ()`

error: implementation of `Bar` is not general enough
  --> $DIR/nested-rpit-hrtb.rs:49:93
   |
LL | fn one_hrtb_mention_fn_outlives_uses<'b>() -> impl for<'a> Bar<'a, Assoc = impl Sized + 'b> {}
   |                                                                                             ^^ implementation of `Bar` is not general enough
   |
   = note: `()` must implement `Bar<'a>`
   = note: ...but it actually implements `Bar<'0>`, for some specific lifetime `'0`

error[E0277]: the trait bound `for<'a, 'b> &'a (): Qux<'b>` is not satisfied
  --> $DIR/nested-rpit-hrtb.rs:60:64
   |
LL | fn two_htrb_trait_param_uses() -> impl for<'a> Bar<'a, Assoc = impl for<'b> Qux<'b>> {}
   |                                                                ^^^^^^^^^^^^^^^^^^^^ the trait `for<'a, 'b> Qux<'b>` is not implemented for `&'a ()`
   |
   = help: the trait `Qux<'_>` is implemented for `()`
   = help: for that trait implementation, expected `()`, found `&'a ()`

error: aborting due to 9 previous errors

Some errors have detailed explanations: E0261, E0277, E0657.
For more information about an error, try `rustc --explain E0261`.