error[E0106]: missing lifetime specifier
  --> $DIR/missing-lt-for-hrtb.rs:2:32
   |
LL | struct S<'a>(&'a dyn Fn(&X) -> &X);
   |                         --     ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say which one of argument 1's 2 lifetimes it is borrowed from
   = 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 | struct S<'a>(&'a dyn for<'b> Fn(&'b X) -> &'b X);
   |                      +++++++    ~~~~~     ~~~
help: consider using the `'a` lifetime
   |
LL | struct S<'a>(&'a dyn Fn(&X) -> &'a X);
   |                                ~~~

error[E0106]: missing lifetime specifier
  --> $DIR/missing-lt-for-hrtb.rs:2:33
   |
LL | struct S<'a>(&'a dyn Fn(&X) -> &X);
   |                         --      ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say which one of argument 1's 2 lifetimes it is borrowed from
   = 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 | struct S<'a>(&'a dyn for<'b> Fn(&'b X) -> &X<'b>);
   |                      +++++++    ~~~~~      ~~~~~
help: consider using the `'a` lifetime
   |
LL | struct S<'a>(&'a dyn Fn(&X) -> &X<'a>);
   |                                 ~~~~~

error[E0106]: missing lifetime specifier
  --> $DIR/missing-lt-for-hrtb.rs:5:40
   |
LL | struct V<'a>(&'a dyn for<'b> Fn(&X) -> &X);
   |                                 --     ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say which one of argument 1's 2 lifetimes it is borrowed from
note: these named lifetimes are available to use
  --> $DIR/missing-lt-for-hrtb.rs:5:10
   |
LL | struct V<'a>(&'a dyn for<'b> Fn(&X) -> &X);
   |          ^^              ^^
help: consider using one of the available lifetimes here
   |
LL | struct V<'a>(&'a dyn for<'b> Fn(&X) -> &'lifetime X);
   |                                         +++++++++

error[E0106]: missing lifetime specifier
  --> $DIR/missing-lt-for-hrtb.rs:5:41
   |
LL | struct V<'a>(&'a dyn for<'b> Fn(&X) -> &X);
   |                                 --      ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say which one of argument 1's 2 lifetimes it is borrowed from
note: these named lifetimes are available to use
  --> $DIR/missing-lt-for-hrtb.rs:5:10
   |
LL | struct V<'a>(&'a dyn for<'b> Fn(&X) -> &X);
   |          ^^              ^^

error: aborting due to 4 previous errors

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