error[E0106]: missing lifetime specifier
 --> src/lib.rs:1:28
  |
1 | fn f() -> impl Sized + use<'_> {}
  |                            ^^ expected named lifetime parameter
  |
  = help: this function's return type contains a borrowed value, but there is no value for it to be borrowed from
help: consider using the `'static` lifetime, but this is uncommon unless you're returning a borrowed value from a `const` or a `static`, or if you will only have owned values
  |
1 | fn f() -> impl Sized + use<'static> {}
  |                            ~~~~~~~

error: expected lifetime parameter in `use<...>` precise captures list, found `'_`
 --> src/lib.rs:1:28
  |
1 | fn f() -> impl Sized + use<'_> {}
  |                            ^^