error[E0106]: missing lifetime specifier
  --> $DIR/issue-26638.rs:1:62
   |
LL | fn parse_type(iter: Box<dyn Iterator<Item=&str>+'static>) -> &str { iter.next() }
   |                     ------------------------------------     ^ expected named lifetime parameter
   |
   = help: this function's return type contains a borrowed value, but the signature does not say which one of `iter`'s 2 lifetimes it is borrowed from
help: consider introducing a named lifetime parameter
   |
LL | fn parse_type<'a>(iter: Box<dyn Iterator<Item=&'a str>+'static>) -> &'a str { iter.next() }
   |              ++++                              ++                    ++

error[E0106]: missing lifetime specifier
  --> $DIR/issue-26638.rs:4:40
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> &str { iter() }
   |                                        ^ 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`
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> &'static str { iter() }
   |                                         +++++++
help: instead, you are more likely to want to change the argument to be borrowed...
   |
LL | fn parse_type_2(iter: &fn(&u8)->&u8) -> &str { iter() }
   |                       +
help: ...or alternatively, you might want to return an owned value
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> String { iter() }
   |                                        ~~~~~~

error[E0106]: missing lifetime specifier
  --> $DIR/issue-26638.rs:9:22
   |
LL | fn parse_type_3() -> &str { unimplemented!() }
   |                      ^ 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`
   |
LL | fn parse_type_3() -> &'static str { unimplemented!() }
   |                       +++++++
help: instead, you are more likely to want to return an owned value
   |
LL | fn parse_type_3() -> String { unimplemented!() }
   |                      ~~~~~~

error[E0061]: this function takes 1 argument but 0 arguments were supplied
  --> $DIR/issue-26638.rs:4:47
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> &str { iter() }
   |                                               ^^^^-- an argument of type `&u8` is missing
   |
help: provide the argument
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> &str { iter(/* &u8 */) }
   |                                                   ~~~~~~~~~~~

error[E0308]: mismatched types
  --> $DIR/issue-26638.rs:4:47
   |
LL | fn parse_type_2(iter: fn(&u8)->&u8) -> &str { iter() }
   |                                        ----   ^^^^^^ expected `&str`, found `&u8`
   |                                        |
   |                                        expected `&'static str` because of return type
   |
   = note: expected reference `&'static str`
              found reference `&u8`

error: aborting due to 5 previous errors

Some errors have detailed explanations: E0061, E0106, E0308.
For more information about an error, try `rustc --explain E0061`.