vlib/v/parser/tests/anon_fn_return_type.vv:7:22: error: expected return type, not string `hi` for anonymous function
    5 | _ = fn (name string) flag.Flag
    6 | _ = fn (name string) flag.Flag {return flag.Flag{}}
    7 | _ = fn (name string) "hi" + name
      |                      ~~~~
    8 |
