SOURCE_FILE@0..28
  FN@0..28
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..4
      IDENT@3..4 "f"
    PARAM_LIST@4..25
      L_PAREN@4..5 "("
      PARAM@5..24
        WILDCARD_PAT@5..6
          UNDERSCORE@5..6 "_"
        COLON@6..7 ":"
        WHITESPACE@7..8 " "
        REF_TYPE@8..24
          AMP@8..9 "&"
          IMPL_TRAIT_TYPE@9..24
            IMPL_KW@9..13 "impl"
            WHITESPACE@13..14 " "
            TYPE_BOUND_LIST@14..24
              TYPE_BOUND@14..16
                LIFETIME@14..16
                  LIFETIME_IDENT@14..16 "'a"
              WHITESPACE@16..17 " "
              PLUS@17..18 "+"
              WHITESPACE@18..19 " "
              TYPE_BOUND@19..24
                PATH_TYPE@19..24
                  PATH@19..24
                    PATH_SEGMENT@19..24
                      NAME_REF@19..24
                        IDENT@19..24 "Sized"
      R_PAREN@24..25 ")"
    WHITESPACE@25..26 " "
    BLOCK_EXPR@26..28
      STMT_LIST@26..28
        L_CURLY@26..27 "{"
        R_CURLY@27..28 "}"
error 9..24: ambiguous `+` in a type