SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "f"
    GENERIC_PARAM_LIST
      L_ANGLE "<"
      TYPE_PARAM
        NAME
          IDENT "T"
      R_ANGLE ">"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    WHERE_CLAUSE
      WHERE_KW "where"
      WHITESPACE " "
      WHERE_PRED
        PATH_TYPE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "T"
        COLON ":"
        WHITESPACE " "
        TYPE_BOUND_LIST
          QUESTION "?"
      WHERE_PRED
        FOR_BINDER
          FOR_KW "for"
          GENERIC_PARAM_LIST
            L_ANGLE "<"
            R_ANGLE ">"
        WHITESPACE " "
        PATH_TYPE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "Sized"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        R_CURLY "}"
  WHITESPACE "\n"
error 20: expected comma
error 31: expected colon
