SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "main"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        RECORD_EXPR
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "S"
          WHITESPACE " "
          RECORD_EXPR_FIELD_LIST
            L_CURLY "{"
            WHITESPACE " "
            RECORD_EXPR_FIELD
              NAME_REF
                IDENT "field"
              WHITESPACE " "
              RANGE_EXPR
                DOT2 ".."
                CALL_EXPR
                  PATH_EXPR
                    PATH
                      PATH
                        PATH_SEGMENT
                          NAME_REF
                            IDENT "S"
                      COLON2 "::"
                      PATH_SEGMENT
                        NAME_REF
                          IDENT "default"
                  ARG_LIST
                    L_PAREN "("
                    R_PAREN ")"
            WHITESPACE " "
            R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
error 25: expected COLON
