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 " "
            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 19: expected DOT2
