SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        EXPR_STMT
          RECORD_EXPR
            PATH
              PATH_SEGMENT
                NAME_REF
                  IDENT "S"
            WHITESPACE " "
            RECORD_EXPR_FIELD_LIST
              L_CURLY "{"
              WHITESPACE " "
              DOT2 ".."
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "x"
              COMMA ","
              WHITESPACE " "
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        RECORD_EXPR
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "S"
          WHITESPACE " "
          RECORD_EXPR_FIELD_LIST
            L_CURLY "{"
            WHITESPACE " "
            DOT2 ".."
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "x"
            COMMA ","
            WHITESPACE " "
            RECORD_EXPR_FIELD
              NAME_REF
                IDENT "a"
              COLON ":"
              WHITESPACE " "
              LITERAL
                INT_NUMBER "0"
            WHITESPACE " "
            R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
error 22: cannot use a comma after the base struct
error 38: cannot use a comma after the base struct
