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    "
        MATCH_EXPR
          MATCH_KW "match"
          WHITESPACE " "
          RANGE_EXPR
            DOT2 ".."
          WHITESPACE " "
          MATCH_ARM_LIST
            L_CURLY "{"
            WHITESPACE "\n    "
            R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
