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
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            TUPLE_EXPR
              L_PAREN "("
              R_PAREN ")"
            WHITESPACE " "
            MATCH_ARM_LIST
              L_CURLY "{"
              WHITESPACE " "
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "S"
            WHITESPACE " "
            MATCH_ARM_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                R_CURLY "}"
            WHITESPACE " "
            MATCH_ARM_LIST
              L_CURLY "{"
              WHITESPACE " "
              MATCH_ARM
                WILDCARD_PAT
                  UNDERSCORE "_"
                WHITESPACE " "
                FAT_ARROW "=>"
                WHITESPACE " "
                TUPLE_EXPR
                  L_PAREN "("
                  R_PAREN ")"
              WHITESPACE " "
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                RECORD_EXPR
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "S"
                  WHITESPACE " "
                  RECORD_EXPR_FIELD_LIST
                    L_CURLY "{"
                    R_CURLY "}"
                WHITESPACE " "
                R_CURLY "}"
            WHITESPACE " "
            MATCH_ARM_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
