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    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          IDENT_PAT
            NAME
              IDENT "x"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          RANGE_EXPR
            LITERAL
              INT_NUMBER "1"
            DOT2 ".."
          SEMICOLON ";"
        WHITESPACE "\n    "
        EXPR_STMT
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            RANGE_EXPR
              LITERAL
                INT_NUMBER "1"
              DOT2 ".."
            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 " "
            RANGE_EXPR
              METHOD_CALL_EXPR
                PATH_EXPR
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "a"
                DOT "."
                NAME_REF
                  IDENT "b"
                ARG_LIST
                  L_PAREN "("
                  R_PAREN ")"
              DOT2 ".."
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "S"
            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"
        R_CURLY "}"
  WHITESPACE "\n"
