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    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          CONST_BLOCK_PAT
            CONST_KW "const"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                LITERAL
                  INT_NUMBER "15"
                WHITESPACE " "
                R_CURLY "}"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          TUPLE_EXPR
            L_PAREN "("
            R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          CONST_BLOCK_PAT
            CONST_KW "const"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                WHITESPACE " "
                EXPR_STMT
                  CALL_EXPR
                    PATH_EXPR
                      PATH
                        PATH_SEGMENT
                          NAME_REF
                            IDENT "foo"
                    ARG_LIST
                      L_PAREN "("
                      R_PAREN ")"
                  SEMICOLON ";"
                WHITESPACE " "
                CALL_EXPR
                  PATH_EXPR
                    PATH
                      PATH_SEGMENT
                        NAME_REF
                          IDENT "bar"
                  ARG_LIST
                    L_PAREN "("
                    R_PAREN ")"
                WHITESPACE " "
                R_CURLY "}"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          TUPLE_EXPR
            L_PAREN "("
            R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n\n    "
        EXPR_STMT
          MATCH_EXPR
            MATCH_KW "match"
            WHITESPACE " "
            LITERAL
              INT_NUMBER "42"
            WHITESPACE " "
            MATCH_ARM_LIST
              L_CURLY "{"
              WHITESPACE "\n        "
              MATCH_ARM
                RANGE_PAT
                  CONST_BLOCK_PAT
                    CONST_KW "const"
                    WHITESPACE " "
                    BLOCK_EXPR
                      STMT_LIST
                        L_CURLY "{"
                        WHITESPACE " "
                        LITERAL
                          INT_NUMBER "0"
                        WHITESPACE " "
                        R_CURLY "}"
                  WHITESPACE " "
                  DOT2 ".."
                  WHITESPACE " "
                  CONST_BLOCK_PAT
                    CONST_KW "const"
                    WHITESPACE " "
                    BLOCK_EXPR
                      STMT_LIST
                        L_CURLY "{"
                        WHITESPACE " "
                        LITERAL
                          INT_NUMBER "1"
                        WHITESPACE " "
                        R_CURLY "}"
                WHITESPACE " "
                FAT_ARROW "=>"
                WHITESPACE " "
                TUPLE_EXPR
                  L_PAREN "("
                  R_PAREN ")"
                COMMA ","
              WHITESPACE "\n        "
              MATCH_ARM
                RANGE_PAT
                  DOT2 ".."
                  WHITESPACE " "
                  CONST_BLOCK_PAT
                    CONST_KW "const"
                    WHITESPACE " "
                    BLOCK_EXPR
                      STMT_LIST
                        L_CURLY "{"
                        WHITESPACE " "
                        LITERAL
                          INT_NUMBER "0"
                        WHITESPACE " "
                        R_CURLY "}"
                WHITESPACE " "
                FAT_ARROW "=>"
                WHITESPACE " "
                TUPLE_EXPR
                  L_PAREN "("
                  R_PAREN ")"
                COMMA ","
              WHITESPACE "\n        "
              MATCH_ARM
                RANGE_PAT
                  CONST_BLOCK_PAT
                    CONST_KW "const"
                    WHITESPACE " "
                    BLOCK_EXPR
                      STMT_LIST
                        L_CURLY "{"
                        WHITESPACE " "
                        LITERAL
                          INT_NUMBER "2"
                        WHITESPACE " "
                        R_CURLY "}"
                  WHITESPACE " "
                  DOT2 ".."
                WHITESPACE " "
                FAT_ARROW "=>"
                WHITESPACE " "
                TUPLE_EXPR
                  L_PAREN "("
                  R_PAREN ")"
                COMMA ","
              WHITESPACE "\n    "
              R_CURLY "}"
        WHITESPACE "\n\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          TUPLE_PAT
            L_PAREN "("
            CONST_BLOCK_PAT
              CONST_KW "const"
              WHITESPACE " "
              BLOCK_EXPR
                STMT_LIST
                  L_CURLY "{"
                  WHITESPACE " "
                  TUPLE_EXPR
                    L_PAREN "("
                    R_PAREN ")"
                  WHITESPACE " "
                  R_CURLY "}"
            COMMA ","
            R_PAREN ")"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          TUPLE_EXPR
            L_PAREN "("
            R_PAREN ")"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
