SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "f"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        EXPR_STMT
          BIN_EXPR
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "v"
            WHITESPACE " "
            EQ "="
            WHITESPACE " "
            BIN_EXPR
              BLOCK_EXPR
                STMT_LIST
                  L_CURLY "{"
                  LITERAL
                    INT_NUMBER "1"
                  R_CURLY "}"
              AMP "&"
              LITERAL
                INT_NUMBER "2"
          SEMICOLON ";"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
