Martin> The errors thrown by `scan-lists' is of type `error' Martin> whereas I expected them to be of some more specific Martin> subclass like `syntax-error'. Structured errors are only defined for Lisp in 21.4, but scan-lists is implemented in C. In 21.5, scan-lists does throw syntax-error when parens are not balanced as expected. I don't know how hard it would be to do the same for 21.4. -- Institute of Policy and Planning Sciences http://turnbull.sk.tsukuba.ac.jp University of Tsukuba Tennodai 1-1-1 Tsukuba 305-8573 JAPAN Ask not how you can "do" free software business; ask what your business can "do for" free software.