[GiNaC-list] Suggestion for the FAQ.

Dear all, I think the following should added to the FAQ. Q: I am getting an error message that looks more or less like Internal error: statement in file real/conv/cl_R_to_double.cc, line 55 has been reached!! Please send the authors of the program a description how you produced this error! What should I do? A: This is an error message of the CLN library that GiNaC uses to handle its numerics. The problem usually is that an object was passed to a CLN-function that should have been a number but is not. Your best bet is to check for code that looks like ex_to<numeric>(x) and to check whether x really is a number. The just given code fragment cannot be right if is_a<numeric>(x) yields false. Thanks! Chris