in reply to
Re: Error ... at (eval 75) line 7974.
in thread Error ... at (eval 75) line 7974.
The main problem is finding the particular call to the string eval that is causing the problem
If you run the script under the debugger (perl -d), it'll give the location of the relevant eval in the error message; locating the offending dereference is then just a matter of arithmetic.
It feels like there should be an even more convenient way to do this -- some combination of command-line options that would produce the more informative error message without going through the interactive debugger -- but I personally don't know of one.