How to debug dump-c invariant violation?

[metamaterialsuit]

I have a huge goto-program that I cannot dump without an invariant violation. Unfortunately, it looks like the logging is pretty minimal and even with verbosity=10 I get no information about which line in the goto binary is causing the problem.

Also, in an odd quirk, somehow dump-cpp works just fine, which is quite annoying.

The problem is at line 630 in dump-c.cpp, so it appears to be a problem with a compound type, but that's not very helpful.