[lispm]

Actually these errors are relatively easy to spot and and often there are solutions for that. Sometimes a compiler might need to be hacked on. The good thing: the compiler is written in Lisp and debugging is possible.

The more nasty errors are lurking for example in the GC... there we move into C and assembler land...

Most platforms have nasty errors. With popular platforms one can hope that many of these have be found and somebody has fixed them already. With language/runtimes which are no so widespread in production one is more likely to find these problems oneself. Especially in more complex runtimes.