CoWorker: I fixed the code so it doesn't throw any errors or warnings anymore.

What He did? Well.. he just commented the whole important part and it's my turn now to really fix this C mess.

Well its a better solution than my former college who just wrapped the failing code in a try catch with empty catch :/

We are still, one year after he quit, finding places that silently fails.

Many times without notice to the user so the only indication there is a problem is when a user realizes that some change never happened.

But this is often days after the actual error and all but impossible to debug until you find the catch and start logging the exception.