For every class with a required language, it was not taught during class. 

We did have the oblig "learn language X" course. Which used to be C and had just switched to Java at our uni. But it was just to learn a language.

The Operating System class used Minix in a VM to teach concepts. You were expected to just use a Minix vi (that was fun!) or somehow figure out yourself how to best use something outside while still having a fast enough feedback loop. Nobody taught us C (since we were already a Java language year. You were just expected to figure it out. Quite a bunch of people couldn't and literally quit CS entirely over that course. I loved it!). We had to add a memory compactification algorithm to Minix to pass the course. That was a fun learning experience! And made me appreciate modern (well, I guess this was like 25 years ago now lol!) operating systems.

Scripting languages course: Pick one and do a project and turn it in. That was it. (I turned in something I had written in Perl as a side-job for hire and got an A without doing any course work at all (except for the two initial attendance checked classes)