I saw that back in the nineties: my employee had an interviewing task where you had to look at a c++ listing with obvious errors, the task was to find the errors, like memory leaks, buffer overruns, use of stack allocated memory, etc. Actually few candidates would pass this test...

I don't think they will do this: the interviewing process at most places seems to emulate that of the industry leader, nowadays that's google, correct me if I am wrong.