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In the lab just now, with a student tearing their hair out over screenfuls of compiler error messages - too much for the terminal buffer, so scrolling back won't take us to the origin of the issue. I say "Let's redirect all the compiler output to a file and have a look at that". 'wc -l' tells me this file is 33,000 lines long. We have a look and quickly identify the problem. One / from the // comment prefix on line 1 had been accidentally deleted. Gotta love C++.