How many tests does the C# compiler team have? Take a guess, and then go read Gus' post “Testing the C# Compiler”.

Gus used to work for me when I was the C# compiler test lead, and he became test lead when I went to the gray side to be a PM (in case you're wondering, marketing is “the dark side“). The quality of the C# compiler is a testament to his team (though I'll take a small amount of credit for setting some initial direction)...