I was porting some C code to D the other day.  It had a switch-case statement in it, and to my surprise the compiler complained about a case that could fall through unintentionally.  Lo and behold, it was a bug! I was so happy to see this happen.  It really made my day.

So I wanted to drop by and say "thank you".  Thank you Walter for putting this in, and thank you whoever convinced Walter to accept that patch/pull ;)

It's a major source of bugs defeated, and now I don't have to use long chains of if-else-if-else statements every time I want to do some n-ary choice in D (which is a habit I've picked up in languages with the switch-case pitfall).  Awesome!