Hi devs,

I almost exclusively work with a DEBUG compiler. It continually shocks me that 
I'm relatively alone in this stance, as the ASSERTs littered throughout GHC 
have caught many a bug in easier a manner than long stares at -ddump-tc-trace 
would do. In any case, my goal in this email is not to convince you to follow 
suit. My goal is to request that our CI infrastructure include at least one 
testsuite run in a DEBUG compiler. A patch I'm working on is failing a test 
because of an assertion failure. I doubt my patch is the culprit, but I also 
can't categorically rule it out. So, I'm left rebuilding HEAD with DEBUG turned 
on to see if I can repro the ASSERTion failure. Clearly, having a CI trace of 
this would simplify things -- not to mention catch bugs earlier.

Thanks!
Richard
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