Space leak / quadratic behavior when inlining
Compiling the attached example yields quadratic behavior and a big space leak (eventually the oom killer kills it) during inlining. Tested on both ghc 7.10.3 and 8.0.1
I compiled with
-fforce-recomp --make -O2 -ddump-inlinings Main.hs
In cases where the process was able to run for a while I could see that each chunk of inlinings was getting slower linearly (every minute or so you can hit enter and which the line break go up your terminal a little slower than the last time). I assume the slowdown is due to GC over the growing heap due to a leak, but maybe the inlining algorithm is quadratic.
Apologies if this is a dupe; I had trouble searching for similar issues. (I did find #13316 but don't understand if this could be related)