Hello,

...

I have just tried compiling my code with 8.4.2 and using -fmax-pmcheck-iterations=0, I gave GHC 12GB of ram and it still ran out (through `ulimit -v$((1024*1024*12))`).

Hmmm, I'm a bit confused. Why are our results so different? How precisely are you invoking GHC?

Here I meant my whole code, not just the repro. I could have been more clear. Nevertheless, I'm calling it through stack: stack build --ghc-options="-fmax-pmcheck-iterations=0" I have just ran the repro with and without "-fmax-pmcheck-iterations=0" and got similar results to yours.

Let's start with a fresh ticket; #11195 has a rather long history. Do you think you could open it and attach your repro?

Sure thing, will do it tomorrow! Cheers, Victor