GHC 8.8 heap overflow regression
The following program throws a heap overflow if you compile it with optimization on GHC 8.8 and HEAD:
module Bug where import Data.Bits (setBit) f :: Int f = foldl setter 0 $ zip [0..] [()] where setter v (ix, _) = setBit v ix
$ ~/Software/ghc3/inplace/bin/ghc-stage2 -fforce-recomp -O Bug.hs [1 of 1] Compiling Bug ( Bug.hs, Bug.o ) ghc-stage2: panic! (the 'impossible' happened) (GHC version 8.9.20190309 for x86_64-unknown-linux): heap overflow
This does not happen with GHC 8.6.4.
FontyFruity package on Hackage fails to build on GHC HEAD due to this regression.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information