See also http://pvp.haskell.org/faq

0.95.2.1

• Allow base-4.15 (GHC 9.0)

• Workaround for {-# LANGUAGE Haskell2010 #-} parser regression introduced in GHC 9.0

• Optimization flag -O2 has been removed

0.95.2.0

• Declare Text.Regex module Trustworthy under SafeHaskell