cabal: document that TypeSynonymInstances is still needed for ghc 7.0

andreasabel · andreasabel · commit 6b6fcf270a02 · 2021-07-19T14:29:58.000+02:00
diff --git a/regex-posix.cabal b/regex-posix.cabal
@@ -85,6 +85,7 @@ library
       GeneralizedNewtypeDeriving
       FlexibleContexts
       TypeSynonymInstances
+         -- ^ for ghc 7.0, subsumed under FlexibleInstances later
       FlexibleInstances
 
   build-depends: regex-base == 0.94.*
