Silence GHC 8.8 related noise for now

And we'll cross that StarIsType bridge when we get there...

Author: hvr

cassava.cabal

@@ -123,7 +123,11 @@ Library
 
   -- https://ghc.haskell.org/trac/ghc/wiki/Migration/8.0#Recommendationsforforward-compatibility
   if impl(ghc >= 8.0)
-    ghc-options: -Wcompat -Wnoncanonical-monad-instances -Wnoncanonical-monadfail-instances
+    ghc-options: -Wcompat -Wnoncanonical-monad-instances
+    if impl(ghc >= 8.8)
+      ghc-options: -Wno-star-is-type
+    else
+      ghc-options: -Wnoncanonical-monadfail-instances
   else
     -- provide/emulate `Control.Monad.Fail` and `Data.Semigroups` API for pre-GHC8
     build-depends: fail == 4.9.*, semigroups >= 0.18.2 && <0.20