Add MHS as a recognized compiler.

Author: augustss

Cabal-syntax/src/Distribution/Compiler.hs

@@ -75,6 +75,7 @@ data CompilerFlavor
   | LHC
   | UHC
   | Eta
+  | MHS
   | HaskellSuite String -- string is the id of the actual compiler
   | OtherCompiler String
   deriving (Generic, Show, Read, Eq, Ord, Typeable, Data)
@@ -85,7 +86,7 @@ instance NFData CompilerFlavor where rnf = genericRnf
 
 knownCompilerFlavors :: [CompilerFlavor]
 knownCompilerFlavors =
-  [GHC, GHCJS, NHC, YHC, Hugs, HBC, Helium, JHC, LHC, UHC, Eta]
+  [GHC, GHCJS, NHC, YHC, Hugs, HBC, Helium, JHC, LHC, UHC, Eta, MHS]
 
 instance Pretty CompilerFlavor where
   pretty (OtherCompiler name) = Disp.text name