Fix AMP warnings.

Authored-by: David Luposchainsky <dluposchainsky@gmail.com>
Signed-off-by: Austin Seipp <austin@well-typed.com>

1 files changed, 9 insertions, 1 deletions

diff --git a/compiler/nativeGen/RegAlloc/Linear/State.hs b/compiler/nativeGen/RegAlloc/Linear/State.hs
index a608a947e7..dc499c9c1f 100644
--- a/compiler/nativeGen/RegAlloc/Linear/State.hs
+++ b/compiler/nativeGen/RegAlloc/Linear/State.hs
@@ -40,13 +40,21 @@ import DynFlags
 import Unique
 import UniqSupply
 
+import Control.Monad (liftM, ap)
+import Control.Applicative (Applicative(..))
+
 
 -- | The register allocator monad type.
 newtype RegM freeRegs a
         = RegM { unReg :: RA_State freeRegs -> (# RA_State freeRegs, a #) }
 
+instance Functor (RegM freeRegs) where
+      fmap = liftM
+
+instance Applicative (RegM freeRegs) where
+      pure = return
+      (<*>) = ap
 
--- | The RegM Monad
 instance Monad (RegM freeRegs) where
   m >>= k   =  RegM $ \s -> case unReg m s of { (# s, a #) -> unReg (k a) s }
   return a  =  RegM $ \s -> (# s, a #)