X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=blobdiff_plain;f=compiler%2Ftypes%2FType.lhs;h=7c05b6d8c480a3bec6cd105fd619f7d3ccbb9003;hp=bad6144a6d1a60c7e5d85a41fc53821f1ba155ec;hb=9da4639011348fb6c318e3cba4b08622f811d9c4;hpb=a6590d2197b48f7eedee610a95d262d43b517f49

diff --git a/compiler/types/Type.lhs b/compiler/types/Type.lhs
index bad6144..7c05b6d 100644
--- a/compiler/types/Type.lhs
+++ b/compiler/types/Type.lhs
@@ -1028,9 +1028,13 @@ cmpPredX env (IParam n1 ty1) (IParam n2 ty2) = (n1 `compare` n2) `thenCmp` cmpTy
 	-- This comparison is used exclusively (I think) for the
 	-- finite map built in TcSimplify
 cmpPredX env (ClassP c1 tys1) (ClassP c2 tys2) = (c1 `compare` c2) `thenCmp` cmpTypesX env tys1 tys2
-cmpPredX env (IParam _ _)     (ClassP _ _)     = LT
-cmpPredX env (ClassP _ _)     (IParam _ _)     = GT
 cmpPredX env (EqPred ty1 ty2) (EqPred ty1' ty2') = (cmpTypeX env ty1 ty1') `thenCmp` (cmpTypeX env ty2 ty2')
+
+-- Constructor order: IParam < ClassP < EqPred
+cmpPredX env (IParam {})     _		    = LT
+cmpPredX env (ClassP {})    (IParam {})     = GT
+cmpPredX env (ClassP {})    (EqPred {})     = LT
+cmpPredX env (EqPred {})    _		    = GT
 \end{code}
 
 PredTypes are used as a FM key in TcSimplify,