X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=compiler%2Ftypecheck%2FTcInteract.lhs;h=fd66d0ac0ce6d3d8245f863e33d1cdc429f163f3;hb=fe58dd2f091f5a4a0e83a5ec6da643a6711e3aed;hp=f789e6f655019a010bef4296919e05714eaf548a;hpb=fdf8656855d26105ff36bdd24d41827b05037b91;p=ghc-hetmet.git

diff --git a/compiler/typecheck/TcInteract.lhs b/compiler/typecheck/TcInteract.lhs
index f789e6f..fd66d0a 100644
--- a/compiler/typecheck/TcInteract.lhs
+++ b/compiler/typecheck/TcInteract.lhs
@@ -1046,9 +1046,16 @@ doInteractWithInert (CIPCan { cc_id = id1, cc_flavor = ifl, cc_ip_nm = nm1, cc_i
   | nm1 == nm2
   =  	-- See Note [When improvement happens]
     do { co_var <- newCoVar ty2 ty1 -- See Note [Efficient Orientation]
-       ; let flav = Wanted (combineCtLoc ifl wfl) 
-       ; cans <- mkCanonical flav co_var 
-       ; mkIRContinue "IP/IP fundep" workItem KeepInert cans }
+       ; let flav = Wanted (combineCtLoc ifl wfl)
+       ; cans <- mkCanonical flav co_var
+       ; case wfl of
+           Given   {} -> pprPanic "Unexpected given IP" (ppr workItem)
+           Derived {} -> pprPanic "Unexpected derived IP" (ppr workItem)
+           Wanted  {} ->
+               do { setIPBind (cc_id workItem) $
+                    EvCast id1 (mkSymCo (mkCoVarCo co_var))
+                  ; mkIRStopK "IP/IP interaction (solved)" cans }
+       }
 
 -- Never rewrite a given with a wanted equality, and a type function
 -- equality can never rewrite an equality. We rewrite LHS *and* RHS