Trace more vectorisation failures

[ghc-hetmet.git] / compiler / vectorise / VectUtils.hs

diff --git a/compiler/vectorise/VectUtils.hs b/compiler/vectorise/VectUtils.hs
index 27dd330..df8c23f 100644 (file)
--- a/compiler/vectorise/VectUtils.hs
+++ b/compiler/vectorise/VectUtils.hs
@@ -140,7 +140,7 @@ paDictOfTyApp (TyVarTy tv) ty_args
       paDFunApply dfun ty_args
 paDictOfTyApp (TyConApp tc _) ty_args
   = do
-      dfun <- maybeV (lookupTyConPA tc)
+      dfun <- traceMaybeV "paDictOfTyApp" (ppr tc) (lookupTyConPA tc)
       paDFunApply (Var dfun) ty_args
 paDictOfTyApp ty ty_args = pprPanic "paDictOfTyApp" (ppr ty)