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-rw-r--r--ghc/compiler/deSugar/Match.lhs2
1 files changed, 1 insertions, 1 deletions
diff --git a/ghc/compiler/deSugar/Match.lhs b/ghc/compiler/deSugar/Match.lhs
index 4380041333..fd4bb5dfce 100644
--- a/ghc/compiler/deSugar/Match.lhs
+++ b/ghc/compiler/deSugar/Match.lhs
@@ -334,7 +334,7 @@ tidy1 v (RecPat con_id pat_ty rpats) match_result
pats = map mk_pat tagged_arg_tys
-- Boring stuff to find the arg-tys of the constructor
- (_, inst_tys, _) = getAppDataTyCon pat_ty
+ (_, inst_tys, _) = _trace "getAppDataTyCon.Match" $ getAppDataTyCon pat_ty
con_arg_tys' = dataConArgTys con_id inst_tys
tagged_arg_tys = con_arg_tys' `zip` allFieldLabelTags