Fix Trac #3012: allow more free-wheeling in standalone deriving

[ghc-hetmet.git] / compiler / hsSyn / HsExpr.lhs

diff --git a/compiler/hsSyn/HsExpr.lhs b/compiler/hsSyn/HsExpr.lhs
index 3142abc..0800175 100644 (file)
--- a/compiler/hsSyn/HsExpr.lhs
+++ b/compiler/hsSyn/HsExpr.lhs
@@ -392,7 +392,7 @@ ppr_expr (ExplicitTuple exprs boxity)
   where
     ppr_tup_args []               = []
     ppr_tup_args (Present e : es) = (ppr_lexpr e <> punc es) : ppr_tup_args es
-    ppr_tup_args (Missing _ : es) = comma : ppr_tup_args es
+    ppr_tup_args (Missing _ : es) = punc es : ppr_tup_args es
 
     punc (Present {} : _) = comma <> space
     punc (Missing {} : _) = comma