merged in Vitek's fix for ticket 668

Cython/Compiler/ParseTreeTransforms.py

@@ -299,6 +299,20 @@ class PostParse(ScopeTrackingTransform):
 
         return assign_node
 
+    def _flatten_sequence(self, seq, result):
+        for arg in seq.args:
+            if arg.is_sequence_constructor:
+                self._flatten_sequence(arg, result)
+            else:
+                result.append(arg)
+        return result
+
+    def visit_DelStatNode(self, node):
+        self.visitchildren(node)
+        node.args = self._flatten_sequence(node, [])
+        return node
+
+
 def eliminate_rhs_duplicates(expr_list_list, ref_node_sequence):
     """Replace rhs items by LetRefNodes if they appear more than once.
     Creates a sequence of LetRefNodes that set up the required temps

tests/run/delete.pyx

@@ -87,3 +87,12 @@ def del_local(a):
     """
     del a
     assert a is None # Until we have unbound locals...
+
+def del_seq(a, b, c):
+    """
+    >>> del_seq(1, 2, 3)
+    """
+    del a, (b, c)
+    assert a is None # Until we have unbound locals...
+    assert b is None # Until we have unbound locals...
+    assert c is None # Until we have unbound locals...