message: Add tuple targets to the context handling mechanism in templates.
diff: @@ -68,6 +68,10 @@ class ReplaceTransformer(gast.NodeTransformer):
  if isinstance(node, gast.Attribute):
  self._set_inner_child_context(node.value, ctx)
  node.ctx = gast.Load()
  + elif isinstance(node, gast.Tuple):
  + for e in node.elts:
  + self._set_inner_child_context(e, ctx)
  + node.ctx = ctx
  elif isinstance(node, gast.Name):
  node.ctx = ctx
  elif isinstance(node, (gast.Str, gast.Num)):
  