message: Clean up dead core.
diff: @@ -113,10 +113,6 @@ class Analyzer(cfg.GraphVisitor):
  def __init__(self, graph, definition_factory):
  self._definition_factory = definition_factory
  super(Analyzer, self).__init__(graph)
  - # This allows communicating that nodes have extra reaching definitions,
  - # e.g. those that a function closes over.
  - self.extra_in = {}
  -
  self.gen_map = {}
  def init_state(self, _):
  @@ -125,7 +121,7 @@ class Analyzer(cfg.GraphVisitor):
  def visit_node(self, node):
  prev_defs_out = self.out[node]
  - defs_in = _NodeState(self.extra_in.get(node.ast_node, None))
  + defs_in = _NodeState()
  for n in node.prev:
  defs_in |= self.out[n]
  