'Visit a Call node.'

@utils.check_messages('set-trace')
def visit_call(self, node):

    if hasattr(node, 'func'):
        infer = utils.safe_infer(node.func)
        if infer:
            if (getattr(node.func, 'name', None) == 'set_trace'):
                self.add_message('set-trace', node=node)
