call site 18 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 168
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   def test_channel_syntax_error(self):
       # missing colon
->     channel = self.gw.remote_exec('def foo()\n return 1\nfoo()\n')
       try:
           channel.receive()
       except channel.RemoteError, e:
           assert str(e).startswith('Traceback (most recent call last):')
           assert str(e).find('SyntaxError') > -1