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Bug #1946342: nesting composite columns sometimes fails with a list index exception.
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@ -1385,7 +1385,7 @@ class TemplateFormatter(string.Formatter):
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@property
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def gpm_interpreter(self):
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if len(self._interpreters) <= self.recursion_level:
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while len(self._interpreters) <= self.recursion_level:
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self._interpreters.append(_Interpreter())
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return self._interpreters[self.recursion_level]
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