Fix bug when the replacement template is a callable object
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@ -90,7 +90,7 @@ def _expand(match, template):
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def _subn(pattern, template, string, count=0):
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# internal: pattern.subn implementation hook
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if callable(template):
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filter = callable
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filter = template
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else:
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# FIXME: prepare template
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def filter(match, template=template):
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