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See https://bugs.launchpad.net/zope.pagetemplate/+bug/732972
This implements the short workaround version of the solution mentioned in the
bug: let's skip macro expansion checking while we're formatting an error
traceback (with the default recursion limit of 100 this still burns a lot of
CPU: ~20 seconds on a 2.5 GHz Core i5).
The test can be easily extended for the better suggested solution (some time in
the future): just drop check_macro_expansion=False and make sure METAL silently
stops recursing iff it notices a loop and TAL evaluation is disabled.
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