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avoid vivifying UNIVERSAL::isa:: in Carp
authorZefram <zefram@fysh.org>
Thu, 15 Feb 2018 18:21:14 +0000 (18:21 +0000)
committerZefram <zefram@fysh.org>
Thu, 15 Feb 2018 18:21:14 +0000 (18:21 +0000)
The test added to Carp by commit 915a6810d3e3198d759f025f85d1fd6f3171dd27
for UNIVERSAL::isa being loaded had the side effect of vivifying the
UNIVERSAL::isa stash.  Take more care about checking for UNIVERSAL::isa
to avoid vivifying it, as for the other checks for things in optional
modules.  Fixes [perl #132788].


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