Cleanup factory from Template::Grammar #202
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Resolves #147
This is providing a unit test to check memory leak
from the provided sample from RT 49456
Test::LeakTrace do detect a leak from the provided sample,
but this is not really a leak, this is just coming from the
fact that Template::Grammar is not reseting its singleton factory
object.
This commit adds a 'convoluted' technique to clear the singleton
on DESTROY when it makes sense.
Upstream-URL: #147