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Carp: distinguish deleted stash from top of stack
The change to work with deleted stashes broke the behavior of Carp
at the top of the stack.
This change distinguishes between the two cases: at the top of the
stack, caller(1) returns (). If the stash has been deleted, it
returns a populated list with an undefined package name. The test
used here is to check for a defined line number, which should be
sufficient.
https://perl5.git.perl.org / perl5.git / commit