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Using "make update-copyrights" after setting GNULIB_PATH in my
config.mak
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Since we'll be forking for Xapian indexing and maybe
other places, having a simple guard in place to ensure
OnDestroy doesn't unexpectedly unlink files or similar
is a safer option.
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This is a localized version of the process-wide END{}, but runs
at the end of variable scope. A subroutine ref and arguments
may be passed, which allows us to avoid anonymous subs and
problems they cause.
It's similar to `defer' or `ensure' in other languages; Perl can
rely on deterministic destructors due to refcounting.
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