Non-local goto (setjmp/longmap) implementation based on libunwind
The unwind-setjmp library offers a libunwind-based implementation of
non-local gotos. This is a drop-in replacement for the normal,
system-provided routines of the same name. With this library, setting
up a non-local goto via setjmp is generally faster compared to the
system routines, at the cost of a much slower longjmp.
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