Can't get into the details right now, the code I've worked on isn't here. One issue is that $SIG{__DIE__} won't work correctly with eval {} and eval "", even when testing $^S.
perlvar sais:
Due to an implementation glitch, the $SIG{__DIE__} hook is called even inside an eval(). Do not use this to rewrite a
pending exception in $@, or as a bizarre substitute for overriding CORE::GLOBAL::die(). This strange action at a dis‐
tance may be fixed in a future release so that $SIG{__DIE__} is only called if your program is about to exit, as was the
original intent. Any other use is deprecated.
The only thing overriding CORE::GLOBAL::die won't catch is compile-time parser errors, but then you won't need a stack trace.
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