It used to be quite easy to get eval to fail but not have $@ set at the end (simply use eval inside a destructor). Doing some testing, it appears that several of the ways this used to happen have been fixed.

I'll continue to make the last expression in my evals to be a true value so I can test for failure directly:

eval "...; 1"
    or  die "Eval failed: $@\n";
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                - tye