testing croak without the use of any secondary test module

I realized the other day that since all I was using from Test::Fatal was its exception function, I could successfully replace it with the following, with no changes to my tests necessary. However, this still theoretically suffers from the same problems I linked to earlier.

sub exception (&) {
    return eval { shift->(); 1 } ? undef
        : ($@ || confess "\$@ was false");
}
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