Can you invoke it directly in the test script as &{$SIG{__DIE__}} and test accordingly from there?
Only if the !$^S branch doesn't die (and doesn't call something that does). I should have made that clearer in my original post. Will fix. Thanks.
# potential workaround
use constant DEFAULT_FILENAME => 'foo.txt';
my $filename = prompt_for_filename() || DEFAULT_FILENAME;
I don't see how the second alternative of the || could ever be false (i.e. the coverage would never be 100%).
Update: Ah, I see.
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