If you use it just in the messages coming from die or warn, it's confusing, but not critical. Basing the program flow on the value would be a critical problem, though:
... die $! if $!; # Can stop your program for no real reason.
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Re^4: Should I worry about "Inappropriate ioctl for device"?
by Lady_Aleena (Curate) on Aug 07, 2020 at 23:18 UTC