Why do you expect this to print a warning? If the open call in mycheck fails, you return an anonymous subroutine. Test::Simple checks if this equals 0 (which it does not), so the test fails. At no point is the subroutine you return actually called, hence no warning.

In reply to Re: Getting stderr from a test::simple by AppleFritter
in thread Getting stderr from a test::simple by neilwatson

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