Curious, but is perldiag a program or part of the built-in help? Cuz when I type perldiag at the linux prompt it does nothing.
Neither. Perl does not come with built-in help. Instead, perl comes with a gazillion manual pages - each of them listed in the perl manual page.

You have typed man perl from your Linux prompt at least once, didn't you?

In reply to Re^3: Strictly nested sub warnings by JavaFan
in thread Strictly nested sub warnings by raybies

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