caller(1) is attempting to get information about the subroutine that called simple_compare (in particular, to see if it is Array::Compare::perm). Since you are calling it from your main program, there is no such subroutine, and caller(1) returns an empty list.

When you call caller from the debugger command line, the debugger's own stack of calls gets in the way and produces different results.

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In reply to Re: Bug in Array::Compare? (no, really) by ysth
in thread Bug in Array::Compare? (no, really) by planetscape

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