4.2. Recursion Limit
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When first using the procedurally-recursive version, warnings were given for
deep recursion.
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Deep recursion on subroutine "main::sum" at recurse.pl line 17.
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To resolve it one can specify no warnings "recursion".
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However, the perl debugger still warns about "100 levels deep in subroutine calls!".
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To resolve this set the $DB::deep to a large enough value from
within the perl debugger.
Written by Shlomi Fish