Integrate perlio:
Jarkko Hietaniemi [Sat, 27 Apr 2002 17:53:20 +0000 (17:53 +0000)]
[ 16221]
Correct which var is nulled, stack movement protection.
p4raw-link: @16221 on //depot/perlio: 9b683d952a173213146cd75796b01b79b8cc4a79

p4raw-id: //depot/perl@16224


Trivial merge