Update: Ignore this post. I read "and a" instead of "from a".

It is added when the while/until condition is a scalar assignment

As far as I can tell, that's not true. The following prints nothing: 

perl -le"while ($a=0) { print 'ysth is right'; last }"

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Tested with Perl 5.6.0, 5.6.1, 5.8.0, 5.8.8, 5.10.0.

In reply to Re^3: <STDIN> not initializing $_ by ikegami
in thread <STDIN> not initializing $_ by carol

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