Why this code:

#! /usr/bin/perl -w

use strict;
use IO::Prompt;

while (my $x = prompt "x: ", -while => '') {}
[download]

give me this warning?

Use of uninitialized value in pattern match (m//) at /usr/local/share/
+perl/5.8.8/IO/Prompt.pm line 91.
[download]

Thanks.

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