Hey there, here's a question for the class. Why don't you get bareword warnings under "use strict" while you're in a BEGIN {} block. Here's some code:

#!/usr/bin/perl


use strict;
#use warnings;
#require strict;

sub BEGIN {
        #while(calldepth < 5)
        {
        }

        #$strict_error_here =1;
};

sub foo {
        #while(calldepth < 5)
        {

        }
}

#while(calldepth < 5)
{

}
[download]

Some notes about the following code:

• Uncommenting the while() inside of BEGIN throws no warning. Doing so with use warnings in effect gives a non-numeric warning, but still allows the code to loop forever.
• Uncommenting the while in the subroutine foo() and by itself, both produce the warning under strict;
• Placing a use strict; doesn't do anything inside of BEGIN
• Uncommenting $strict_error_here actually causes a parse error
• Switching the calldepth to something like calldepth++, also produces the error.

So I guess my question is, why doesn't a bareword throw an error inside of a BEGIN function (under strict)?

My second question is, is there any reason at all for perl to not warn you when comparing against a constant in a while() or unless() function, as in the functions above.

Any insight into perl's murkiness here would be great

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