Yes, the implicit BEGIN{} around use is killing you. But it's easy enough to kill it first: 

my $pid;
BEGIN { $pid = $$ }
use Module $pid;  # ta da

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As a separate matter, you should beware about a numeric first argument to use because Perl may interpret it as a minimum required version for the given module.

    -- Chip Salzenberg, Free-Floating Agent of Chaos

In reply to Re: passing a $var thru a "use module($var)" by chip
in thread passing a $var thru a "use module($var)" by zentara

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