I would point out that sub import is called during syntax checks as well, not that this is a problem in your example, but something to watch out for. (Often, people forget this detail...)

In pmtest.pm:

package pmtest;

sub import {
    print "sub import called\n";
}
1;
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In pmtest.pl:

use pmtest;
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Result:

>perl -c pmtest.pl
sub import called
pmtest.pl syntax OK
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