use_ok is called at run time. The script has already been parsed at the moment, without any knowledge of the prototypes. See Far More than Everything You've Ever Wanted to Know about Prototypes in Perl -- by Tom Christiansen.
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In reply to Re: Prototypes being ignored with use_ok() from Test:More ? by choroba
in thread Prototypes being ignored with use_ok() from Test:More ? by JPMH

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