You shouldn't use &func; (or &$func_rec;) unless you intend to. It doesn't pass "no parameters", it passes the @_ unlocalised, unchanged.

&$func_rec()             # No params
&$func_rec(param, ...)   # With params

$func_rec->()            # Same as above,
$func_rec->(param, ...)  #    but easier to read
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