# Minimum number of arguments that must be specified
sub get_min_require_params {
   my ($sub) = @_;
   my $required_params = 0;
   my $prototype = prototype($sub);
   return 0 if !defined($prototype);
   for ($prototype) {
      if (/
         \G
         (?: \$
         |   \*
         |   \\(?: \[ [^\]] \] | [^\[] )
         |   \&
         )
      /xsgc) {
         ++$required_params;
         next;
      }

      if (/
         \G
         (?: \_   # Can only be followed by ";"
         |   \@
         |   \%
         |   \;
         |   \z
      /xsgc) {
         last;
      }

      die("Unrecognized prototype\n");
   }
}