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#!/usr/bin/env perl6

sub num( $x, $y, ?$z ) {
    $x.say;
    $y.say;
    $z.say if $z;
}

num( 5, 7, 9 );

Quote

Unable to parse multisig; couldn't find final ')' at line 4, near ", ?$z ) {\n"
in Main (src/gen_setting.pm:0)