test.pl

sub foo() { say "in sub"; }

role Test {
    method postcircumfix:<( )>($args) {
        say "overridden";
    }
}

role Other {
    method bar() { say "foo"; }
}

&foo does Test;
&foo does Other;
foo();

# Prints "in sub", not "overridden" as expected.

class Foo { method foo() { say "in class"; } }
role TestFoo { method foo() { say "overridden"; } }

my Foo $x .= new;
$x does TestFoo;
$x does Other;
$x.foo;

# Prints "overridden" as expected.