Respond to an unknown method call

class Farragut {
    method FALLBACK ($name, *@rest) {
        say "{self.WHAT.raku}: $name.tc() the @rest[], full speed ahead!";
    }
}

class Sparrow is Farragut { }

Farragut.damn: 'torpedoes';
Sparrow.hoist: <Jolly Roger mateys>;

Output:

Farragut: Damn the torpedoes, full speed ahead!
Sparrow: Hoist the Jolly Roger mateys, full speed ahead!

<a rel="nofollow" class="external text" href="https://docs.raku.org/language/typesystem#index-entry-FALLBACK_(method)">FALLBACK</a> will be called for any method that is not defined. Since any class inherits from Any, there will be plenty of already defined methods. Those which are not defined can also be used as L-Values by the magic of <a rel="nofollow" class="external text" href="https://docs.raku.org/type/Attribute#index-entry-trait_is_rw_(Attribute)-trait_is_rw">is rw</a>.

class L-Value { 
    our $.value = 10;
    method FALLBACK($name, |c) is rw { $.value }
}

my $l = L-Value.new;
say $l.any-odd-name; # 10
$l.some-other-name = 42;
say $l.i-dont-know; # 42