.raku

      proto method declare(@, @, :$tag = Nil, |) { ... }

      multi method declare([], [$name], :$tag = Nil) {
         say " → leaf $name";
         %.children{$name} //= Node[ClassTag].new(
            :parent(self),
            :tag($tag // ClassTag.new),
            :$name
         )
      }

      # This ^
      # Appears to shadow this v
      
      multi method declare([], [$name, *@class], :$tag = Nil) {
         given %.children{$name} //= Node[ClassTag].new: :parent(self), :$name {
            say " → declare({@class.gist}) [ClassTag]";
            .declare(@class, :$tag);
         }
      }

      # Also, @class here doesn't match array params unless it's marked as greedy (*)
      multi method declare([$name, *@package], *@class, :$tag = Nil) {
         given %.children{$name} //= Node[PackageTag].new: :parent(self), :$name {
            say " → declare({@package.gist}, {@class.gist})";
            .declare(@package, |@class, :$tag);
         }
      }