Signal-slot concept in an imaginary Upd programming language

signals.upd

package stuff

import {
	"fmt"

	"github.com/tucnak/pipes" // пасхалка
}

class A {
slots:
	Do() {
		emit Done()
	}

signals:
	Done()
}

class B {
slots:
	Log() {
		fmt.Println("Hello, world!")
	}
}

fn main() {
	a := A{}
	b := B{}

	connect(a.Done, b.Log)

	a.Do() // "Hello world!"
}