<?php
/**
 * @created      09.01.2018
 * @author       Smiley <smiley@chillerlan.net>
 * @copyright    2018 Smiley
 * @license      MIT
 */

namespace Example;

interface A {
	public function log(string $message):A;
	public function doStuff():A;
}

interface B {
	public function log(string $message):B;
	public function doOtherStuff():B;
}

trait Log{

	public function log(string $message){
		echo $message.PHP_EOL;

		return $this;
	}

}

class ClassA implements A{

	use Log{
		log as _log;
	}

	public function log(string $message):A{
		return $this->_log($message);
	}

	public function doStuff():A{
		return $this;
	}

}

// proposal
class ClassB implements B{

	use Log{
		log as log:B; // a new return type
	}

	public function doOtherStuff():B{
		return $this;
	}

}