Description:
------------
A public abstract method declaration on a trait is fulfilled by a private method on a 'use'-ing class. This seems like an incorrect behaviour.

You can see on https://3v4l.org/a65oD that the problem exists even in git-master

It is inconsistent with abstract classes or interfaces.

Test script:
---------------
<?php

trait ATrait {
	abstract public function foo( string $url ) : int;
}

class AClass {
	use ATrait;

	private function foo( string $url ) : int {
		return 10;
	} 
}

Expected result:
----------------
Behave either like interfaces:

"Fatal error: Access type for interface method ATrait::foo() must be omitted in - on line 4"
Similar to interfaces

OR like an abstract class:

"Fatal error: Access level to ATrait::foo() must be public (as in class ParentClass) in - on line 8"


Actual result:
--------------
No error