Description:
------------
Starting from PHP 7.0, the self type-hint in an anonymous function within a trait refers back to the first class that created/used the anonymous function. The bug occurs in PHP 7.0, 7.1 and 7.2. This was no problem in PHP 5.6 (https://3v4l.org/oKeSG).

In the example below, classes Foo and Bar do not share anything except for the trait. The anonymous function is created within the local scope of a non-static method, so should not be shared among different objects implementing this trait.

Test script:
---------------
<?php
trait Feature {
    public function getClass() {
        $func = function (self $instance) {
            print get_class($instance);
        };
        $func($this);
    }
}

class Foo {
    use Feature;
}

class Bar {
    use Feature;
}

(new Foo)->getClass();
(new Bar)->getClass();

Expected result:
----------------
FooBar

Actual result:
--------------
Foo
Fatal error: Uncaught TypeError: Argument 1 passed to Bar::{closure}() must be an instance of Foo, instance of Bar given, called in /in/EafpA on line 24 and defined in /in/EafpA:17
Stack trace:
#0 /in/EafpA(24): Bar->{closure}(Object(Bar))
#1 /in/EafpA(54): Bar->execute()
#2 {main}
  thrown in /in/EafpA on line 17