Hard to figure out from an error message where incompatible method declarations meet

Description

When we launch a PHP application, we might get a similar message:

Fatal error: Declaration of Baz::getId(): mixed must be compatible with Foo::getId(): int in /tmp/preview on line 13

When we look up the declarations of these methods, we get this:

interface Foo
{
    
    public function getId(): int;
    
}

abstract class Baz
{
    
    public function getId(): mixed
    {
        //...
    }
    
}

They have nothing in common, their existence on their own shouldn't be a problem for our application.

The problem is when they meet via a common child that both extends Baz and implements Foo:

class Lorem extends Baz implements Foo
{
    
}

The problem is that we don't learn about Lorem from the PHP error message which makes it really hard to find Loremin a large application.

Personally I solved it by enabling Xdebug in develop mode and looking at the stack trace. One (or both) of these two things would help to debug this problem in the future:

1. Show fatal error stack trace in PHP out of the box, without requiring Xdebug.
2. Somehow include Lorem too in this error message: Fatal error: Declaration of Baz::getId(): mixed must be compatible with Foo::getId(): int in /tmp/preview on line 13

3v4l.org link: https://3v4l.org/4iOYG