Alias chains are not understood

[weirdan]

https://psalm.dev/r/db0e8cc040 is valid: https://3v4l.org/1OFJK

[psalm-github-bot]

I found these snippets:

https://psalm.dev/r/db0e8cc040

<?php
interface I {}
class_alias(I::class, I1::class);
class_alias(I1::class, I2::class);

class C implements I2 {}

function f(I1 $_): void {}

f(new C);

Psalm output (using commit fdd286f):

ERROR: UndefinedClass - 4:24 - Class, interface or enum named I2 does not exist

INFO: MixedArgument - 4:24 - Argument 2 of class_alias cannot be mixed, expecting string

ERROR: MissingDependency - 10:7 - C depends on class or interface i1 that does not exist

INFO: MixedArgument - 10:3 - Argument 1 of f cannot be mixed, expecting I1

ERROR: UndefinedClass - 6:20 - Class, interface or enum named I2 does not exist

[boesing]

I've added a fix for this issue in #6335