false positive on private trait method

[jacekkarczmarczyk]

Bug report

phpstan: 0.12.33, bleeding edge

If a private trait method is not used in some class phpstan raises a warning that the method is not used even if it's used in other class

Code snippet that reproduces the problem

https://phpstan.org/r/72f07c19-65b2-4ab6-a12b-d42cd37cd60f

<?php declare(strict_types = 1);

trait Foo {
	private function bar(): void {} // Method Namaste::bar() is unused.
	private function baz(): void {} // Method HelloWorld::bar() is unused.
}

class HelloWorld
{
	use Foo;
	
	public function hello(): void {
		$this->bar();
	}
}

class Namaste
{
	use Foo;
	
	public function hello(): void {
		$this->baz();
	}
}

Expected output

no error

[enumag]

Yeah, it doesn't really make sense to report unused trait methods and properties in the context of each class they're used. However it would make sense to report them without class context if they aren't used in ANY class that uses the trait.

[ondrejmirtes]

However it would make sense to report them without class context if they aren't used in ANY class that uses the trait.

This is hard as it has to work with parallelized processing.

[ondrejmirtes]

Fixed: phpstan/phpstan-src@5958c29

[github-actions]

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