"Cannot access field or identifier timeout for writing" with call before assignment

[Gama11]

The following used to compile with Haxe 4.0.0-rc.2, but no longer does on dev (probably related to #8011):

class Main {
	static function main() {}

	static function foo(state:Dynamic) {
		var instance = state.instance;
		instance.timeout.stop();
		instance.timeout = null; // Cannot access field or identifier timeout for writing
	}
}

The above code is isolated from Lime 7.2.1. Is this an intentional breaking change, or a regression?

[Simn]

¬_(&!")£&!"$(£&)"(*$"£($"£$£"}~~}£"?$

[nadako]

what if you type-hint var instance with Dynamic?

[Simn]

Yes that works, it's an instance of the dynamic inference issue.