Methods returning Collections cannot be used in for-each loops

[echebbi]

Expected behavior

We can call a method that returns a Collection to initiate the range of a for-each loop:

open class HelloWorld {	

    @main
    override void greeting() {
        for (name in self.names()) {
            name.log();
        }
    }
	
    def Sequence(String) names() {
        result := Sequence{'Lorem', 'Ipsum'};
    }	

}

Current behavior

The editor shows an error Expected Collection but was [ecore::EEList].

The interpreter behaves as expected so this only affects the type checker.