Roman
Roman
I've added simple layers grouping. It is handy in many situations when there is many similar layers.
Language tour have many example of classes and their initialization, but none of them includes named arguments that also initialize. Would be nice have something like: ```dart class Point {...
Consider following code: ```dart abstract class A {} abstract class B implements A { b(); } void foo(A a) { if (a is B) { return a.b(); } } ```...