wren/test/language/class/foreign_class_inherit_fields.wren

class Foo {
  method() {
    _field = "value"
  }
}

foreign class Bar is Foo {} // expect runtime error: Foreign class 'Bar' may not inherit from a class with fields.
First pass at implementing foreign classes. Most of the pieces are there: - You can declare a foreign class. - It will call your C function to provide an allocator function. - Whenever a foreign object is created, it calls the allocator. - Foreign methods can access the foreign bytes of an object. - Most of the runtime checking is in place for things like subclassing foreign classes. There is still some loose ends to tie up: - Finalizers are not called. - Some of the error-handling could be better. - The GC doesn't track how much memory a marked foreign object uses. 2015-08-15 12:07:53 -07:00			`class Foo {`
			`method() {`
			`_field = "value"`
			`}`
			`}`

			`foreign class Bar is Foo {} // expect runtime error: Foreign class 'Bar' may not inherit from a class with fields.`