https://issues.dlang.org/show_bug.cgi?id=9149
--- Comment #13 from timon.g...@gmx.ch --- (In reply to Steven Schveighoffer from comment #12) > Yes I see. > > The issue is the conversion of the delegate type, when the context pointer > is changed to const (but you didn't change the function pointer, so it still > assumes it's argument is mutable). > > I agree with you. > > So basically, any struct or class instance cannot convert to const (or via > pure constructor to immutable) Do you have an example where conversion to immutable for a strongly pure constructor leads to problems? > if it contains a non-const delegate. Yuck, > but I think we have to do that. We can't (for class references, you never know whether some subclass might have a mutable delegate field). We need to do something else, but all options I have proposed so far are quite ugly (or become ugly when considering all the details required to make them work), so I'm open to different proposals. --
