Compiler bug? (alias sth this; and std.signals)

[Joe]

No one? Is this a bug, or am I overlooking something? (entirely 
possible since I didn't use D since trying it once in D1 times)

On Monday, 12 November 2012 at 11:59:50 UTC, Joe wrote:
> Ok, i was trying out D and wanted to see if i could create 
> something that behaves like a property but adds a change 
> notification signal. Doing this, I encountered a hangup which 
> might be a bug. So far I have the following:
>
> -----------------------------------------------------------
>
> import std.signals;
> import std.stdio;
>
> struct Property
> {
> 	alias get this;
> 	
> 	int set(int v) { emit(); return data_ = v; }
> 	int get() { return data_; }
> 	
> 	int opAssign(int v) { return set(v); }
> 	
> 	mixin Signal!();
>
> private:
> 	int data_ = 0;
> }
>
> struct Foo
> {
> 	Property prop;
> }
>
> class Observer
> {
> 	void watch()
> 	{
> 		writeln("Value change observed!");
> 	}
> }
>
> -----------------------------------------------------------
>
> This works:
> void main()
> {
> 	Foo f;
> 	Observer o = new Observer;
> 	f.prop.connect(&o.watch);
> 	f.prop = 7;
> }
>
> This also works:
> void main()
> {
> 	Foo f;
> 	Observer o = new Observer;
> 	f.prop = 7;
> 	writeln(f.prop);
> }
>
> This never terminates:
> void main()
> {
> 	Foo f;
> 	Observer o = new Observer;
> 	f.prop.connect(&o.watch);
> 	f.prop = 7;
> 	writeln(f.prop);
> }