[GSoC] Precise GC

[thedeemon via Digitalmars-d-announce]

On Tuesday, 6 September 2016 at 14:56:15 UTC, jmh530 wrote:

>> GC (and runtime in general) has no idea what code is safe and 
>> what code is system. GC works with data at run-time. All 
>> @safe-related stuff is about code (not data!) and happens at 
>> compile-time. They are completely orthogonal and independent, 
>> as I understand.
>
> I don't see why you wouldn't be able to use compile-time 
> information like __traits with the runtime.
>
> In my head, I imagine that at compile-time you can figure out 
> which unions are in @safe functions, add a UDA to each (so 
> you're marking data, not code), and then read that information 
> at run-time (like with __traits).

UDAs are also purely compile-time, they don't exist as run-time 
data.