Should debug{} allow GC?

[Gary Willoughby via Digitalmars-d]

On Sunday, 11 September 2016 at 07:46:09 UTC, Manu wrote:
> I'm having a lot of trouble debugging @nogc functions. I have a 
> number of debug functions that use GC, but I can't call them 
> from @nogc code... should debug{} allow @nogc calls, the same 
> as impure calls?

We could with something like this in Phobos:

void assumeNogc(alias Func, T...)(T xs) @nogc {
	import std.traits;
	static auto assumeNogcPtr(T)(T f) if (
		isFunctionPointer!T || isDelegate!T
	) {
   	    enum attrs = functionAttributes!T | FunctionAttribute.nogc;
     	    return cast(SetFunctionAttributes!(T, functionLinkage!T, 
attrs)) f;
	};
	assumeNogcPtr(&Func!T)(xs);
};


void main() @nogc
{
	import std.stdio;
	assumeNogc!writefln("foo %s", 42);
}

Source: https://dpaste.dzfl.pl/8c5ec90c5b39