static foreach over constant range in @nogc block

[Timon Gehr]

On 03.10.20 13:18, tspike wrote:
> I came across an issue recently that I’m a little confused by. The 
> following program fails to compile under LDC and DMD, though it compiles 
> fine under GDC:
> 
>      @nogc:
> 
>      void main()
>      {
>          static foreach(i; 0 .. 4)
>          {
>              pragma(msg, i);
>          }
>      }
> 
> Both DMD and LDC report the following error if I try to compile it:
> 
>      test.d(7): Error: cannot use operator ~= in @nogc delegate 
> test.main.__lambda1
> 
> I was just wondering, is this is a compiler bug or is there a reason I'm 
> overlooking preventing this sort of code from compiling?

It's a compiler bug, the same as this one:

@nogc:
void main(){
     static immutable x = { int[] a; a~=1; return a; }();
}