usage of ref foreach with variadic functions fails with "cannot be ref"

[error via Digitalmars-d-learn]

On Sunday, 12 February 2017 at 03:34:19 UTC, Michael Coulombe 
wrote:

> Do you have a complete code example that gives your error? I 
> can't reproduce it (DMD v2.073.0):
>
> int foo(T...)(T vars) {
>     int i = 0;
>     foreach(ref v ; vars) {
>         v = 5;
>         i += v;
>     }
>     return i;
> }
> void bar(T...)(ref T vars) {
>     foreach(ref v ; vars) {
>         v = 3;
>     }
> }
> void main() {
>     import std.stdio;
>     int x = 7;
>     bar(x);
>     writeln(foo(4,x,8.2)); // 15, no errors
> }

Oh... That's really strange;  I've updated my code to use non 
indexed foreach, and it's now building without the error...  I 
have absolutely no idea what caused the error to occur.  I've 
also tried reverting to earlier versions of the project, and I 
can't recreate the issue.  If it occurs again, I'll snapshot the 
project and try to make a repeatable set up.