Evaluation order of index expressions

[kinke via Digitalmars-d]

On Monday, 25 May 2015 at 17:21:05 UTC, Johannes Pfau wrote:
> import std.stdio;
> void main()
> {
>     int a = 0;
>     int bar()
>     {
>         a++;
>         return a;
>     }
>     a += bar(); // => a = a + bar()
>     writeln(a);
> }
>
> DMD: 2
> GDC: 1
>
> which one is correct?

So what about my previous example?

int b = 0;
((++b *= 5) *= 2) += ++b * (b -= 6);

DMD 2.067.1: 60, latest LDC: 65, GDC: ?

This divergence probably doesn't have anything to do with the 
evaluation order, which seems to be identical (LTR), but rather 
how the lhs expression is treated (a double-nature as nested 
lvalue to be assigned to and rvalue result of a binAssign 
expression). For more context, see 
https://github.com/ldc-developers/ldc/pull/873.