Evaluation order of index expressions

[deadalnix via Digitalmars-d]

On Monday, 25 May 2015 at 17:25:57 UTC, Andrei Alexandrescu wrote:
>> It's not += doing the magic, it's bar(). And it's not limited 
>> to
>> concurrency, it happens with every side effect:
>>
>> 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?
>
> GDC. -- Andrei

You made me change SDC to return 2 recently using the following 
as an argument (one lwoering per line):

a += foo();
((ref X, Y) => X = X + Y)(a, foo());

http://33.media.tumblr.com/31bb0136f46468417bd3ccac1c52c769/tumblr_inline_nix5v8WXLd1t7oi6g.gif