that is bug?

[Ali]

On Saturday, 7 April 2018 at 18:52:56 UTC, Ali Çehreli wrote:
> On 04/07/2018 10:53 AM, Ali wrote:
> > On Saturday, 7 April 2018 at 15:26:56 UTC, Ali Çehreli wrote:
> >> On 04/07/2018 02:07 AM, sdvcn wrote:
> >>>      string stt = "none";
> >>>      true?writeln("AA"):writeln("BB");   ///Out:AA
> >>>          true?stt="AA":stt="BB";    <<<<-----///Out:BB
> >>>      writeln(stt);
> >>
> >> It is a bug because the behavior does not match the spec:
> >>
> >>   https://issues.dlang.org/show_bug.cgi?id=18743
> >>
> >> Ali
> >
> > Hi Ali C
> >
> > I think it also a bug because the ternary seem to be
> returning the
> > second part
>
> Maybe... but the following is not a good test for that because 
> the return value of the assignment operator would always be stt 
> regardless of which expression is evaluated.
>
> >
> > try
> >
> >      string stt = "none";
> >      string b = "";
> >      true?writeln("AA"):writeln("BB");   ///Out:AA
> >      b = (true ? stt="AA":stt="BB");    ///Out:BB
> >      writeln(stt);
> >      writeln(b); ///Out:BB
>
> I tried something else and noticed that it doesn't actually 
> evaluate the third expression because b is never changed:
>
> import std.stdio;
>
> void main() {
>     int a;
>     int b;
>     int * c = &(true ? a = 1 : b = 2);
>     writefln("a:%s %s", a, &a);
>     writefln("b:%s %s", b, &b);
>     writefln("c:  %s", c);
> }
>
> Output:
>
> a:2 7FFDBBF57DB0  <-- Got the value of the third expression 
> (BAD)
> b:0 7FFDBBF57DB4  <-- Not changed (good)
> c:  7FFDBBF57DB0  <-- Address of a (good)
>
> So, the expression correctly decides to affect and returns 'a' 
> but uses the wrong value to assign.
>
> Ali

this kinda explains what happens to me
try
     string stt = "none";
     string b = "";
     true?writeln("AA"):writeln("BB");
     b = (true ? stt="AA": stt )="BB";
     writeln(stt);
     writeln(b);

output
AA
BB
BB

now try

     string stt = "none";
     string b = "";
     true?writeln("AA"):writeln("BB");   ///Out:AA
     (b = (true ? stt="AA": stt ))="BB";    ///Out:BB
     writeln(stt);
     writeln(b);

output
AA
AA
BB

so it seems
that since
     b = (true ? stt="AA": stt )="BB";
and
     b = true ? stt="AA": stt ="BB";

are equivalent
that

that the ternary operator return stt (after assigning it "AA") 
then assign "BB" to it