Please tell me this is a bug?

[Almighty Bob via Digitalmars-d]

On Sunday, 22 February 2015 at 09:59:36 UTC, ponce wrote:
> On Sunday, 22 February 2015 at 02:27:30 UTC, Peter Alexander 
> wrote:
>> On Sunday, 22 February 2015 at 01:24:09 UTC, Almighty Bob 
>> wrote:

>>> are semantically equivalent to:
>>> 
>>> a = cast(typeof(a))(a op b)
>>
>> Seems questionable to me. Anyone know the rationale? If a = b; 
>> is disallowed, I don't see why a += b; should be more 
>> acceptable.
>
> Questionable or not, this is the C behaviour we might not 
> depart from.

D has already departed from C,

int a;
float b;
a = b;
a = a+b;
a += b;

All 3 are valid in C, but only the later is valid in D.

But at least with MSVC you can get warnings when you do such 
things.