Please tell me this is a bug?

[ketmar via Digitalmars-d]

On Sun, 22 Feb 2015 09:59:35 +0000, 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:
>>> a += b; // Compiles with no ERROR!
>>>
>>> Please tell me that's a bug?
>>
>> Not a bug. From spec:
>>
>> http://dlang.org/expression.html#AssignExpression
>>> Assignment operator expressions, such as:
>>> 
>>> a op= b
>>> 
>>> 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.

but compiler can at least warn about implicit converting float to int. 
one can always silence warning with `cast(int)f`. ER, anybody?
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