Is the following code legal?

[Andrei Alexandrescu via Digitalmars-d]

On 11/02/2016 10:21 AM, Shachar Shemesh wrote:
> int[int] hash;
>
> ..
>
> foreach( key, ref value; hash ) {
>     if( value>12 )
>         hash.remove(key);
> }
>
> Some hash implementations support this, some don't. The D documentation
> (https://dlang.org/spec/hash-map.html) leaves this not defined.
>
> As reference, C++ does define this (in C++ it is allowed, at least since
> C++14: http://en.cppreference.com/w/cpp/container/unordered_map/erase)
>
> Shachar

We should render it defined, and document it as such. Could you please 
create an issue and I'll have someone look at it. Thanks! -- Andrei