Is the following code legal?

[Shachar Shemesh via Digitalmars-d]

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