Transient ranges

[Steven Schveighoffer via Digitalmars-d]

On 5/27/16 7:42 PM, Seb wrote:

> So what about the convention to explicitely declare a `.transient` enum
> member on a range, if the front element value can change?

enum isTransient(R) = is(typeof(() {
    static assert(isInputRange!R);
    static assert(hasIndirections(ElementType!R));
    static assert(!allIndrectionsImmutable!(ElementType!R)); // need to 
write this
}));

-Steve