[Issue 12007] cartesianProduct does'nt work with ranges of immutables

[d-bugmail at puremagic.com]

https://d.puremagic.com/issues/show_bug.cgi?id=12007


monarchdodra at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |monarchdodra at gmail.com
            Summary|cartesianProduct does'nt    |cartesianProduct does'nt
                   |work with immutable ranges  |work with ranges of
                   |                            |immutables


--- Comment #3 from monarchdodra at gmail.com 2014-01-28 03:39:53 PST ---
Changing name: The problem isn't "immutable ranges" (which technically aren't
even ranges btw), but having ranges of immutable.

The problem mainly lies in a combination `Repeat`, the `isForwardRange` trait,
and `Zip`

The problem is that while `Repeat!(immutable(int))` *is* saveable, the type is
not *assignable*. This could be partially fixed inside Repeat for objects that
are "CompatibleUnqual".

It also sparks the questions of:
Should saveable ranges necessarily be assignable?

Now, with that said, zip makes an assignment in its save, when I'm pretty sure
it could simply do construction (but this is a more of a generic issue
actually).

In any case, *both* should be solvable pretty easily.

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