Problem with using struct ranges with @disabled this(this) with some range functions

[Uranuz via Digitalmars-d-learn]

As far as I understand to save current cursor of forward range I 
should always use *save* property. But sometimes range struct is 
just copied using postblit without using save (it happens even in 
Phobos). Is it correct behaviour to *pass ownership* for range 
structs via just copying of range or not. As I think for at least 
*forward* ranges that are structs we must always use save methot 
to store new cursor. But for *input* ranges it is not possible, 
so there maybe plain copying could be allowed. I thing that we 
should work out some descision on this problem, provide some 
unittests for different types of ranges with and without postblit 
for standard Phobos functions and fix them accordingly.

I have problem with std.range.take function and forward range 
with disabled postblit and I don't understand is it my or library 
bug?