[Issue 10960] New: Copying a const value type should yield unqual

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10960

           Summary: Copying a const value type should yield unqual
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: hsteoh at quickfur.ath.cx


--- Comment #0 from hsteoh at quickfur.ath.cx 2013-09-03 16:09:25 PDT ---
This is from a forum post.

Code:
------
void main(){
    auto A = [0, 1, 2];
    const B = [10, -20, 30];
    schwartzSort!(i => B[i])(A); // NG
}
------
This fails because the return type of the lambda is deduced as const(int). This
is silly since a copied const value type no longer needs to be const; it should
be unqual.

Explicitly naming the unqual type for the delegate fixes the problem:

    schwartzSort!(delegate int (i) => B[i])(A); // OK

The user shouldn't be required to do this; returning a const value type by
value should be stripped of its constness, since it is not the original value
being returned, but a copy.

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