[Issue 10562] New: Cannot initialize arrays by an element value when the elements are fixed-length arrays

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=10562

           Summary: Cannot initialize arrays by an element value when the
                    elements are fixed-length arrays
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: acehreli at yahoo.com


--- Comment #0 from Ali Cehreli <acehreli at yahoo.com> 2013-07-06 22:05:22 PDT ---
We know that arrays can be initialized by a single element value:

void main()
{
    int value = 1;
    int[2] a = value;
    assert(a == [ 1, 1 ]);
}

The bug is that it does not work when the elements are fixed-length arrays
themselves:

void main()
{
    int[3] value = [ 1, 2, 3 ];
    int[3][2] a = value;  // <-- COMPILATION ERROR
    assert(a == [ [ 1, 2, 3 ], [ 1, 2, 3 ] ]);
}

Error: mismatched array lengths, 6 and 3

On the other hand, the array can be initialized by an element-of-an-element:

void main()
{
    // Note: This is the type of an element of array elements
    int value = 1;
    int[3][2] a = value;
    assert(a == [ [ 1, 1, 1 ], [ 1, 1, 1 ] ]);
}

Is that a feature or perhaps a consequence of the reported bug?

Ali

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