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@puremagic.com
        ReportedBy: acehreli@yahoo.com


--- Comment #0 from Ali Cehreli <acehreli@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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http://d.puremagic.com/issues/show_bug.cgi?id=10562


Maxim Fomin <maxim@maxim-fomin.ru> changed:

           What    |Removed                     |Added
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                 CC|                            |maxim@maxim-fomin.ru


--- Comment #1 from Maxim Fomin <maxim@maxim-fomin.ru> 2013-07-07 00:10:45 PDT ---
From the spec: "If a slice operator appears as the lvalue of an assignment expression, and the type of the rvalue is the same as the element type of the lvalue, then the lvalue's array contents are set to the rvalue. "

Assuming that single value initialization is a semantic equivalent of slice expression, the code should work.

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