Bug 8308 - Wrong handling of multidimensional array initializer
Summary: Wrong handling of multidimensional array initializer
Alias: None
Product: Compilers
Classification: Mono
Component: C# ()
Version: unspecified
Hardware: PC Linux
: --- normal
Target Milestone: ---
Assignee: Marek Safar
Depends on:
Reported: 2012-11-09 06:37 UTC by Alex Willmy
Modified: 2012-11-09 10:24 UTC (History)
1 user (show)

Is this bug a regression?: ---
Last known good build:

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Description Alex Willmy 2012-11-09 06:37:58 UTC
Mono Version:
OS: Ubuntu 12.04

The following instantiation of a multidimensional array should throw a compiler error because the number of elements in each nested initializer must be the same. But on my machine this code compiles without errors.  

public static void Main (string[] args)
    int[,] a = new int[,] { {0, 1}, {2, 3, 4}, {5, 6} };

    Console.WriteLine (a[1, 0]);  // 2
    Console.WriteLine (a[1, 1]);  // 3
    // Console.WriteLine (a[1, 2]);  // IndexOutOfRangeException

    Console.WriteLine (a[2, 0]);  // 4
    Console.WriteLine (a[2, 1]);  // 5

From the C# spec:

For a multi-dimensional array, the array initializer must have as many levels of nesting as there are dimensions in the array. The outermost nesting level corresponds to the leftmost dimension and the innermost nesting level corresponds to the rightmost dimension. The length of each dimension of the array is determined by the number of elements at the corresponding nesting level in the array initializer. For each nested array initializer, the number of elements must be the same as the other array initializers at the same level.

Comment 1 Marek Safar 2012-11-09 10:24:45 UTC
Already fixed in Mono 3.0