Compiler Error CS0247

Cannot use a negative size with stackalloc

A negative number was passed to a stackalloc statement.

The following sample generates CS0247:

// CS0247.cs  
// compile with: /unsafe  
public class MyClass  
{  
   unsafe public static void Main()  
   {  
      int *p = stackalloc int[-30];   // CS0247  
   }  
}