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using System;
class X
{
static int counter;
static int Index ()
{
if (counter++ != 0)
throw new ApplicationException ();
return 1;
}
int? indexer;
int? this [int index] {
get {
return indexer;
}
set {
indexer = value;
}
}
static int Test ()
{
int? a = 5;
int? b = a++;
if (a != 6)
return 1;
if (b != 5)
return 2;
int? c = ++a;
if (c != 7)
return 3;
b++;
++b;
if (b != 7)
return 4;
int? d = b++ + ++a;
if (a != 8)
return 5;
if (b != 8)
return 6;
if (d != 15)
return 7;
var s = new short?[] { 3, 2, 1 };
counter = 0;
var r = s [Index ()]++;
if (counter != 1)
return 8;
if (r != 2)
return 9;
if (s[1] != 3)
return 10;
counter = 0;
s [Index ()]++;
if (counter != 1)
return 11;
if (s[1] != 4)
return 12;
X x = new X ();
x.indexer = 6;
counter = 0;
var r2 = x[Index ()]--;
if (counter != 1)
return 13;
if (r2 != 6)
return 14;
if (x.indexer != 5)
return 15;
return 0;
}
public static int Main ()
{
int result = Test ();
if (result != 0)
Console.WriteLine ("ERROR: {0}", result);
return result;
}
}
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