private void EmitLoopBeginning()
{
loopStartLabel = il.DefineLabel();
loopConditionLabel = il.DefineLabel();
iVar = il.DeclareLocal(typeof(int)); // int i
il.Ldc_I4(0); // i = 0
il.Stloc(iVar);
il.Br(loopConditionLabel); // goto loopConditionLabel
il.MarkLabel(loopStartLabel); // label loopStartLabel
}