Fixed return duplication in the case when the last return statement was already removed.

ICSharpCode.Decompiler/ILAst/GotoRemoval.cs

@@ -64,7 +64,7 @@ namespace ICSharpCode.Decompiler.ILAst
 					
 					int count = ilCase.Body.Count;
 					if (count >= 2) {
-						if (!ilCase.Body[count - 2].CanFallthough() &&
+						if (!ilCase.Body[count - 2].CanFallThough() &&
 						    ilCase.Body[count - 1].Match(ILCode.LoopOrSwitchBreak)) {
 							ilCase.Body.RemoveAt(count - 1);
 						}

ICSharpCode.Decompiler/ILAst/ILAstOptimizer.cs

@@ -350,9 +350,8 @@ namespace ICSharpCode.Decompiler.ILAst
 						// Inline return statement
 						ILNode target;
 						List<ILExpression> retArgs;
-						if (nextSibling.TryGetValue(targetLabel, out target) &&
-						    target.Match(ILCode.Ret, out retArgs))
-						{
+						if (nextSibling.TryGetValue(targetLabel, out target)) {
+							if (target.Match(ILCode.Ret, out retArgs)) {
 								ILVariable locVar;
 								object constValue;
 								if (retArgs.Count == 0) {
@@ -363,6 +362,12 @@ namespace ICSharpCode.Decompiler.ILAst
 									block.Body[i] = new ILExpression(ILCode.Ret, null, new ILExpression(ILCode.Ldc_I4, constValue));
 								}
 							}
+						} else {
+							if (method.Body.Count > 0 && method.Body.Last() == targetLabel) {
+								// It exits the main method - so it is same as return;
+								block.Body[i] = new ILExpression(ILCode.Ret, null);
+							}
+						}
 					}
 				}
 			}
@@ -796,8 +801,8 @@ namespace ICSharpCode.Decompiler.ILAst
 				for (int i = 0; i < block.Body.Count; i++) {
 					ILCondition cond = block.Body[i] as ILCondition;
 					if (cond != null) {
-						bool trueExits = cond.TrueBlock.Body.Count > 0 && !cond.TrueBlock.Body.Last().CanFallthough();
-						bool falseExits = cond.FalseBlock.Body.Count > 0 && !cond.FalseBlock.Body.Last().CanFallthough();
+						bool trueExits = cond.TrueBlock.Body.Count > 0 && !cond.TrueBlock.Body.Last().CanFallThough();
+						bool falseExits = cond.FalseBlock.Body.Count > 0 && !cond.FalseBlock.Body.Last().CanFallThough();
 						
 						if (trueExits) {
 							// Move the false block after the condition
@@ -899,19 +904,11 @@ namespace ICSharpCode.Decompiler.ILAst
 			return false;
 		}
 		
-		public static bool CanFallthough(this ILNode node)
+		public static bool CanFallThough(this ILNode node)
 		{
 			ILExpression expr = node as ILExpression;
 			if (expr != null) {
-				switch(expr.Code) {
-					case ILCode.Br:
-					case ILCode.Ret:
-					case ILCode.Throw:
-					case ILCode.Rethrow:
-					case ILCode.LoopContinue:
-					case ILCode.LoopOrSwitchBreak:
-						return false;
-				}
+				return expr.Code.CanFallThough();
 			}
 			return true;
 		}

ICSharpCode.Decompiler/ILAst/ILCodes.cs

@@ -286,6 +286,8 @@ namespace ICSharpCode.Decompiler.ILAst
 				case ILCode.Endfinally:
 				case ILCode.Throw:
 				case ILCode.Rethrow:
+				case ILCode.LoopContinue:
+				case ILCode.LoopOrSwitchBreak:
 					return false;
 				default:
 					return true;