Fix #255 InvalidOperationException: The new node 'CheckedExpression' is not valid in the role Initializer

ICSharpCode.Decompiler/Ast/Transforms/AddCheckedBlocks.cs

@@ -339,7 +339,7 @@ namespace ICSharpCode.Decompiler.Ast.Transforms
 							result.NodesToInsertInCheckedContext = result.NodesToInsertInUncheckedContext + new ConvertCompoundAssignment(expr, false);
 						}
 					}
-				} else {
+				} else if (expr.Role.IsValid(Expression.Null)) {
 					// We use '<' so that expressions are introduced on the deepest level possible (goal 3)
 					if (result.CostInCheckedContext + new Cost(0, 1) < result.CostInUncheckedContext) {
 						result.CostInUncheckedContext = result.CostInCheckedContext + new Cost(0, 1);

ICSharpCode.Decompiler/Tests/CheckedUnchecked.cs

@@ -109,4 +109,9 @@ public class CheckedUnchecked
 	{
 		return f(t);
 	}
+	
+	public void CheckedInArrayCreationArgument(int a, int b)
+	{
+		Console.WriteLine(new int[checked(a + b)]);
+	}
 }