Fix initialization of FakeProperty with setter

Seems like a typo - the setter method was assigned to the Getter property

The test GuessAccessors needed adjustments in the generated code.
ILSpy is more eager to merge property assignments

ICSharpCode.Decompiler.Tests/TestCases/ILPretty/GuessAccessors.cs

@@ -15,9 +15,8 @@ namespace ClassLibrary1
 			//IL_0007: Expected O, but got Unknown
 			UnknownClass val = new UnknownClass();
 			int? unknownProperty = val.UnknownProperty;
-			int? num = unknownProperty.GetValueOrDefault();
-			val.UnknownProperty = num;
-			int? num2 = num;
+			int? num2 = (val.UnknownProperty = unknownProperty.GetValueOrDefault());
+			int? num3 = num2;
 			List<object> list = new List<object> {
 			val[unknownProperty.Value] ?? "",
 			val.NotProperty,
@@ -51,10 +50,9 @@ namespace ClassLibrary1
 			//IL_00e1: Expected O, but got Unknown
 			//IL_00e1: Expected O, but got Unknown
 			UnknownGenericClass<UnknownEventArgs> val = new UnknownGenericClass<UnknownEventArgs>();
-			UnknownEventArgs unknownProperty = val.UnknownProperty;
-			val.UnknownProperty = unknownProperty;
+			UnknownEventArgs val2 = (val.UnknownProperty = val.UnknownProperty);
 			List<object> list = new List<object> {
-				val[((object)unknownProperty).GetHashCode()] ?? "",
+				val[((object)val2).GetHashCode()] ?? "",
 				val.NotProperty,
 				val.get_NotPropertyWithGeneric<string>(42),
 				val[42],
@@ -63,18 +61,17 @@ namespace ClassLibrary1
 			};
 			val.OnEvent += Instance_OnEvent;
 			val.OnEvent -= Instance_OnEvent;
-			UnknownEventArgs val2 = val[(UnknownEventArgs)null];
-			val[new UnknownEventArgs()] = val2;
-			UnknownEventArgs val3 = val[new UnknownEventArgs(), new UnknownEventArgs()];
-			val[new UnknownEventArgs(), new UnknownEventArgs()] = val3;
+			UnknownEventArgs val3 = val[(UnknownEventArgs)null];
+			val[new UnknownEventArgs()] = val3;
+			UnknownEventArgs val4 = val[new UnknownEventArgs(), new UnknownEventArgs()];
+			val[new UnknownEventArgs(), new UnknownEventArgs()] = val4;
 		}
 
 		public void MethodUnknownStatic()
 		{
-			int? unknownProperty = UnknownStaticClass.UnknownProperty;
-			UnknownStaticClass.UnknownProperty = unknownProperty;
+			int? num = (UnknownStaticClass.UnknownProperty = UnknownStaticClass.UnknownProperty);
 			List<object> list = new List<object> {
-				UnknownStaticClass[unknownProperty.Value] ?? "",
+				UnknownStaticClass[num.Value] ?? "",
 				UnknownStaticClass.NotProperty,
 				UnknownStaticClass.get_NotPropertyWithGeneric<string>(42),
 				UnknownStaticClass[42],
@@ -87,10 +84,9 @@ namespace ClassLibrary1
 
 		public void MethodUnknownStaticGeneric()
 		{
-			string unknownProperty = UnknownStaticGenericClass<string>.UnknownProperty;
-			UnknownStaticGenericClass<string>.UnknownProperty = unknownProperty;
+			string text = (UnknownStaticGenericClass<string>.UnknownProperty = UnknownStaticGenericClass<string>.UnknownProperty);
 			List<object> list = new List<object> {
-				UnknownStaticGenericClass<string>[unknownProperty.Length] ?? "",
+				UnknownStaticGenericClass<string>[text.Length] ?? "",
 				UnknownStaticGenericClass<string>.NotProperty,
 				UnknownStaticGenericClass<string>.get_NotPropertyWithGeneric<string>(42),
 				UnknownStaticGenericClass<string>[42],
@@ -121,4 +117,4 @@ namespace ClassLibrary1
 			throw new NotImplementedException();
 		}
 	}
-}
+}

ICSharpCode.Decompiler/TypeSystem/MetadataModule.cs

@@ -670,7 +670,7 @@ namespace ICSharpCode.Decompiler.TypeSystem
 
 					m.AccessorKind = MethodSemanticsAttributes.Setter;
 					m.AccessorOwner = fakeProperty;
-					fakeProperty.Getter = m;
+					fakeProperty.Setter = m;
 					fakeProperty.ReturnType = parameters.Last().Type;
 					fakeProperty.IsIndexer = parameters.Count > 1;
 					fakeProperty.Parameters = parameters.SkipLast(1).ToArray();