36nullableWarnings.Add(GetId(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate)); 453case ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate: 1963or ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate

9291ReportDiagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, arg.location, 9362ReportDiagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, location,

213case ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate:

33024Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "() =>").WithArguments("lambda expression", "System.Func<string?>").WithLocation(10, 12)

46448Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull2.M").WithArguments("object? extension<object?>(object?).M()", "System.Func<object>").WithLocation(8, 26), 46451Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull2.M2").WithArguments("object? E.M2<object?>(object? t)", "System.Func<object>").WithLocation(9, 26), 46454Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull3.M").WithArguments("object? extension<object?>(object?).M()", "System.Func<object>").WithLocation(12, 29), 46457Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull3.M2").WithArguments("object? E.M2<object?>(object? t)", "System.Func<object>").WithLocation(13, 29)); 46523Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull.M").WithArguments("object? extension<object?>(object?).M(object? t2)", "System.Func<object, object>").WithLocation(4, 33), 46526Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "oNull.M2").WithArguments("object? E.M2<object?>(object? t, object? t2)", "System.Func<object, object>").WithLocation(5, 34)); 46640Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Derived1.M").WithArguments("object? extension<object?>(C<object?>).M()", "System.Func<object>").WithLocation(3, 25)); 46688Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Derived1.M").WithArguments("object? extension<object?>(C<object?>).M()", "System.Func<object>").WithLocation(3, 9), 46694Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "new Derived1().M2").WithArguments("object? E.M2<object?>(C<object?> t)", "System.Func<object>").WithLocation(6, 9));

9809Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "object? (object x3) =>").WithArguments("lambda expression", "System.Func<object, object>").WithLocation(12, 21), 9818Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "object? (object y3) =>").WithArguments("lambda expression", "System.Func<object, object>").WithLocation(16, 21),

4236Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "System.Func<object>").WithLocation(8, 27), 4239Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] () =>").WithArguments("lambda expression", "System.Func<object?>").WithLocation(9, 28), 4283Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "System.Func<object>").WithLocation(13, 27), 4286Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "D1").WithLocation(14, 17), 4289Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "D3").WithLocation(16, 17), 4298Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] () =>").WithArguments("lambda expression", "D2").WithLocation(20, 17), 4307Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] () =>").WithArguments("lambda expression", "System.Func<object?>").WithLocation(23, 28), 4316Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] object? () =>").WithArguments("lambda expression", "D2").WithLocation(25, 18), 4404Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "System.Func<object>").WithLocation(13, 30), 4407Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "D1").WithLocation(14, 20), 4410Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] () =>").WithArguments("lambda expression", "D3").WithLocation(16, 20), 4419Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] () =>").WithArguments("lambda expression", "D2").WithLocation(20, 20), 4428Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] () =>").WithArguments("lambda expression", "System.Func<object?>").WithLocation(23, 31), 4437Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] object? () =>").WithArguments("lambda expression", "D2").WithLocation(25, 20), 4640Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, @"[return: NotNullIfNotNull(""o"")] (object? o) =>").WithArguments("lambda expression", "D3").WithLocation(17, 17), 5160Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string () =>").WithArguments("lambda expression", "System.Func<string?>").WithLocation(9, 28)); 5184Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string? () =>").WithArguments("lambda expression", "System.Func<string>").WithLocation(10, 39)); 5244Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string () =>").WithArguments("lambda expression", "System.Func<string?>").WithLocation(9, 28), 5247Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string? () =>").WithArguments("lambda expression", "System.Func<string>").WithLocation(10, 27), 5250Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "S<object> () =>").WithArguments("lambda expression", "System.Func<S<object?>>").WithLocation(13, 31), 5253Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "S<object?> () =>").WithArguments("lambda expression", "System.Func<S<object>>").WithLocation(14, 30)); 5282Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "ref S<object> () =>").WithArguments("lambda expression", "D1<S<object?>>").WithLocation(10, 30), 5285Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "ref S<object?> () =>").WithArguments("lambda expression", "D1<S<object>>").WithLocation(11, 29), 5288Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "ref readonly S<object> () =>").WithArguments("lambda expression", "D2<S<object?>>").WithLocation(14, 30), 5291Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "ref readonly S<object?> () =>").WithArguments("lambda expression", "D2<S<object>>").WithLocation(15, 29)); 5505Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string () =>").WithArguments("lambda expression", "System.Func<string?>").WithLocation(7, 28), 5511Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "string? () =>").WithArguments("lambda expression", "System.Func<string>").WithLocation(8, 27));

1956Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M2").WithArguments("string? C.M2(string? s)", "C.Copier").WithLocation(6, 20) 2471Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1").WithArguments("string? C.M1(string? x)", "System.Func<string, string>").WithLocation(13, 45), 4437Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "(D)M1").WithArguments("string? C.M1(string s)", "C.D").WithLocation(6, 17), 11029Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "NullableReturnMethod").WithArguments("string[]? C.NullableReturnMethod(string[] x)", "MyDelegate").WithLocation(18, 25), 39803Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: MaybeNull] string () =>").WithArguments("lambda expression", "System.Func<string>").WithLocation(28, 10), 39806Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "[return: NotNull] string?() =>").WithArguments("lambda expression", "System.Func<string?>").WithLocation(33, 10), 69227Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1").WithArguments("CL0<string?> C.M1(CL0<string> x)", "C.D1").WithLocation(14, 24), 69233Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M3").WithArguments("CL0<string> C.M3(CL0<string?> x)", "C.D2").WithLocation(24, 24), 69348Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<T?>").WithArguments("T? Program.F<T?>()", "D<T>").WithLocation(7, 22)); 69485Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<object?>").WithArguments("object? C.F<object?>()", "D<object>").WithLocation(10, 27), 69488Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<I<object?>>").WithArguments("I<object?> C.F<I<object?>>()", "D<I<object>>").WithLocation(12, 30), 69491Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<I<object>>").WithArguments("I<object> C.F<I<object>>()", "D<I<object?>>").WithLocation(13, 31), 69494Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<IIn<object>>").WithArguments("IIn<object> C.F<IIn<object>>()", "D<IIn<object?>>").WithLocation(15, 33), 69497Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<IOut<object?>>").WithArguments("IOut<object?> C.F<IOut<object?>>()", "D<IOut<object>>").WithLocation(16, 33)); 70098Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "c.M1").WithArguments("string C.M1()", "System.Func<string>").WithLocation(19, 30), 70192Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "c.M4").WithArguments("string? C.M4()", "D2").WithLocation(20, 20) 70253Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "c.M1").WithArguments("string C.M1()", "System.Func<object>").WithLocation(27, 30), 70259Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "c.M5").WithArguments("string Program.M5(C c)", "System.Func<object>").WithLocation(37, 30), 70324Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "e.FirstOrDefault").WithArguments("string D.FirstOrDefault(string[] e)", "System.Func<string>").WithLocation(13, 26) 70365Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M2").WithArguments("ref readonly string? C.M2()", "D<string>").WithLocation(10, 24), 70368Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "d2").WithArguments("ref readonly string? D<string?>.Invoke()", "D<string>").WithLocation(15, 27), 70408Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M2").WithArguments("ref readonly string? C.M2()", "D1").WithLocation(11, 17), 70411Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "d2").WithArguments("ref readonly string? D2.Invoke()", "D1").WithLocation(16, 20) 70465Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method").WithArguments("string? Helper.Method(string? arg)", "System.Func<string?, string>").WithLocation(24, 16) 70618Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1<string?>").WithArguments("string? Helper.Method1<string?>(string? t)", "System.Func<string?, string>").WithLocation(15, 16), 70621Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1<T?>").WithArguments("T? Helper.Method1<T?>(T? t)", "System.Func<T, T>").WithLocation(23, 16), 70624Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1<T?>").WithArguments("T? Helper.Method1<T?>(T? t)", "System.Func<T?, T>").WithLocation(31, 16) 70726Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1(string? x, string? y)", "System.Func<string?, string?, string>").WithLocation(23, 16) 70778Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1<T>(T t)", "System.Func<T, string>").WithLocation(7, 16), 70781Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1<T>(T t)", "System.Func<T, string>").WithLocation(19, 16), 70784Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1<T?>(T? t)", "System.Func<T?, string>").WithLocation(28, 16)); 70825Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1<T>(T t)", "D1<T>").WithLocation(6, 16), 70828Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Helper.Method1").WithArguments("string? Helper.Method1<T?>(T? t)", "D2<T>").WithLocation(10, 16)); 70909Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<object?>").WithArguments("object? C.F<object?>()", "D<object>").WithLocation(10, 23), 70912Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<I<object?>>").WithArguments("I<object?> C.F<I<object?>>()", "D<I<object>>").WithLocation(12, 26), 70915Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<I<object>>").WithArguments("I<object> C.F<I<object>>()", "D<I<object?>>").WithLocation(13, 27), 70918Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<IIn<object>>").WithArguments("IIn<object> C.F<IIn<object>>()", "D<IIn<object?>>").WithLocation(15, 29), 70921Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F<IOut<object?>>").WithArguments("IOut<object?> C.F<IOut<object?>>()", "D<IOut<object>>").WithLocation(16, 29)); 70996Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.M").WithArguments("object? A<object?>.M()", "D<object>").WithLocation(13, 23)); 73101Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1<string?>").WithArguments("string? C.M1<string?>()", "System.Func<string>").WithLocation(17, 34), 73104Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1<CL0<string>>").WithArguments("CL0<string> C.M1<CL0<string>>()", "System.Func<CL0<string?>>").WithLocation(22, 40), 73107Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1<CL0<string?>>").WithArguments("CL0<string?> C.M1<CL0<string?>>()", "System.Func<CL0<string>>").WithLocation(27, 39) 73140Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "(System.Func<string>)M1<string?>").WithArguments("string? C.M1<string?>()", "System.Func<string>").WithLocation(13, 34), 73143Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "(System.Func<CL0<string?>>)M1<CL0<string>>").WithArguments("CL0<string> C.M1<CL0<string>>()", "System.Func<CL0<string?>>").WithLocation(14, 40), 73146Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "(System.Func<CL0<string>>)M1<CL0<string?>>").WithArguments("CL0<string?> C.M1<CL0<string?>>()", "System.Func<CL0<string>>").WithLocation(15, 39) 78193Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F2").WithArguments("string? C.F2()", "D<object>").WithLocation(12, 19), 78196Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "F4").WithArguments("object? C.F4()", "D<object>").WithLocation(14, 19)); 140957Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "t.F").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(12, 13), 140960Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "t.F<T?>").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(14, 13), 140963Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "t.F").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(16, 22), 140966Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "t.F<T?>").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(18, 22)); 141034Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(y).F").WithArguments("object? C<object?>.F()", "D<object>").WithLocation(18, 14), 141037Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(y).F").WithArguments("object? C<object?>.F()", "D<object>").WithLocation(22, 27)); 141239Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(s).F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(15, 13), 141242Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(16, 13), 141245Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(17, 13), 141248Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(s).F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(18, 27), 141251Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(19, 27), 141254Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("string? C<string?>.F()", "D<string>").WithLocation(20, 27)); 141292Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("object? E.F<object?>(object? t)", "D<object>").WithLocation(17, 14), 141295Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("object? E.F<object?>(object? t)", "D<object>").WithLocation(21, 27)); 141490Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(s).F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(18, 13), 141493Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(19, 13), 141496Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(20, 13), 141499Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "Create(s).F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(21, 27), 141502Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(22, 27), 141505Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "y.F").WithArguments("string? E.F<string?>(C<string?> c)", "D<string>").WithLocation(23, 27)); 141575Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(14, 22), 141578Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "x.F").WithArguments("T? E.F<T?>(T? t)", "D<T>").WithLocation(15, 26)); 141606Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "default(string).F").WithArguments("string? E.F<string?>(string? t)", "D<string>").WithLocation(10, 4)); 159057Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "f1").WithArguments("object f1()", "System.Func<object>").WithLocation(9, 27), 160638Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M1").WithArguments("CL0<string?> C.M1(CL0<string> x)", "C.D1").WithLocation(14, 24), 160644Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "M3").WithArguments("CL0<string> C.M3(CL0<string?> x)", "C.D2").WithLocation(24, 24), 160706Diagnostic(ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate, "d2").WithArguments("ref readonly string? D<string?>.Invoke()", "D<string>").WithLocation(9, 28)

366case ErrorCode.WRN_NullabilityMismatchInReturnTypeOfTargetDelegate: