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ILSpy/ICSharpCode.Decompiler.Tests/TestCases/Pretty/LocalFunctions.cs
T
Siegfried Pammer f007528af9 Fix #3008: local function forwarding a display class loses its scope 
Roslyn passes a display class into a local function by ref, and a local
function that only forwards that parameter to a sibling has no closure
variable of its own. The closure analysis therefore found nothing to
anchor it and fell back to the root method body, which put it out of
reach of the callees it forwards to; CallBuilder then hit the assert
guarding a local function reference it cannot resolve and emitted the
raw metadata name of the target instead.

The constructor path also mixed use-site containers into a scope the
closure analysis had already determined; when the use-sites live in
separate function bodies there is no common container, and resetting to
the constructor body threw that scope away.

Assisted-by: Claude:claude-opus-5:Claude Code
2026-09-02 00:12:30 +02:00

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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
using System;
using System.Collections.Generic;
using System.Linq;
#if CS90
using System.Runtime.InteropServices;
#endif
using System.Threading.Tasks;
namespace LocalFunctions
{
internal class LocalFunctions
{
[AttributeUsage(AttributeTargets.All)]
internal class MyAttribute : Attribute
{
}
public class Generic<T1> where T1 : struct, ICloneable, IConvertible
{
public int MixedLocalFunction<T2>() where T2 : ICloneable, IConvertible
{
#pragma warning disable CS0219
T2 t2 = default;
object z = this;
for (int i = 0; i < 10; i++)
{
int i2 = 0;
i2 += NonStaticMethod<object>(0);
#if CS90
[My]
[return: My]
int NonStaticMethod<[My] T3>([My] int unused)
#else
int NonStaticMethod<T3>(int unused)
#endif
{
t2 = default;
int l = 0;
return NonStaticMethod3<T1>() + NonStaticMethod3<T2>() + z.GetHashCode();
int NonStaticMethod3<T4>()
{
return i2 + l + NonStaticMethod<T4>(0) + StaticMethod<decimal>();
}
}
}
return MixedLocalFunction<T1>() + MixedLocalFunction<T2>() + StaticMethod<decimal>() + StaticMethod<int>() + NonStaticMethod2() + StaticMethod4<object>(null) + StaticMethod5<T1>();
int NonStaticMethod2()
{
return GetHashCode();
}
#if CS80
static int StaticMethod<T3>() where T3 : struct
#else
int StaticMethod<T3>() where T3 : struct
#endif
{
return typeof(T1).Name.Length + typeof(T2).Name.Length + typeof(T3).Name.Length + StaticMethod<float>() + StaticMethod2<T3, DayOfWeek>() + StaticMethod3<T2, T3, DayOfWeek>();
}
#if CS80
static int StaticMethod2<T3, T4>() where T3 : struct where T4 : Enum
#else
int StaticMethod2<T3, T4>() where T3 : struct where T4 : Enum
#endif
{
return typeof(T1).Name.Length + typeof(T2).Name.Length + typeof(T3).Name.Length + typeof(T4).Name.Length + StaticMethod<float>() + StaticMethod2<T3, DayOfWeek>();
}
#pragma warning disable CS8387
#if CS80
static int StaticMethod3<T2, T3, T4>() where T2 : IConvertible where T3 : struct where T4 : Enum
#else
int StaticMethod3<T2, T3, T4>() where T2 : IConvertible where T3 : struct where T4 : Enum
#endif
#pragma warning restore CS8387
{
return typeof(T2).Name.Length;
}
#if CS80
static int StaticMethod4<T>(T dd)
#else
int StaticMethod4<T>(T dd)
#endif
{
return 0;
}
#if CS80
static int StaticMethod5<T3>()
#else
int StaticMethod5<T3>()
#endif
{
int k = 0;
return k + NonStaticMethod4<T1>();
int NonStaticMethod4<T4>()
{
return k;
}
}
#pragma warning restore CS0219
}
public int MixedLocalFunction2Delegate<T2>() where T2 : ICloneable, IConvertible
{
T2 t2 = default;
object z = this;
for (int i = 0; i < 10; i++)
{
int i2 = 0;
i2 += StaticInvokeAsFunc(NonStaticMethod<object>);
int NonStaticMethod<T3>()
{
t2 = default;
int l = 0;
return StaticInvokeAsFunc(NonStaticMethod3<T1>) + StaticInvokeAsFunc(NonStaticMethod3<T2>) + z.GetHashCode();
int NonStaticMethod3<T4>()
{
return i2 + l + StaticInvokeAsFunc(NonStaticMethod<T4>) + StaticInvokeAsFunc(StaticMethod<decimal>);
}
}
}
Console.WriteLine(t2);
return StaticInvokeAsFunc(MixedLocalFunction2Delegate<T1>) + StaticInvokeAsFunc(MixedLocalFunction2Delegate<T2>) + StaticInvokeAsFunc(StaticMethod<decimal>) + StaticInvokeAsFunc(StaticMethod<int>) + StaticInvokeAsFunc(NonStaticMethod2) + StaticInvokeAsFunc(StaticMethod4<T1>) + new Func<object, int>(StaticMethod5<object>)(null) + StaticInvokeAsFunc2<object>(StaticMethod5<object>) + new Func<Func<object, int>, int>(StaticInvokeAsFunc2<object>)(StaticMethod5<object>);
int NonStaticMethod2()
{
return GetHashCode();
}
#if CS80
static int StaticInvokeAsFunc(Func<int> func)
#else
int StaticInvokeAsFunc(Func<int> func)
#endif
{
return func();
}
#if CS80
static int StaticInvokeAsFunc2<T>(Func<T, int> func)
#else
int StaticInvokeAsFunc2<T>(Func<T, int> func)
#endif
{
return func(default);
}
#if CS80
static int StaticMethod<T3>() where T3 : struct
#else
int StaticMethod<T3>() where T3 : struct
#endif
{
return typeof(T1).Name.Length + typeof(T2).Name.Length + typeof(T3).Name.Length + StaticInvokeAsFunc(StaticMethod<float>) + StaticInvokeAsFunc(StaticMethod2<T3, DayOfWeek>) + StaticInvokeAsFunc(StaticMethod3<T2, T3, DayOfWeek>);
}
#if CS80
static int StaticMethod2<T3, T4>() where T3 : struct where T4 : Enum
#else
int StaticMethod2<T3, T4>() where T3 : struct where T4 : Enum
#endif
{
return typeof(T1).Name.Length + typeof(T2).Name.Length + typeof(T3).Name.Length + typeof(T4).Name.Length + StaticInvokeAsFunc(StaticMethod<float>) + StaticInvokeAsFunc(StaticMethod2<T3, DayOfWeek>);
}
#pragma warning disable CS8387
#if CS80
static int StaticMethod3<T2, T3, T4>() where T2 : IConvertible where T3 : struct where T4 : Enum
#else
int StaticMethod3<T2, T3, T4>() where T2 : IConvertible where T3 : struct where T4 : Enum
#endif
#pragma warning restore CS8387
{
return typeof(T2).Name.Length;
}
#if CS80
static int StaticMethod4<T3>()
#else
int StaticMethod4<T3>()
#endif
{
int k = 0;
return k + StaticInvokeAsFunc(NonStaticMethod4<T1>);
int NonStaticMethod4<T4>()
{
return k;
}
}
#if CS80
static int StaticMethod5<T>(T dd)
#else
int StaticMethod5<T>(T dd)
#endif
{
return 0;
}
}
public static void Test_CaptureT<T2>()
{
#pragma warning disable CS0219
T2 t2 = default;
Method<int>();
void Method<T3>()
{
t2 = default;
T2 t2x = t2;
T3 t3 = default;
Method2();
void Method2()
{
t2 = default;
t2x = t2;
t3 = default;
}
}
#pragma warning restore CS0219
}
public void TestGenericArgs<T2>() where T2 : List<T2>
{
ZZ<T2>(null);
ZZ3<object>(null);
#if CS80
static void Nop<T>(T data)
#else
void Nop<T>(T data)
#endif
{
}
#if CS80
static void ZZ<T3>(T3 t3) where T3 : T2
#else
void ZZ<T3>(T3 t3) where T3 : T2
#endif
{
Nop<List<T2>>(t3);
ZZ2<T3>(t3);
ZZ4();
void ZZ4()
{
Nop<List<T2>>(t3);
}
}
#if CS80
static void ZZ2<T3>(T3 t3)
#else
void ZZ2<T3>(T3 t3)
#endif
{
Nop<List<T2>>((List<T2>)(object)t3);
}
#if CS80
static void ZZ3<T3>(T3 t3)
#else
void ZZ3<T3>(T3 t3)
#endif
{
Nop<List<T2>>((List<T2>)(object)t3);
}
}
#if false
public void GenericArgsWithAnonymousType()
{
Method<int>();
#if CS80
static void Method<T2>()
#else
void Method<T2>()
#endif
{
int i = 0;
var obj2 = new {
A = 1
};
Method2(obj2);
Method3(obj2);
void Method2<T3>(T3 obj1)
{
//keep nested
i = 0;
}
#if CS80
static void Method3<T3>(T3 obj1)
#else
void Method3<T3>(T3 obj1)
#endif
{
}
}
}
#if CS80
public void NameConflict()
{
int i = 0;
Method<int>();
void Method<T2>()
{
Method();
void Method()
{
Method<T2>();
i = 0;
void Method<T2>()
{
i = 0;
Method();
static void Method()
{
}
}
}
}
}
#endif
#endif
}
private int field;
private Lazy<object> nonCapturinglocalFunctionInLambda = new Lazy<object>(() => {
return CreateValue();
#if CS80
static object CreateValue()
#else
object CreateValue()
#endif
{
return null;
}
});
private Lazy<object> capturinglocalFunctionInLambda = new Lazy<object>(() => {
int x = 42;
return Do();
object Do()
{
return CreateValue();
int CreateValue()
{
return x;
}
}
});
private static void Test(int x)
{
}
private static int GetInt(string a)
{
return a.Length;
}
private static string GetString(int a)
{
return a.ToString();
}
public static void StaticContextNoCapture(int length)
{
for (int i = 0; i < length; i++)
{
LocalWrite("Hello " + i);
}
#if CS80
static void LocalWrite(string s)
#else
void LocalWrite(string s)
#endif
{
Console.WriteLine(s);
}
}
public static void StaticContextSimpleCapture(int length)
{
for (int i = 0; i < length; i++)
{
LocalWrite();
}
void LocalWrite()
{
Console.WriteLine("Hello " + length);
}
}
public static void StaticContextCaptureForLoopVariable(int length)
{
int i;
for (i = 0; i < length; i++)
{
LocalWrite();
}
void LocalWrite()
{
Console.WriteLine("Hello " + i + "/" + length);
}
}
public void ContextNoCapture()
{
for (int i = 0; i < field; i++)
{
LocalWrite("Hello " + i);
}
#if CS80
static void LocalWrite(string s)
#else
void LocalWrite(string s)
#endif
{
Console.WriteLine(s);
}
}
public void ContextSimpleCapture()
{
for (int i = 0; i < field; i++)
{
LocalWrite();
}
void LocalWrite()
{
Console.WriteLine("Hello " + field);
}
}
public void ContextCaptureForLoopVariable()
{
int i;
for (i = 0; i < field; i++)
{
LocalWrite();
}
void LocalWrite()
{
Console.WriteLine("Hello " + i + "/" + field);
}
}
public void CapturedOutsideLoop()
{
int i = 0;
while (i < field)
{
i = GetInt("asdf");
LocalWrite();
}
void LocalWrite()
{
Console.WriteLine("Hello " + i + "/" + field);
}
}
public void CapturedInForeachLoop(IEnumerable<string> args)
{
foreach (string arg2 in args)
{
string arg = arg2;
LocalWrite();
void LocalWrite()
{
Console.WriteLine("Hello " + arg);
}
}
}
public void Overloading()
{
Test(5);
LocalFunctions.Test(2);
#if CS80
static void Test(int x)
#else
void Test(int x)
#endif
{
Console.WriteLine("x: {0}", x);
}
}
private void Name()
{
}
private void LocalFunctionHidingMethod()
{
Action action = this.Name;
Name();
action();
#if CS80
static void Name()
#else
void Name()
#endif
{
}
}
public void NamedArgument()
{
Use(Get(1), Get(2), Get(3));
Use(Get(1), c: Get(2), b: Get(3));
#if CS80
static int Get(int i)
#else
int Get(int i)
#endif
{
return i;
}
#if CS80
static void Use(int a, int b, int c)
#else
void Use(int a, int b, int c)
#endif
{
Console.WriteLine(a + b + c);
}
}
public static Func<int> LambdaInLocalFunction()
{
int x = (int)Math.Pow(2.0, 10.0);
return Create();
Func<int> Create()
{
return () => x;
}
}
public static Func<int> MethodRef()
{
int x = (int)Math.Pow(2.0, 10.0);
Enumerable.Range(1, 100).Select(LocalFunction);
return null;
int LocalFunction(int y)
{
return x * y;
}
}
public static int Fib(int i)
{
return FibHelper(i);
#if CS80
static int FibHelper(int n)
#else
int FibHelper(int n)
#endif
{
if (n <= 0)
{
return 0;
}
return FibHelper(n - 1) + FibHelper(n - 2);
}
}
public int MutuallyRecursiveLocalFunctions()
{
return B(4) + C(3);
#if CS80
static int A(int i)
#else
int A(int i)
#endif
{
if (i > 0)
{
return A(i - 1) + 2 * B(i - 1) + 3 * C(i - 1);
}
return 1;
}
#if CS80
static int B(int i)
#else
int B(int i)
#endif
{
if (i > 0)
{
return 3 * A(i - 1) + B(i - 1);
}
return 1;
}
#if CS80
static int C(int i)
#else
int C(int i)
#endif
{
if (i > 0)
{
return 2 * A(i - 1) + C(i - 1);
}
return 1;
}
}
public static int NestedLocalFunctions(int i)
{
return A();
int A()
{
double x = Math.Pow(10.0, 2.0);
return B();
int B()
{
return i + (int)x;
}
}
}
public static int LocalFunctionInLambda(IEnumerable<int> xs)
{
return xs.First((int x) => {
return Do();
bool Do()
{
return x == 3;
}
});
}
public static IEnumerable<int> YieldReturn(int n)
{
return GetNumbers();
IEnumerable<int> GetNumbers()
{
for (int i = 0; i < n; i++)
{
yield return i;
}
}
}
public static async Task<int> AsyncLocalFunction()
{
return await GetValueAsync() + await GetValueAsync();
#if CS80
static async Task<int> GetValueAsync()
#else
async Task<int> GetValueAsync()
#endif
{
await Task.Yield();
return 1;
}
}
public static async Task<int> AsyncLocalFunctionWithCapture(int n)
{
return await AddAsync();
async Task<int> AddAsync()
{
await Task.Yield();
return n + 1;
}
}
public void WriteCapturedParameter(int i)
{
ParamWrite();
Console.WriteLine(i);
void ParamWrite()
{
i++;
}
}
//public static void LocalFunctionInUsing()
//{
// using (MemoryStream memoryStream = new MemoryStream()) {
// Do();
// void Do()
// {
// memoryStream.WriteByte(42);
// }
// }
//}
public void NestedCapture1()
{
Method(null);
#if CS80
static Action<object> Method(Action<object> action)
#else
Action<object> Method(Action<object> action)
#endif
{
return Method2;
void Method2(object containerBuilder)
{
Method3(containerBuilder);
}
void Method3(object containerBuilder)
{
action(containerBuilder);
}
}
}
public int NestedCapture2()
{
return Method();
#if CS80
static int Method()
#else
int Method()
#endif
{
int t0 = 0;
return ZZZ();
int ZZZ()
{
t0 = 0;
int t2 = t0;
return new Func<int>(ZZZ3)();
int ZZZ3()
{
t0 = 0;
t2 = 0;
return ZZZ2();
}
}
int ZZZ2()
{
t0 = 0;
int t3 = t0;
return new Func<int>(ZZZ4)();
int ZZZ4()
{
t0 = 0;
t3 = 0;
return 0;
}
}
}
}
public int Issue1798_NestedCapture2()
{
return Method();
#if CS80
static int Method()
#else
int Method()
#endif
{
int t0 = 0;
return ZZZ();
int ZZZ()
{
t0 = 0;
int t2 = t0;
return ((Func<int>)(() => {
t0 = 0;
t2 = 0;
return ZZZ2();
}))();
}
int ZZZ2()
{
t0 = 0;
int t3 = t0;
#if !OPT
Func<int> func = () => {
#else
return ((Func<int>)(() => {
#endif
t0 = 0;
t3 = 0;
return 0;
#if !OPT
};
return func();
#else
}))();
#endif
}
}
}
public int Issue1798_NestedCapture2b()
{
return Method();
#if CS80
static int Method()
#else
int Method()
#endif
{
int t0 = 0;
return ZZZ() + ZZZ2();
int ZZZ()
{
t0 = 0;
int t2 = t0;
return ((Func<int>)(() => {
t0 = 0;
t2 = 0;
return ZZZ2();
}))();
}
int ZZZ2()
{
t0 = 0;
int t3 = t0;
#if !OPT
Func<int> func = () => {
#else
return ((Func<int>)(() => {
#endif
t0 = 0;
t3 = 0;
return 0;
#if !OPT
};
return func();
#else
}))();
#endif
}
}
}
#if CS90
public void Issue2196()
{
EnumWindows(0L, 0L);
[DllImport("user32.dll", CallingConvention = CallingConvention.StdCall, EntryPoint = "EnumWindows")]
static extern int EnumWindows(long hWnd, long lParam);
}
#endif
public int Issue3714_LocalFunctionInsideLambda()
{
int outer = 1;
#if !OPT
Action action = () => {
#else
((Action)(() => {
#endif
int inner = 2;
Local(3);
Console.WriteLine(inner);
void Local(int d)
{
inner += d;
outer += d;
}
#if !OPT
};
action();
#else
}))();
#endif
return outer;
}
public void Issue3008_DisplayClassForwardedThroughLocalFunction(int start)
{
Run();
void Run()
{
int captured = start;
A();
Console.WriteLine(captured);
void A()
{
captured++;
if (captured < 10)
{
B();
}
}
void B()
{
captured += 2;
A();
}
}
}
}
}
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