InvalidProgramException: Common Language Runtime detected an invalid program (Debug-only) #124425
Description
Description
As the title says.
Reproduction Steps
#nullable enable
Console.WriteLine("Begin.");
Console.WriteLine(Foo(v: null));
Console.WriteLine("Finished.");
static string? Foo(System.Numerics.Vector2? v = null)
{
return Bar(nameof(v), v);
}
static string? Bar<T>(string name, T? value)
{
if (value == null) { return "(null)"; }
string? valueStr;
if (typeof(T) == typeof(System.Numerics.Vector2?))
{
var v = (System.Numerics.Vector2?)(object?)value;
valueStr = v.HasValue ? $"[{v}]" : "(null)";
}
else if (typeof(T) == typeof(System.Numerics.Vector2))
{
var v = (System.Numerics.Vector2)(object)value!;
valueStr = $"[{v}]";
}
else
{
valueStr = value?.ToString() ?? "(null)";
}
return valueStr;
}dotnet run Program.cs -c Debug
Begin.
Unhandled exception. System.InvalidProgramException: Common Language Runtime detected an invalid program.
at Program.<<Main>$>g__Bar|0_1[T](String name, T value)
at Program.<<Main>$>g__Foo|0_0(Nullable`1 v) in Program.cs:line 8
at Program.<Main>$(String[] args) in Program.cs:line 3
dotnet run Program.cs -c Release
Begin.
(null)
Finished.
🤔 😕 💻 💥
Expected behavior
I expected a valid CIL and no CLR crash. The program should produce the same output regardless of configuration, whether the program is compiled with <Optimize>false</Optimize> (which is the case for Debug configuration). In other words, it should work and print out:
Begin.
(null)
Finished.
Actual behavior
As the title says.
Common Language Runtime detected an invalid program. But this only happens when program is compiled in Debug configuration (<Optimize>false</Optimize> a.k.a. /p:Optimize=false).
Regression?
No response
Known Workarounds
My current workaround is to use pattern matching:
#nullable enable
Console.WriteLine("Begin.");
Console.WriteLine(Foo(v: null));
Console.WriteLine("Finished.");
static string? Foo(System.Numerics.Vector2? v = null)
{
return Bar(nameof(v), v);
}
static string? Bar<T>(string name, T? value)
{
if (value == null) { return "(null)"; }
string? valueStr;
if (value is System.Numerics.Vector2 vector2)
{
valueStr = $"[{vector2}]";
}
else
{
valueStr = value?.ToString() ?? "(null)";
}
return valueStr;
}Configuration
dotnet --info
.NET SDK:
Version: 10.0.103
Commit: c2435c3e0f
Workload version: 10.0.103
MSBuild version: 18.0.11+c2435c3e0
(On Windows 10 x64, but I think that's irrelevant.)
Other information
No response