Metalama.Compiler: Roslyn assert when compiling Metalama.Framework.Engine

[PostSharpBot]

When Metalama.Framework.Engine is compiled using Metalama.Compiler that merged Roslyn 4.8.0-2.final, it triggers Debug.Assert in Roslyn's Compilers\CSharp\Portable\FlowAnalysis\NullableWalker.cs (specifically, Debug.Assert(_targetTypedAnalysisCompletionOpt is null or { Count: 0 }); in NullableWalker.Free()).

This should be investigated and potentially reported to Roslyn.

[PostSharpBot]

The ticket was imported from TP-34064.
Original creator: p***o [at] postsharp.net
Original creation time: 2023-10-30T14:54:47Z
Original severity: Annoying
Original business value: Average
Original source: Internal

[PostSharpBot]

Original ticket contained comments:

2024-09-13T12:19:18Z PO:
This Blazor web app code causes a different NullableWaler assert:

class C
{
    [MapMore]
    public static void Map(WebApplication app)
    {
        app.MapGet("test", () => "HW");
    }
}

class MapMoreAttribute : OverrideMethodAspect
{
    public override dynamic? OverrideMethod()
    {
        var result = meta.Proceed();

        meta.Target.Parameters.Single().Value!.MapGet("test2", (Delegate)(() => 42));

        return result;
    }
}