Compiler Crash on Equality Comparison of a Tuple Casted from dynamic

[Jason5Lee]

Version Used: .NET 9.0.0

Steps to Reproduce:

1. Compile the following C# code (SharpLab Link):
   • The code involves casting a dynamic value to a tuple and performing an equality comparison on another tuple.

public class C {
    public static bool Test(dynamic o) =>
        (((int, int))o) == (2, 3);
}

Expected Behavior: The compiler compiles the code without crashes.

Actual Behavior:

• The compilation process fails in Visual Studio with the error:

  "csc.exe" exited with code -2146232797

• Additional details, including a stack trace, are available in the linked SharpLab page.

[jjonescz]

System.InvalidOperationException: Unexpected value 'ExplicitDynamic' of type 'Microsoft.CodeAnalysis.CSharp.ConversionKind'
   at Microsoft.CodeAnalysis.CSharp.CodeGen.CodeGenerator.EmitConversion(BoundConversion conversion)