Invalid decompilation of switch expression with no default case

[mmusu3]

Input code

using System;
class IncompleteSwitchExpressionTest
{
    static int Test(StringComparison c)
    {
        return c switch {
            StringComparison.Ordinal => 0,
            StringComparison.OrdinalIgnoreCase => 1,
        };
    }
}

Erroneous output

internal class IncompleteSwitchExpressionTest
{
	private static int Test(StringComparison c)
	{
		switch (c)
		{
		case StringComparison.Ordinal:
			return 0;
		case StringComparison.OrdinalIgnoreCase:
			return 1;
		default:
		{
			global::<PrivateImplementationDetails>.ThrowSwitchExpressionException(c);

			int result = default(int);

			return result;
		}
		}
	}
}

When a switch expression does not specify a default case the compiler will add one that throws a SwitchExpressionException or a InvalidOperationException on older runtimes.
The decompiled code cannot recompile as <PrivateImplementationDetails> is not a valid identifier.

Details

• Product in use: ILSpy 9.0 VS extension