roslyn: CS8795 Showing When it Shouldn't

Not sure if this is the right repo if not let me know and I can move.

When using the new LoggerMessage attribute we get errors all over the place even though this is working correctly. In case it’s relevant we use partial classes to keep the individual messages close to the code that actually uses them rather than having a single huge Log class in one place.

There is also a similar/related report on Dev Communitey here: https://developercommunity.visualstudio.com/t/issue-when-using-loggermessage-and-static-extensio/1638197

Version:

VS2022 Current (17.0.5)

Steps to Reproduce:

Put this in a new console app and install the NuGet package Microsoft.Extensions.Logging you should see the error CS8795 Partial method ‘Log.Example(ILogger)’ must have an implementation part because it has accessibility modifiers.

using Microsoft.Extensions.Logging;

internal static partial class Log
{
    [LoggerMessage(
        EventId = 0,
        Level = LogLevel.Warning,
        Message = "A message",
        SkipEnabledCheck = true)]
    public static partial void Example(this ILogger logger);
}

Expected Behavior:

There should be no error shown as this is valid code because the attribute generates the code.

Actual Behavior:

The error is shown.