GeneratedRegex Attribute Failed to generate code and shows CS8795 error

[laolarou726]

Version Used:

• Visual Studio 2022 17.4.2
• .NET 7.0.100

Steps to Reproduce:

1. Create a class with GeneratedRegex

private partial class Test{
    [GeneratedRegex("(\\d+\\.?\\d*|\\d*\\.?\\d+)")]
    private static partial Regex DecimalRegex();
}

2. The error will shows

SourceGenerator does not generate anything.

Diagnostic Id:

CS8795

[jasonmalinowski]

This doesn't reproduce in 17.5.0 Preview 2.0; we'd be hearing pretty loudly if we broke this generally. @laolarou726 any idea if there's something special with your setup, or was that screenshot from a larger project where there might be some extra things impacting it?

[laolarou726]

This doesn't reproduce in 17.5.0 Preview 2.0; we'd be hearing pretty loudly if we broke this generally. @laolarou726 any idea if there's something special with your setup, or was that screenshot from a larger project where there might be some extra things impacting it?

I think this bug is randomly happening to me. Sometime I need close Visual Studio and open again then the problem will resolve.

[jasonmalinowski]

If you get to the point where you have the squiggle, if you click on the method name and invoke Go to Definition, what happens? The request may seem odd since it seems like it shouldn't work if there's a squiggle at all, but it's possible a few different systems are out of sync here.

[laolarou726]

If you get to the point where you have the squiggle, if you click on the method name and invoke Go to Definition, what happens? The request may seem odd since it seems like it shouldn't work if there's a squiggle at all, but it's possible a few different systems are out of sync here.

Sometimes it will jump to the right definition. But VS still shows error there.

[cheenamalhotra]

This is happening in VS 2022 as well in .NET 7.0 projects.

Microsoft Visual Studio Enterprise 2022
Version 17.6.0 Preview 2.0
VisualStudio.17.Preview/17.6.0-pre.2.0+33513.286
Microsoft .NET Framework
Version 4.8.09032

[onionhammer]

Same thing happening in VS Code with C# dev kit (not omnisharp), using Riok.Mapperly (which also uses source generators)

[sharwell]

@onionhammer This issue is also specific to Visual Studio (not VS Code). Can you file a new issue for the behavior you observed?