@typeparam where is not being recognized

[MarvinKlein1508]

This works in latest stable VS release but not in VS 2022 Preview 2. The code does compile successfully and everything works as expected.

To reproduce check this file:
https://github.com/MarvinKlein1508/FormPortal/blob/master/FormPortal/Components/Admin/Forms/RuleEditor.razor

[iikuzmychov]

the same problem, where keyword doesn't work when I use .NET 7.

UPD: changing .NET 7 to .NET 6 and then back to .NET 7 helped me for some reason...

UPD 2: rebuild also helps, but it leave ghost errors

[chsienki]

I hit this too, but the project F5 compiles fine, so it's something between the tooling and the design time code generation that's breaking, and I also observed switching TFM seemed to fix it.

Also reported here: https://stackoverflow.com/questions/72095268/net6-blazor-typeparam-where-constraint-error-rz1017

[davidwengier]

Ran in to this today, and also noticed that @preservewhitespace was not classified, and the compiler was reporting an error. Changing the project file in any way seemed to fix it.

[jjonescz]

Also reported here:

• https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1830677
• https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1826562
• https://dev.azure.com/devdiv/DevDiv/_workitems/edit/1823059

[MarvinKlein1508]

Just a quick site note that this actually worked back in VS17.5

[chsienki]

@davidwengier Do we think this is actually a compiler error, or something weird going on with the project system?

[davidwengier]

Thats an interesting question I had not considered, but I happen to be looking at project system code right now, so will see if I can see anything interesting.

[davidwengier]

Okay, dug in a bit, and I think this is tooling. FallbackRazorConfiguration.Latest is pointing to RazorLanguageVersion.Version3_0, when version 8 exists. Constrained generic components were introduced with version 6 it seems.

[MarvinKlein1508]

@davidwengier when will this patch be available?

[davidwengier]

@MarvinKlein1508 this will be out in the first preview of 17.8