Blazor typeparam constraints causing compilation error CS0449

[xiety]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

Problem looks like the closed dotnet/aspnetcore#38479, dotnet/aspnetcore#38041 and dotnet/razor-compiler#272, but dotnet/razor-compiler#44 doesn't fix it in the latest 7.0.100-rc.1.22363.3

Generated code with constraints in wrong order:

where T : global::System.IComparable, class

Produces compilation error:

CS0449	The 'class', 'struct', 'unmanaged', 'notnull', and 'default' constraints cannot be combined or duplicated, and must be specified first in the constraints list.

Expected Behavior

Code is generated without errors:

where T : class, global::System.IComparable

Steps To Reproduce

App.razor

<MyComponent Parameter="1" />

MyComponent.razor

@typeparam T where T : class, IComparable

@code
{
    [Parameter]
    public T Parameter { get; set; } = default!;
}

Exceptions (if any)

No response

.NET Version

7.0.100-rc.1.22363.3

Anything else?

No response

[javiercn]

@xiety thanks for contacting us.

How are you trying against the 7.0.100-rc.1.22363.3, I am pretty sure that we fixed this issue way back, so maybe you are not setting the SDK correctly?

[xiety]

I see here that types are added to the list first and then other constraints:

https://github.com/dotnet/razor-compiler/blob/55e950892723d077c2707450ae8a8218bf4abc9c/src/Microsoft.CodeAnalysis.Razor/src/ComponentTagHelperDescriptorProvider.cs#L343

[javiercn]

@xiety nevermind, I just tried this in a container and you are right.

[s-e-f]

I am also running into this problem, I mentioned it in another issue: #7074

[chsienki]

Duplicate of #7074