Incorrect error formatting for generic attribute missing errors

[333fred]

Version Used: 5fcefbe

Steps to Reproduce:

[SomeAttribute<int>] // error CS0246: The type or namespace name 'SomeAttribute<>Attribute' could not be found (are you missing a using directive or an assembly reference?)
void Foo() {}

Sharplab

Diagnostic Id: CS0246

Expected Behavior:

The type or namespace name 'SomeAttributeAttribute<>' could not be found (are you missing a using directive or an assembly reference?)

Actual Behavior:

The type or namespace name 'SomeAttribute<>Attribute' could not be found (are you missing a using directive or an assembly reference?)

[333fred]

Important note: there is no issue with the actual check. SomeAttributeAttribute<T> resolves correctly. It's just the error message that's wonky.

[kinkeadian25]

Hi, been a bit to work on anything with roslyn cause I was getting up to speed on my new job, but ready to start working on my favorite project again! @CyrusNajmabadi, @jcouv, or @333fred. Is it cool if I take this one?

Edit: Went ahead and just subitted a PR

[CyrusNajmabadi]

Is it cool if I take this one?

Totally :-)