I just noticed the following in the tooltip of an error in VS 2017:

I doubt this is a bug, but it confused me a little. Does it mean it is waiting for tasks to complete? Or does it signify something otherwise sensible?

Repro steps

The error can be seen, among others, with this code snippet (the actual error is sound, the bug report is about the mysterious "O"):

type ObjectWithPrivCtor private (x: string) =
    static member X = ()
    
module SomeModule =
    let Create x = ObjectWithPrivCtor(x)

Expected behavior

Not sure, some text perhaps? On most objects, it would show the declaration, i.e. in this case, it should show this (but then the error underneath):

Actual behavior

The Big O ;)

Known workarounds

None

Related information

VS 2017, 15.9.5