I think I solved the puzzle why things in Manifest.toml were being reported as “Missing References” in VS Code: There are two values that turn that reporting on, all and symbols.
It needs to be set to symbols so that only Julia file are taken into consideration.
That leaves the question why so many objects are being reported as “Missing References”
when clearly they should be known. Example:
ACol is the current environment, so why the missing references on line 4?
I wonder if it has anything in common with the apparent problem VS Code has with
suggesting completions from the current package?