bad error message for crate not part of a workspace inside a directory spanning a workspace

[gnzlbg]

I have a workspace with a couple of crates, and want to add a new crate inside the directory which is not part of the workspace. I get following error message:

error: current package believes it's in a workspace when it's not:
current:   /workspace/foo/Cargo.toml
workspace: /workspace/Cargo.toml

this may be fixable by adding `foo` to the `workspace.members` array of the manifest located at: /workspace/Cargo.toml

The error message suggest the alternative of making the crate part of the workspace, but this is not what I want. It should also suggest how to make the current package not believe that it is in a workspace.

The way I solved it is by adding the following to the foo crate's Cargo.toml;

[workspace] 
members = [] 

EDIT: Arnavion suggested on IRC that this is actually a bug and how I solved this just a workaround.

[gnzlbg]

Duplicate of #5418 .