Setting features

[steve-scott]

Our repo has multiple cargo workspaces. Each workspace has a different set of cargo features enabled. I don't know how to enable these features so that the VSCode editor correctly interprets the source code. For example, when we build in a particular workspace, we use the cargo command:

cargo build --features a,b

I don't know how to tell the IDE to enable features a and b. I have tried these settings:
Rust: All_features
Enable all Cargo features
and
Rust: Features (in settings.json)
"rust.features": [
"a",
"b"
]

Neither of these had any effect on the "squiggles" (errors) highlighted in the editor.

Is there a way to get the editor to correctly interpret the code based on the enabled features?