Cannot build from a virtual workspace in Rust 1.40.0

[AlephAlpha]

After updating to Rust 1.40, I can no longer run cargo web build -p package in a virtual workspace. it says that:

error: error: --features is not allowed in the root of a virtual workspace

I found this line in the Chagelog of Cargo 1.40:

--features and --no-default-features in the root of a virtual workspace will now generate an error instead of being ignored. rust-lang/cargo#7507

[nic-hartley]

I'm encountering this as well.

[nico-abram]

I'm also running into this. I tried adding the verbose flag but it change nothing.

[palfrey]

This is currently breaking the virtual_manifest test

[ThibaultLemaire]

My workaround up till now was to override rust version to 1.39.0 which is the latest working version.

Except within the last month remove_dir_all was updated to v0.5.3 and now uses cfg(doctest) which is apparently experimental in rust 1.39.0, so cargo-web doesn't even build on 1.39.0 anymore. (I don't know where in the dependency tree remove_dir_all comes from, but since cargo-web doesn't freeze versions for it's dependencies, it's always the latest version that will be used.)

The only way to get it to work is to first cargo install cargo-web with the latest rust, and only then rustup override set 1.39.0 and build your project.

Link to my working CI script