Regression from stable to beta: examples dir in workspace top-level

[jonhoo]

In tower, we have a root-level examples/ directory in a workspace. This means that we also have to list [dev-dependencies] in the root-level Cargo.toml. This works just fine on the current stable (1.31.1), but fails to compile on 1.32 beta and nightly with:

error: failed to parse manifest at `/home/jon/dev/others/tower/Cargo.toml`

Caused by:
  virtual manifests do not specify [dev-dependencies]

Seems like an unwanted regression from stable?

[ehuss]

I'm not sure if I understand your setup. How is examples/channel_service.rs used? Cargo has never read dependencies from a virtual manifest, so an error was added to indicate the format is not valid (rust-lang/cargo#6276).

[jonhoo]

I'll leave that question to @carllerche as I'm not the one who set up the crate :)

[jonas-schievink]

Should this issue be moved to Cargo instead?

[jonas-schievink]

Closing in favor of a Cargo issue, but I think this is intentional and never actually worked (the section was just ignored)