"Can't find crate" for extern (even after cargo build)

[mgalgs]

I'm new to rust, so maybe I'm doing something silly, but I seem to be having troubles getting flycheck-rust to recognize any external dependencies whatsoever. I've put together a minimal demo repo that shows the problem for a crates.io dependency as well as a local dependency: https://github.com/mgalgs/flycheck-rust-test

In frsub/lib.rs in that repo, I'm trying to extern a crate from crates.io which is present in my Cargo.toml, but flycheck-rust complains about not being able to find it (even after running cargo build from the frsub directory).

In src/main.rs in that repo, I'm trying to extern in the frsub crate by path (see Cargo.toml at the top-level).

What am I missing here?

[mkpankov]

@mgalgs it's the same as #8

Currently Flycheck is unable to get proper search paths of crates which are used by Cargo.

[swsnr]

Closing as duplicate then.