Installing rust-src seems to miss some component

[ylabidi]

Problem
After rust-src is seemingly successfully installed, I still get error from emacs/racer about failing to find the sources at the expected path. And sure enough that path doesn't exist:

eldoc error: (user-error No such directory:                │
/home/user/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src. Please set   ‘racer-rust-src-path’ or ‘RUST_SRC_PATH’)

The actual tree there is as follows:

$ ls ~/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/
Cargo.lock  library

Steps

1. Install rust-src
2. edit a rust file with a configured emacs editor
3. emacs keeps complaining about sources not available

[ehuss]

(Duplicate of #2522.)

The directory was renamed to library. Racer was updated in racer-rust/racer#1130 to use the new directory, but it looks like the README was not updated. Perhaps file an issue on the racer repo?

EDIT: Or, you may want to check if your installation of racer is out of date, I'm not sure if a new version is available.

[ylabidi]

Thanks, I'll build racer off the latest source and see if it solves the issue.

[ylabidi]

Just an FYI for whoever stumbles on this with a similar configuration (emacs + rustic + rls), it seems updating racer has no effect, because in this case rls handles the completion and it uses racer as a library to that effect, and it seems it's still built against an older version of racer.