YCM references rust_src_path instead of g:ycm_rust_src_path

[Emilgardis]

This issue has been changed to track how ycm mentions the incorrect variable

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Issue Details

This issue is most likely related to #2579 and #2581

YCM reports RuntimeError: Rust sources path does not exist. Check the value of the rust_src_path option or the RUST_SRC_PATH environment variable. with :YcmShowDetailedDiagnostic and other commands. It also doesn't autocomplete ::std, external or local code.

The src path is set to
g:rust_src_path /home/localsys/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src which is reportedly working with a call to complete using a separate installation of racer. This racer installation is able to autocomplete both ::std and external code.

This problem started earlier today after previously working and I decided that upgrading YCM could make it fix itself, but no change has been seen.

Logfiles where obtained by opening a .rs file, and then doing :YcmShowDetailedDiagnostics

Diagnostic data

Output of vim --version

Vim +huge. (full build here )

Output of YcmDebugInfo

Printing YouCompleteMe debug information...
-- Client logfile: /tmp/ycm_k9ewt447.log
-- Server Python interpreter: /usr/bin/python
-- Server Python version: 3.6.0
-- Server has Clang support compiled in: False
-- Clang version: None
-- No extra configuration file found
-- Server running at: http://127.0.0.1:42301
-- Server process ID: 12570
-- Server logfiles:
--   /tmp/ycmd_42301_stdout_pmiv7krv.log
--   /tmp/ycmd_42301_stderr_2dcuta9g.log

Contents of YCM, ycmd and completion engine logfiles

YCM Logfiles

OS version, distribution, etc.

Arch linux

[micbou]

The option is g:ycm_rust_src_path, not g:rust_src_path. Could you try again with the correct name?

[Emilgardis]

setting g:ycm_rust_src_path /home/localsys/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src seems to have fixed the problem, I'm unsure why it worked previously.
I'll repurpose this issue to track the incorrect reference to g:rust_src_path instead of g:ycm_rust_src_path.

Why does ycm not use the latter?

[micbou]

All options from ycmd (the server to which YCM talks) are prefixed with ycm_ to avoid name clashes with other plugins. Since the error comes from the server, rust_src_path is mentioned, not g:ycm_rust_src_path (that's also why there is no g:).

[Emilgardis]

I've submitted ycm-core/ycmd#729 to take care of this.

[wfxr]

It's strange. When I set with g:ycm_rust_src_path, YCM will not work for rust. And when remove the prefix ycm_, YCM work properly.

[bstaletic]

@wfxr My bet would be something else setting g:ycm_rust_src_path when you use g:rust_src_path. And it sets it up correctly. Check with :echo g:ycm_rust_src_path.

[wfxr]

@bstaletic :echo g:ycm_rust_src_path shows nothing but :echo g:rust_src_path shows right path I set.

[bstaletic]

Like @micbou explained, the options are prefixed with g:ycm_ in YCM, but there is no prefix on the server. Closing as this is not really a bug.