Rust GoTo support doesn't work with standard library

[palango]

When using the rust plugin the GoTo command works fine as long as I jump in the project or the dependency crates. However, I can't follow links to the standard library. When I try this I get the following message:

Runtime Error: Can't jump to definition.

The rust sources are there and set by g:ycm_rust_src_path and completion works fine. I'm on MacVim 7.4 (88) with YCM installed today.

[vheon]

I don't know if is a limitation of racer

ping @jwilm

[jwilm]

@palango can you please provide the output from :let g:ycm_rust_src_path in vim and maybe a stat or better yet a tree -L 1 of whatever the value is set to?

Thanks!

[palango]

Ok, thanks for the responses. Tell me if you need anything else.

:let g:ycm_rust_src_pathreturns g:ycm_rust_src_path /Users/paul/Projects/rust/rustc-latest-src/src.

tree -L 1in the directory above gives the following, it's the rust 1.5 sources:

○ % tree -L 1                                                                               2:04:44
.
├── compiler-rt
├── compiletest
├── doc
├── driver
├── error-index-generator
├── etc
├── jemalloc
├── liballoc
├── liballoc_jemalloc
├── liballoc_system
├── libarena
├── libbacktrace
├── libcollections
├── libcollectionstest
├── libcore
├── libcoretest
├── libflate
├── libfmt_macros
├── libgetopts
├── libgraphviz
├── liblibc
├── liblog
├── librand
├── librbml
├── librustc
├── librustc_back
├── librustc_bitflags
├── librustc_borrowck
├── librustc_data_structures
├── librustc_driver
├── librustc_front
├── librustc_lint
├── librustc_llvm
├── librustc_mir
├── librustc_platform_intrinsics
├── librustc_privacy
├── librustc_resolve
├── librustc_trans
├── librustc_typeck
├── librustc_unicode
├── librustdoc
├── libserialize
├── libstd
├── libsyntax
├── libterm
├── libtest
├── llvm
├── rt
├── rust-installer
├── rustbook
├── rustllvm
├── snapshots.txt
└── test

52 directories, 1 file

[jwilm]

While you have vim open, can you do a ps aux | grep racerd and paste that output here?

[palango]

○ % ps aux | grep racerd                                                                    2:04:48
paul            83036   0.0  0.0  2600472   2896   ??  S     5:04PM   0:00.09 /Users/paul/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/racerd/target/release/racerd serve --port 65486 -l --secret-file /var/folders/gz/0f_3f9k96gd1hblwgd1r8h280000gn/T/tmp6175yM --rust-src-path /Users/paul/Projects/rust/rustc-latest-src/src
paul            83498   0.0  0.0  2434836    748 s000  S+    2:15AM   0:00.00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn racerd

[jwilm]

Hmm. And do you have a RUST_SRC_PATH env var set?

[palango]

@jwilm: No, it's not set.

Update: seems like that was the problem, when I set it it works fine.

[jwilm]

@palango That's not supposed to be necessary :P. Well, I guess that's the workaround in the mean time. This is a bug in either ycmd's rust completer or racerd. Would you mind sharing your racerd/ycmd (both stdout and stderr) logs from when you had the issue? They could be useful for tracking down the issue. You might have to recreate it since ycm doesn't keep log files by default. You can get their location via :YcmDebugInfo after doing a rust completion or goto.

[jwilm]

This also highlights the need for additional information in :YcmDebugInfo so I can just ask people to provide that in the future :).

Thanks!!!

[palango]

Do you want the logs with the RUST_SRC_PATH set or not.
The log attached is with working completion (at least the end, in the beginning there are some exceptions):
log.txt

[jwilm]

Without the environment variable set, please.

[palango]

Seems to be my bad, I might have tried it on functions and/or macros.

Even with the env variable deleted it works fine for structs and traits. I understand that functions are hard to match, but macros should be doable?

[jwilm]

Functions should be fine. There's not support in racer for macros, yet.

[palango]

I attached a new log, this time without the env variable set.

Some strange behaviour I noticed now, in the following code. GoTo on the read_to_string function works fine, but doesn't work for find_iter.

let _ = res.read_to_string(&mut content);
let count = re.find_iter(content.as_ref()).count());

log2.txt

[jwilm]

Awesome information. Thanks for providing all of that in addition to the initial report.

[ngortheone]

@jwilm any updates on this? I am affected by the same problem.
I am on OSX, using nvim and symptoms are the same - completion and GoTo for some things in stdlib do not work. Minimal working snippet (guess game from the book)

    let mut guess = String::new();

    io::stdin().read_line(&mut guess)
        .expect("Failed to read line");

    let guess: u32 = guess.trim().parse()
        .expect("Please type a number");

trim() and parse() are neither being autocompleted nor I am able to jump to definition with GoTo

But I can see other completions that work (trim and parse are not found in that list)

I do not have g:ycm_rust_src_path set and ps aux | grep racerd shows
--rust-src-path /Users/ihorantonov/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/src

[bstaletic]

RLS support has been merged.