No non-local Rust completion

[sbmueller]

Issue Prelude

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Issue Details

Provide a clear description of the problem, including the following key
questions:

• What did you do?

Installed YCM with --rust-completer. Opened a .rs file and started to code, for instance YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common/src/main.rs.

• What did you expect to happen?

When typing let a = Vec::n I expect to see a completion suggestion like new f pub const fn new() -> Vec<T>.

• What actually happened?

Not all possible suggestions are shown.

Turns out only local completion works, for instance builder.bui:

"Global" completion, for instance from standard library does not work.

Diagnostic data

Output of vim --version

VIM - Vi IMproved 8.1 (2018 May 18, compiled Jun  5 2019 17:57:58)
macOS version
Included patches: 1-1368
Compiled by MacPorts
Huge version without GUI.  Features included (+) or not (-):
+acl               +cmdline_info      -farsi             +libcall           -mouse_sysmouse    +python3           +termguicolors     +vreplace
+arabic            +comments          +file_in_path      +linebreak         +mouse_urxvt       +quickfix          +terminal          +wildignore
+autocmd           +conceal           +find_in_path      +lispindent        +mouse_xterm       +reltime           +terminfo          +wildmenu
+autochdir         +cryptv            +float             +listcmds          +multi_byte        +rightleft         +termresponse      +windows
-autoservername    -cscope            +folding           +localmap          +multi_lang        -ruby              +textobjects       +writebackup
-balloon_eval      +cursorbind        -footer            -lua               -mzscheme          +scrollbind        +textprop          -X11
+balloon_eval_term +cursorshape       +fork()            +menu              +netbeans_intg     +signs             +timers            -xfontset
-browse            +dialog_con        +gettext           +mksession         +num64             +smartindent       +title             -xim
++builtin_terms    +diff              -hangul_input      +modify_fname      +packages          +startuptime       -toolbar           -xpm
+byte_offset       +digraphs          +iconv             +mouse             +path_extra        +statusline        +user_commands     -xsmp
+channel           -dnd               +insert_expand     -mouseshape        -perl              -sun_workshop      +vartabs           -xterm_clipboard
+cindent           -ebcdic            +job               +mouse_dec         +persistent_undo   +syntax            +vertsplit         -xterm_save
-clientserver      +emacs_tags        +jumplist          -mouse_gpm         +postscript        +tag_binary        +virtualedit
+clipboard         +eval              +keymap            -mouse_jsbterm     +printer           -tag_old_static    +visual
+cmdline_compl     +ex_extra          +lambda            +mouse_netterm     +profile           -tag_any_white     +visualextra
+cmdline_hist      +extra_search      +langmap           +mouse_sgr         -python            -tcl               +viminfo
   system vimrc file: "/opt/local/etc/vimrc"
     user vimrc file: "$HOME/.vimrc"
 2nd user vimrc file: "~/.vim/vimrc"
      user exrc file: "$HOME/.exrc"
       defaults file: "$VIMRUNTIME/defaults.vim"
  fall-back for $VIM: "/opt/local/share/vim"
Compilation: /usr/bin/clang -c -I. -Iproto -DHAVE_CONFIG_H   -I/opt/local/include -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platf
orm/Developer/SDKs/MacOSX10.14.sdk -DMACOS_X -DMACOS_X_DARWIN  -pipe -Os -isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Devel
oper/SDKs/MacOSX10.14.sdk -arch x86_64 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1
Linking: /usr/bin/clang   -L/opt/local/lib -Wl,-headerpad_max_install_names -Wl,-syslibroot,/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.plat
form/Developer/SDKs/MacOSX10.14.sdk -arch x86_64 -o vim        -lm  -lncurses -liconv -lintl -framework AppKit     -L/opt/local/Library/Frameworks/Python.fr
amework/Versions/3.7/lib/python3.7/config-3.7m-darwin -lpython3.7m -framework CoreFoundation

Output of YcmDebugInfo

Printing YouCompleteMe debug information...
-- Client logfile: /var/folders/zl/jgzhpvtx79jg0d_br665jj2r0000gn/T/ycm_kfeebm_4.log
-- Server Python interpreter: /opt/local/bin/python
-- Server Python version: 3.7.3
-- Server has Clang support compiled in: True
-- Clang version: clang version 8.0.0 (tags/RELEASE_800/final)
-- Extra configuration file found and loaded
-- Extra configuration path: /Users/senpo/.vim/plugged/YouCompleteMe/third_party/ycmd/.ycm_extra_conf.py
-- Rust completer debug information:
--   Rust Language Server running
--   Rust Language Server process ID: 13216
--   Rust Language Server executable: /Users/senpo/.vim/plugged/YouCompleteMe/third_party/ycmd/third_party/rls/bin/rls
--   Rust Language Server logfiles:
--     /var/folders/zl/jgzhpvtx79jg0d_br665jj2r0000gn/T/rust_language_server_stderrw8if9i6r.log
--   Rust Language Server Server State: Initialized
--   Rust Language Server Project Directory: /Users/senpo/.vim/plugged/YouCompleteMe/third_party/ycmd/ycmd/tests/rust/testdata/common
--   Rust Language Server Settings: {}
--   Rust Language Server Project State: Indexing done, building done
--   Rust Language Server Version: 1.36.0 (9692ca8 2019-05-18)
-- Server running at: http://127.0.0.1:51750
-- Server process ID: 13211
-- Server logfiles:
--   /var/folders/zl/jgzhpvtx79jg0d_br665jj2r0000gn/T/ycmd_51750_stdout_6kaci2ov.log
--   /var/folders/zl/jgzhpvtx79jg0d_br665jj2r0000gn/T/ycmd_51750_stderr_03umrcb_.log

Contents of YCM, ycmd and completion engine logfiles

https://www.dropbox.com/s/239s6sn2h7g4veu/rust_language_stderr.log?dl=0
https://www.dropbox.com/s/yyjp8tyzwsucdq2/ycmd_stderr.log?dl=0

OS version, distribution, etc.

macOS 10.14.6

Output of build/install commands

https://www.dropbox.com/s/d7ov0o2cffjgvgq/installation.log?dl=0

I already hat a length discussion on Gitter with @bstaletic . He made sure I'm on the newest YCM commit and confirmed he gets the same installation output. Besides the OS difference (macOS - Linux) we seem to have identical setups, however completion works for him and not for me. Any help would be appreciated!

[bstaletic]

To rehash my conclusion after our discussion, it looks like RLS doesn't find the standard library, which we do install along side RLS. I wouldn't be surprised if this is a symptom of macOS, as we have had that with C already.

@puremourning Could you try to repro the issue on your macOS?

[tanhuacheng]

I have the same problem on "Ubuntu 16.04.1"

[tanhuacheng]

I solved this problem by install rls to $HOME/.rustup where is the place i am install rust toolchain. it's also installed to third_party/ycmd/third_party/rls/ by ycm, but it seems rls not use them.

rustup component add rls rust-analysis rust-src

[bstaletic]

@puremourning Can you give this a test? I can't reproduce the error on linux.

[vasilakisfil]

I have the same problem on linux, what @tanhuacheng said helped me.

[puremourning]

@puremourning Can you give this a test?

Sure. I get the same behaviour as the OP.

However, all the tests pass.

(system3) BenMBP:ycmd ben$ ./run_tests.py --skip-build ycmd/tests/rust
...
----------------------------------------------------------------------
Ran 52 tests in 6.487s

OK

In the racer days you used to have to have the standard library sources installed and configured. Is that still the case ?

[bstaletic]

However, all the tests pass.

Because our completion tests cover only crate-local completion, no dependencies, including the standard library.

In the racer days you used to have to have the standard library sources installed and configured. Is that still the case ?

Right now we are installing rust-src, along with rls and rust-analysis into third_party. That's where we install the entire toolchain. It's supposed to magically work. And it does magically work for me.

[puremourning]

If it's of help: here's the rls log

[puremourning]

Actually, I think that's truncated. the log is 12,381 lines.

Anyone else surprised the log file for the worlds most trivial operation in the worlds most trivial file is 12381 lines ?!

[bstaletic]

Yeah, RLS logs are insane. I compared the rls log with @sbmueller in our gitter room. My log was longer than his and contained things like Vec from the standard library, but I couldn't figure out where the difference lies.

The difference was a couple hundred lines extra in my log.

[bstaletic]

@puremourning Try searching your log for third_party and even files from the standard library that we installed there.

[puremourning]

well it has this stuff:

[2019-11-09T15:05:31Z TRACE rls_analysis::raw] Considering analysis files at /Users/ben/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/rls/lib/rustlib/x86_64-apple-darwin/analysis
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 124874195 }), name: "libunicode_width-40bc6477848e2242.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125012740 }), name: "librustc_std_workspace_alloc-df043cce83b6dd34.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125063255 }), name: "libtest-e6dd79af2b4837e4.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125074294 }), name: "libbacktrace_sys-0f0fd6cb2d0ffa02.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125096018 }), name: "libcompiler_builtins-967a7c840affa3a2.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125330072 }), name: "libpanic_abort-fbfbc94b9e906545.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125392918 }), name: "libpanic_unwind-b8538eedc7e0aa47.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125503187 }), name: "libgetopts-3ef2c6cfd08ec619.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125504903 }), name: "libunwind-0f97cfed0ef82f67.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125507896 }), name: "librustc_asan-c55565a4d1001279.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125662214 }), name: "libterm-5465c10bfd8f7eb9.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125705829 }), name: "librustc_std_workspace_std-559733ba22bce6da.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125840702 }), name: "librustc_std_workspace_core-aededee92e955f4b.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 125849298 }), name: "librustc_demangle-03c3af5ce910211b.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 126086680 }), name: "libbacktrace-c7f6a23a8e1e3f0d.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 126467655 }), name: "liblibc-9cd6fde8086e33c8.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 126964569 }), name: "libstd-a104564b5cd85c3c.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 128484584 }), name: "libhashbrown-17cc4f6d2f17ab1d.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 130485219 }), name: "libproc_macro-d6e25d02026e6a1e.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 151211749 }), name: "libcore-093e765cd9bdca1f.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 154954434 }), name: "liballoc-ac5b59d7ac33292f.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 155188046 }), name: "libprofiler_builtins-9daebda0ed41b83f.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 155255466 }), name: "librustc_tsan-3adcd27409d789cf.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] Considering Listing { kind: File(SystemTime { tv_sec: 1573311800, tv_nsec: 155310726 }), name: "libcfg_if-6308b422d34f5adf.json" }
[2019-11-09T15:05:31Z INFO  rls_analysis::raw] reading 0 crates from /Users/ben/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/rls/lib/rustlib/x86_64-apple-darwin/analysis in 0.000309100s

And refs to the vec source:

[2019-11-09T15:03:48Z TRACE rls_analysis::lowering] record def: Id(21474840201)/Id { krate: 0, index: 3721 } (5): Def { kind: Mod, span: Span { file: "/Users/ben/.vim/bundle/YouCompleteMe/third_party/ycmd/third_party/rls/lib/rustlib/src/rust/src/liballoc/vec.rs", range: Range { row_start: Row(0, PhantomData), row_end: Row(0, PhantomData), col_start: Column(0, PhantomData), col_end: Column(0, PhantomData) } }, name: "vec", qualname: "alloc::vec", distro_crate: true, parent: None, value: "src/liballoc/vec.rs", docs: " A contiguous growable array type with heap-allocated contents, written\n `Vec<T>`." }

[bstaletic]

After filtering the RLS log with :v/\<Vec\>/d, this is my output: https://gist.github.com/bstaletic/1dd345c5df5ed3f6118d20cb51c84b61

[bstaletic]

I've updated the gist with the log filtered to only contain references to ycmd/third_party/rls/lib/rustlib/src/rust/src/liballoc/vec.rs.

[bstaletic]

For the record, I managed to repro the issue. I forgot that I had rust-src installed globally. After rustup component remove rust-src the issue was trivial to reproduce.