Hi i try to configure Emacs for rust :

(use-package rust-mode
    :mode (("\\.rs\\'" . rust-mode))
    :config (setq tab-width 4))

  (use-package racer
    :init (progn
            (setq racer-rust-src-path (getenv "RUST_SRC_PATH"))
            (setq racer-cmd (executable-find "racer")))
    :config (progn
              (add-hook 'rust-mode-hook #'racer-mode)
              (add-hook 'rust-mode-hook #'company-mode)
              (add-hook 'racer-mode-hook #'eldoc-mode)
              (add-hook 'rust-mode-hook
                        '(lambda ()
                           (local-set-key (kbd "M-.") #'racer-find-definition)
                           (local-set-key (kbd "TAB") #'company-indent-or-complete-common)))))

I press TAB after use std::io::B, i've got into minubuffer: No completion found

Variable racer-rust-src-path is correctly set. i try the shell command, it works :

M-x shell-command RET racer complete std::io::B
MATCH BufReader,48,11,/home/nlamirault/Apps/rust/src/libstd/io/buffered.rs,Struct,pub struct BufReader<R>
MATCH BufWriter,300,11,/home/nlamirault/Apps/rust/src/libstd/io/buffered.rs,Struct,pub struct BufWriter<W: Write>
MATCH BufRead,1200,10,/home/nlamirault/Apps/rust/src/libstd/io/mod.rs,Trait,pub trait BufRead: Read
MATCH Bytes,1528,11,/home/nlamirault/Apps/rust/src/libstd/io/mod.rs,Struct,pub struct Bytes<R>

Any idea why it doesn't work ?

Follow on from an issue on the main racer repo, where we concluded that my issue was with emacs-racer rather than racer itself: https://github.com/racer-rust/racer/issues/1020#issuecomment-468424788

Emacs version: 25.2.2 emacs-racer version: 20190124.538

I'm using racer via the emacs-racer plugin that's included with spacemacs (https://github.com/syl20bnr/spacemacs/tree/master/layers/%2Blang/rust)

When I'm editing, (for example, in this demo repo: https://github.com/kngwyu/simple-crate.git), racer completions work for the standard library, but not for external crates like rand.

Output from racer-debug:

The last racer command was:

$ cd /home/shanek/tmp/simple-crate/
$ export CARGO_HOME=/home/shanek/.cargo
$ export RUST_SRC_PATH=/home/shanek/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src
$ /home/shanek/.cargo/bin/racer complete 3 21 /home/shanek/tmp/simple-crate/src/main.rs /tmp/racer8927IeQ

This command terminated with exit code 0.

stdout:

PREFIX 32,43,AsByteSlice
END

No output on stderr.

The temporary file will have been deleted. You should be
able to reproduce the same output from racer with the
following command:

$ CARGO_HOME=/home/shanek/.cargo RUST_SRC_PATH=/home/shanek/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/src /home/shanek/.cargo/bin/racer complete 3 21 /home/shanek/tmp/simple-crate/src/main.rs

Please report bugs on GitHub.

(thing-at-point 'symbol) (here) doesn't always retrieve what we want - for instance, when describing a namespaced fn - so we may want to check it against the active region to work around this.

Emacs stalls while writing in some comments such as the comment: "// writing in this comment is broken" below. Try extending the comment with writing words longer than company-minimum-prefix-length and company-idle-delay "low-enough". Simply start tapping the "a" key repeatedly for example and the letters should appear in chunks. Not sure if this is emacs-racer or racer problem and what repo the issue should have been filed to.

// company-idle-delay 0.1 is low-enough on my system
fn main() {
    // writing in this comment is fine
}


struct A {
}


impl A {
    fn f() {
        // writing in this comment is broken
        let x = 0;
    }


    fn g() {
        // writing in this comment is fine
    }
}

So I've ran racer-mode for the first time ever... and racer errored out on missing docs, I think this case should be covered by an appropriate error message.

% racer complete std::io::B Unable to find libstd under RUST_SRC_PATH. N.B. RUST_SRC_PATH variable needs to point to the src directory inside a rust checkout e.g. "/home/foouser/src/rust/src". Current value ""/nix/store/fjghknnd4x9zpgx6hxznaiw6c7y0jr2s-rust-1.47.0-2020-10-07-18bf6b4f0/lib/rustlib/src/rust/library/libstd""

I use nix Mozilla-rust-overlay stable

  nixpkgs.latest.rustChannels.stable.rust.override {
      extensions = [ #
      # "lldb-preview"
      "clippy-preview"
      # "miri-preview"
      "rls-preview"
      # "rust-analyzer-preview"
      "rustfmt-preview"
      "llvm-tools-preview"
      "rust-analysis"
      "rust-std"
      "rustc-dev"
      # "rustc-docs"
      "rust-src"
      
      ]

Thanks

I tried my hand at issue #37. After completion, if the matchtype was a function, it tries to extract and insert the function arguments in the same way that was referenced in the issue. If there is a self argument in the beginning of the argument list, that one is not inserted.

I don't know much Emacs Lisp, so please let me know if there is a mistake or something I can improve.

As the title says. This is extremely annoying since the UI is frozen for seconds every time I stop with the cursor at for example pos 0 on a line like: pub struct .....

racer seem to activate if I rest with the cursor for more than ~1 second. racer is using 100% CPU for at least one second and emacs is frozen during this time.

rust/racer etc everything latest version and config according to documentation.

emacs 25.3 FreeBSD

Hi,

I tried to install emacs-racer using the instructions. Once installed, it loads, but for some reason it is unable to document or complete anything. As an example, here is a traceback:

Debugger entered--Lisp error: (void-variable exit-code)
  racer--call("complete" "1" "5" "/home/dsilvers/dev-rust/foo.rs" "/tmp/racer24459EKC")
  racer--call-at-point("complete")
  racer-complete()
  racer-eldoc()
  #[0 "\302 \204�\205G�\303\304!\210\304\207	\203�\303	 !\207\305 \306 \211\204$�\304\202B�

@=\2038�\307\310\"\206B�\311!\202B�\311!\206B�\307\310\"\303
!\266\203\207" [eldoc-last-message eldoc-documentation-function eldoc-display-message-p eldoc-message nil eldoc-current-symbol eldoc-fnsym-in-current-sexp apply eldoc-get-fnsym-args-string eldoc-get-var-docstring] 5 "\n\n(fn)"]()
  funcall(#[0 "\302 \204�\205G�\303\304!\210\304\207	\203�\303	 !\207\305 \306 \211\204$�\304\202B�

@=\2038�\307\310\"\206B�\311!\202B�\311!\206B�\307\310\"\303
!\266\203\207" [eldoc-last-message eldoc-documentation-function eldoc-display-message-p eldoc-message nil eldoc-current-symbol eldoc-fnsym-in-current-sexp apply eldoc-get-fnsym-args-string eldoc-get-var-docstring] 5 "\n\n(fn)"])
  eldoc-print-current-symbol-info()
  #[0 "\205�\301 \207" [eldoc-mode eldoc-print-current-symbol-info] 1 "\n\n(fn)"]()
  apply(#[0 "\205�\301 \207" [eldoc-mode eldoc-print-current-symbol-info] 1 "\n\n(fn)"] nil)
  byte-code("r\301\302H\303H\"\210)\301\207" [timer apply 5 6] 4)
  timer-event-handler([t 0 0 500000 t #[0 "\205�\301 \207" [eldoc-mode eldoc-print-current-symbol-info] 1 "\n\n(fn)"] nil idle 0])

For reference, I am using Emacs 24.4.1 on Debian

Racer fails to provide autocompletion for the following code in the listed parts.

• Ok(Response::
• Ok(Response::with((status::
• let _server = Iro (doesn't respond with 'Iron')
• let _server = Iron::
• let _server = Iron::new(hello_world).
• let _server = Iron::new(hello_world).http("localhost:3000").

This is the "Hello World" program on the frontpage of the Iron website here.

extern crate iron;

use iron::prelude::*;
use iron::status;

fn main() {
    fn hello_world(_: &mut Request) -> IronResult<Response> {
        Ok(Response::with((status::Ok, "Hello World!")))
    }

    let _server = Iron::new(hello_world).http("localhost:3000").unwrap();
    println!("On 3000");
}

Code compiles and runs using Rust 1.12.1 and Iron 1.4.0

emacs-racer 20161004.1950 racer 1.2.10

When using spacemacs and the rust layer with rust nightly (rustc 1.11.0-nightly (915b003e3 2016-06-02)), I see the following:

When I use racer through the command prompt, the signature is visible in the output.

Edit I should add that (add-hook 'racer-mode-hook #'eldoc-mode) is present in .spacemacs inside dotspacemacs/user-config.

first time using spacemacs, comes bundled with this racer. I got this error and i can't make heads or tails of it. name == censored account name

$ cd /home/name/programs/Rust/adventOfCode/
$ export CARGO_HOME=/home/name/.cargo
$ export RUST_SRC_PATH=/home/name/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library
$ /home/name/.cargo/bin/racer complete 36 9 /home/name/programs/Rust/adventOfCode/src/main.rs /tmp/racerNt0W6y

This command terminated with exit code 127.

No output on stdout.

No output on stderr.

The temporary file will have been deleted. You should be
able to reproduce the same output from racer with the
following command:

$ CARGO_HOME=/home/name/.cargo RUST_SRC_PATH=/home/name/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library /home/name/.cargo/bin/racer complete 36 9 /home/name/programs/Rust/adventOfCode/src/main.rs

As the link Racer not actively maintained completely stated about the future of racer. So, what about this project ? Will it also migrate to rust-analyzer ??

The last racer command was:

$ cd /Users/sanadkadu/github/pathOfTheRustacean/
$ export CARGO_HOME=/Users/sanadkadu/.cargo
$ export RUST_SRC_PATH=/Users/sanadkadu/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/src
$ /Users/sanadkadu/.cargo/bin/racer complete 5 15 /Users/sanadkadu/github/pathOfTheRustacean/fibonacci.rs /var/folders/xx/3k0k7xmd04d51rh7rnxy4cwc0000gn/T/racertqBgSg

This command terminated with exit code 127.

stdout:


Process *async-racer* exited abnormally with code 127

No output on stderr.

The temporary file will have been deleted. You should be
able to reproduce the same output from racer with the
following command:

$ CARGO_HOME=/Users/sanadkadu/.cargo RUST_SRC_PATH=/Users/sanadkadu/.rustup/toolchains/stable-x86_64-apple-darwin/lib/rustlib/src/rust/src /Users/sanadkadu/.cargo/bin/racer complete 5 15 /Users/sanadkadu/github/pathOfTheRustacean/fibonacci.rs

When I run racer in emacs, it says an error.

This command terminated with exit code 1.

stdout:

Unable to find libstd under RUST_SRC_PATH. N.B. RUST_SRC_PATH variable needs to point to the *src* directory inside a rust checkout e.g. "/home/foouser/src/rust/src". Current value ""/home/h3poteto/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/libstd""

No output on stderr.

$ rustc --version
rustc 1.53.0 (53cb7b09b 2021-06-17)
$ pwd
/home/h3poteto/.rustup/toolchains/stable-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library
$ ls -lha
total 72K
drwxr-xr-x 18 h3poteto h3poteto 4.0K  6月 30 21:48 .
drwxr-xr-x  4 h3poteto h3poteto 4.0K  6月 30 21:48 ..
drwxr-xr-x  5 h3poteto h3poteto 4.0K  6月 30 21:48 alloc
drwxr-xr-x  8 h3poteto h3poteto 4.0K  6月 30 21:48 backtrace
drwxr-xr-x  5 h3poteto h3poteto 4.0K  6月 30 21:48 core
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 panic_abort
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 panic_unwind
drwxr-xr-x  4 h3poteto h3poteto 4.0K  6月 30 21:48 proc_macro
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 profiler_builtins
drwxr-xr-x  2 h3poteto h3poteto 4.0K  6月 30 21:48 rtstartup
drwxr-xr-x  2 h3poteto h3poteto 4.0K  6月 30 21:48 rustc-std-workspace-alloc
drwxr-xr-x  2 h3poteto h3poteto 4.0K  6月 30 21:48 rustc-std-workspace-core
drwxr-xr-x  2 h3poteto h3poteto 4.0K  6月 30 21:48 rustc-std-workspace-std
drwxr-xr-x  5 h3poteto h3poteto 4.0K  6月 30 21:48 std
drwxr-xr-x  6 h3poteto h3poteto 4.0K  6月 30 21:48 stdarch
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 term
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 test
drwxr-xr-x  3 h3poteto h3poteto 4.0K  6月 30 21:48 unwind
$ find ~/.rustup/toolchains/stable-x86_64-unknown-linux-gnu -name "libstd"

There is no libstd in library directory. On the contrary, there is no file called libstd in the /.rustup` directory.

This issue is similar https://github.com/racer-rust/emacs-racer/issues/146 .

Hello, racer-mode along with company-mode is a great tool for writing Rust code in Emacs and I really enjoy this awesome tool. However, when I enable company-fuzzy-mode, Emacs fails to do auto-compelete. I ran racer-debug and found correct compeletions were all listed, but company-mode can not show those completions. I called company-indent-or-complete-common and it returns "no completion found".

I discovered this issue by disabling all my extensions but company-mode and racer-mode, I found they worked smoothly with each other and gave precise completions. Once company-fuzzy-mode is on, completions offered by racer-mode are not shown by company-mode.

(Honestly, I'm not sure if I should post this issue here, or to company-mode repo, or to company-fuzzy repo. The company-fuzzy repo hasn't been updated for years, perhaps it is a bug of it.)

Hi! When using eldoc, I don't like the need to match a single candidate via completing-read when there are multiple candidates.

I use company (with the company-box frontend), and it's already showing me all possible signatures. Having to interrupt my completion to match a candidate to show its signature is breaking my user experience.

I suggest a new user-customizable variable to let users choose whether or not they want the "multiple matches" prompt. If set to nil, racer--describe-at-point could show the first match, and add a hint to specify there are more possible signatures. Something like racer-eldoc-prompt-for-multiple-matches could do the trick.

Thanks in advance for the response.