GNU bug report logs - #78862
31.0.50; Eglot couldn't refresh Flymake diagnostics on Rust project

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From: Eli Zaretskii <eliz <at> gnu.org>
To: joaotavora <at> gmail.com, sbaugh <at> janestreet.com
Cc: Eason Huang <aqua0210 <at> foxmail.com>, 78862 <at> debbugs.gnu.org
Subject: bug#78862: 31.0.50; Eglot couldn't refresh Flymake diagnostics on Rust project
Date: Sat, 05 Jul 2025 10:28:47 +0300

Ping!

> From: Eason Huang <aqua0210 <at> foxmail.com>
> Cc: João Távora <joaotavora <at> gmail.com>,  Spencer Baugh
>  <sbaugh <at> janestreet.com>,  78862 <at> debbugs.gnu.org
> Date: Sun, 22 Jun 2025 19:27:56 +0800
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> From: Eason Huang <aqua0210 <at> foxmail.com>
> >> Date: Sun, 22 Jun 2025 15:05:06 +0800
> >> 
> >> Hello Emacs dev,
> >> 
> >> Recently, I found that if flymake-mode enabled before eglot,eglot can not
> >> refresh the Flymake diagnostics.
> >> Disable flymake with `M-x flymake-mode`, and then enable eglot
> >> with `M-x eglot` can fix the issue. Or with the below snippet can fix
> >> it:
> >> 
> >> ```
> >> (with-eval-after-load 'eglot
> >>     (add-hook 'eglot-managed-mode-hook (lambda ()
> >>                                          (flymake-mode -1)
> >>                                          (flymake-mode 1))))
> >> 
> >> ```
> >> 
> >> Steps to reproduce:
> >> 
> >> 1. put below config into the init.el file
> >> ```
> >> (use-package flymake
> >>   :hook (prog-mode . flymake-mode))
> >> 
> >> (use-package rust-mode
> >>   :ensure t
> >>   :defer t
> >>   :custom (rust-mode-treesitter-derive (and (fboundp 'treesit-available-p)
> >>                                             (treesit-available-p))))
> >> ```
> >> 2. Start Emacs 31
> >> 3. Open any Rust project with a dependency
> >> 4. Open any Rust file in a rust project(make sure it use a dependency),
> >> such as main.rs, then flymake will report errors. Because I don't have
> >> flymake rust backends,the errors is expected.
> >>   
> >> 5. Make sure `rust-analyzer` is in the PATH,My rust toolchain is as
> >> below:
> >> 
> >> ```
> >> rustc --version
> >> rustc 1.87.0 (17067e9ac 2025-05-09)
> >> 
> >> rust-analyzer --version
> >> rust-analyzer 1.87.0 (17067e9ac6d 2025-05-09)
> >> ``
> >> 6. Start eglot with `M-x eglot`, now the errors still exist. This is the
> >> issue.
> >> 
> >> 7. `M-x flymake-mode` to disable flymake
> >> 8. `M-x eglot-reconnect` will refresh the Flymake diagnostics,and no
> >> errors reported if your Rust project is compiled.
> >> 
> >> 
> >> The issue only happened on Emacs 31, it works as expected on Emacs 30.  
> >
> > Thanks, I hope João and Spencer will have comments or suggestions
> > about this.
> >
> 
> >
> >
> 
> Hello Eli, João and Spencer,
> 
> I find out that it is related to `rust-ts-flymake-command`, when
> customize it's value to `'("cargo" "clippy")`, it works as expected.
> 
> It works with below rust config:
> 
> ```
> (use-package rust-mode
>   :defer t
>   :custom
>   (rust-mode-treesitter-derive (and (fboundp 'treesit-available-p)
>                                     (treesit-available-p)))
>   (rust-ts-flymake-command '("cargo" "clippy")))
> 
> ```
> 
> May be this information help.
> 
> -- 
> Eason Huang
> 
> 

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