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

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From: Spencer Baugh <sbaugh <at> janestreet.com>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: aqua0210 <at> foxmail.com, 78862 <at> debbugs.gnu.org, João Távora <joaotavora <at> gmail.com>
Subject: bug#78862: 31.0.50; Eglot couldn't refresh Flymake diagnostics on Rust project
Date: Sat, 19 Jul 2025 07:31:01 -0400

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I'm working on this.

On Sat, Jul 19, 2025, 3:04 AM Eli Zaretskii <eliz <at> gnu.org> wrote:

> Ping! Ping! João and Spencer, please respond.
>
> > Cc: Eason Huang <aqua0210 <at> foxmail.com>, 78862 <at> debbugs.gnu.org
> > Date: Sat, 05 Jul 2025 10:28:47 +0300
> > From: Eli Zaretskii <eliz <at> gnu.org>
> >
> > 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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