hangs during rustfmt when saving

[antifuchs]

I'm just trying out rustic, and it feels really cool! Unfortunately, I'm running into a weird problem: When I save a rust file with rustic-format-on-save set to t, emacs hangs. I used toggle-debug-on-quit, used C-x C-s, waited a bit and then hit C-g; I got this backtrace:

Debugger entered--Lisp error: (quit)
  rustic-before-save-hook()
  run-hooks(before-save-hook)
  basic-save-buffer(t)
  save-buffer(1)
  funcall-interactively(save-buffer 1)
  call-interactively(save-buffer nil nil)
  command-execute(save-buffer)

I suspect this is an interaction with something else on the before-save-hook, so here's what's on there:

(eglot--signal-textDocument/willSave rustic-before-save-hook t)

I set rustic-rls-pkg to eglot, could that be related?

[antifuchs]

(Update: I tried setting rustic-rls-pkg to lsp-mode, installed lsp-mode and restarted emacs; saving still hangs).

[brotzeit]

Did you try it with a minimal config ? I mean only rustic + eglot/lsp-mode.

[brotzeit]

@antifuchs I made some changes and hopefully it works now. If not, please open another issue. Thanks for the bug report.