Writing the Cargo.toml file when rust-analyzer is loaded produces error

[nfejzic]

Neovim version (nvim -v)

v0.9.5

Operating system/version

macOS Sonoma 14.2

Output of :checkhealth rustaceanvim

==============================================================================
rustaceanvim: require("rustaceanvim.health").check()

Checking for Lua dependencies ~
- OK [mfussenegger/nvim-dap](https://github.com/mfussenegger/nvim-dap) installed.

Checking external dependencies ~
- OK rust-analyzer: found rust-analyzer 0.3.1722-standalone (c1c9e10f7 2023-11-05)
- OK Cargo: found cargo 1.75.0 (1d8b05cdd 2023-11-20)
- OK rustc: found rustc 1.75.0 (82e1608df 2023-12-21)
- OK debug adapter: found codelldb 

Checking config ~
- OK No errors found in config.

Checking for conflicting plugins ~
- OK No conflicting plugins detected.

Checking for tree-sitter parser ~
- OK tree-sitter parser for Rust detected.

How to reproduce the issue

1. Install rustaceanvim version 4.6.0 or later
2. Open a Rust file in any Rust project (e.g. src/main.rs)
3. Let rust-analyzer start-up, then change to Cargo.toml file (without closing neovim, so that rust-analyzer remains loaded)
4. Write to Cargo.toml: :w<CR> (does not matter whether the changes were made)

Expected behaviour

rust-analyzer reloads the workspace, notification is displayed about it.

Actual behaviour

This error message appears:

Error detected while processing BufWritePost Autocommands for "*/Cargo.toml":
Error executing lua callback: ...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/lsp.lua:170: Vim:table: 0x0102721790
stack traceback:
        [C]: in function 'RustLsp'
        ...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/lsp.lua:170: in function <...al/share/nvim/lazy/rustaceanvim/lua/rustaceanvim/lsp.lua:169>

The minimal config used to reproduce this issue.

local lazypath = vim.fn.stdpath("data") .. "/lazy/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
	vim.fn.system({
		"git",
		"clone",
		"--filter=blob:none",
		"https://github.com/folke/lazy.nvim.git",
		"--branch=stable", -- latest stable release
		lazypath,
	})
end
vim.opt.rtp:prepend(lazypath)

-- Example using a list of specs with the default options
vim.g.mapleader = " " -- Make sure to set `mapleader` before lazy so your mappings are correct

require("lazy").setup({
	{
		"mrcjkb/rustaceanvim",
		version = "^4", -- Recommended
		ft = { "rust" },
		lazy = false,
	},
})

[mrcjkb]

Hey 👋

Thanks for reporting!