Code action "fill match arms" adds extra } inside #[tokio::main]

[mawkler]

rust-analyzer version: 2024-09-02

rustc version: rustc 1.80.1 (3f5fd8dd4 2024-08-06)

editor or extension: Neovim + nvim-lspconfig. Here's my full (minimal) config:

Click to expand

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)

-- install plugins
require('lazy').setup({
  "folke/tokyonight.nvim",
  {
    'neovim/nvim-lspconfig',
    dependencies = {
      { 'williamboman/mason.nvim', config = true },
      'williamboman/mason-lspconfig.nvim',
      'WhoIsSethDaniel/mason-tool-installer.nvim',
    },
    config = function()
      require('mason').setup()

      local servers = {}

      require('mason-tool-installer').setup {
        ensure_installed = { 'rust-analyzer' },
      }

      require('mason-lspconfig').setup {
        handlers = {
          function(server_name)
            local server = servers[server_name] or {}
            require('lspconfig')[server_name].setup(server)
          end,
        },
      }
    end,
  },
})

relevant settings: I need to have tokio installed for the bug to appear

repository link (if public, optional): ?

code snippet to reproduce:

#[tokio::main]
fn main() {
    match true {}
}

After executing the code action "Fill match arms" on match true:

#[tokio::main]
async fn main() {
    match true {
    true => todo!(),
    false => todo!(),
}} // <-- notice the extra `}`
}

If I remove #[tokio::main] I no longer have this issue.

Here's my Cargo.toml:

[package]
name = "rust-test"
version = "0.1.0"
edition = "2021"

[dependencies]
tokio = { version = "1.39.3", features = ["full"] }