require'lspconfig'.rust_analyzer.setup {
  cmd = vim.lsp.rpc.connect("127.0.0.1", 27631),
  -- When using unix domain sockets, use something like:
  --cmd = vim.lsp.rpc.domain_socket_connect("/path/to/ra-multiplex.sock"),
  init_options = {
    lspMux = {
      version = "1",
      method = "connect",
      server = "rust-analyzer",
    },
  },
}