My config for rustaceanvim so far. And some experiences.

[zjp-CN]

• vim.g.rustaceanvim is already set in LazyVim, but yours are prior and merged.
• to remain the test window behavior from rust-tools.nvim instead of pop-up, set test_executor = "termopen"
  • popup will hinder --nocapture, even thought you pass it to :RustLsp testables
• nextest is used by rustaceanvim by default, set enable_nextest = false if back to cargo test.
• lua annotation like ---@type _.lspconfig.settings.rust_analyzer.Hover helps you write nested tables.

  {
    "mrcjkb/rustaceanvim",
    keys = {
      { "<F2>", "<cmd>RustLsp hover actions<cr>", ft = "rust", desc = "RustHoverActions" },
    },
    opts = {
      ---@type RustaceanToolsOpts
      tools = {
        test_executor = "termopen", -- default to a popup and hinder --nocapture arg
        -- enable_nextest = false, -- default is true
      },
      server = {
        default_settings = {
          ["rust-analyzer"] = {
            ---@type _.lspconfig.settings.rust_analyzer.Hover
            hover = {
              show = {
                structFields = 20,
              },
            },
          },
        },
      },
    },
  },