From ad13549beb0bfb18e7205a789026dd127049fe99 Mon Sep 17 00:00:00 2001
From: Samuel Cobb <sjcobb2003@gmail.com>
Date: Fri, 5 Jun 2026 04:06:23 +0100
Subject: [PATCH] feat(rust): add assertion and comment on configuration

---
 configuration.nix                  |  3 ++-
 modules/plugins/languages/rust.nix | 12 +++++++-----
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/configuration.nix b/configuration.nix
index 3a29e8fe..8182b06e 100644
--- a/configuration.nix
+++ b/configuration.nix
@@ -74,7 +74,8 @@ isMaximal: {
       typst.enable = isMaximal;
       rust = {
         enable = isMaximal;
-        extensions.rustaceanvim.enable = isMaximal;
+        # Can only be enabled if lsp.enable = false
+        extensions.rustaceanvim.enable = false;
         extensions.crates-nvim.enable = isMaximal;
       };
       toml.enable = isMaximal;
diff --git a/modules/plugins/languages/rust.nix b/modules/plugins/languages/rust.nix
index e20d8629..136a01b6 100644
--- a/modules/plugins/languages/rust.nix
+++ b/modules/plugins/languages/rust.nix
@@ -282,11 +282,6 @@ in {
 
     (mkIf cfg.extensions.rustaceanvim.enable {
       vim = {
-        # TODO: Determine if mkForce is the best thing here, and if we should consider a warning instead? Or use priority settings.
-        lsp.servers.rust-analyzer.enable = lib.mkForce false;
-        lsp.servers.rust-analyzer.root_dir = lib.mkForce null; # let rustaceanvim determine root
-        lsp.servers.rust-analyzer.on_attach = lib.mkForce null; # let rustaceanvim determine attach funcs
-
         startPlugins = ["rustaceanvim"];
         pluginRC.rustaceanvim = entryAfter ["lsp-setup"] ''
           vim.g.rustaceanvim = function()
@@ -294,6 +289,13 @@ in {
           end
         '';
       };
+
+      assertions = [
+        {
+          assertion = !cfg.lsp.enable;
+          message = "rustaceanvim and vim.languages.rust.lsp.enable are mutually exclusive. Please ensure `vim.lsp.rust-analyzer.enable` is false, or disable `vim.languages.rust.lsp.enable`.";
+        }
+      ];
     })
 
     (mkIf cfg.extensions.crates-nvim.enable {