Turn on rust-analyzer's inferred-type hints

OPTIONS.md

@@ -2483,6 +2483,29 @@ false
 
 
 
+## kernels\.rust\.lsp\.rust-analyzer\.typeHints
+
+
+
+**Rust-analyzer: show inferred types inline**
+
+Draw the inferred type next to a ` let ` binding or a closure parameter\. rust-analyzer ships this off and expects the editor to ask for it, which is why it produces no hints by default\.
+
+
+
+*Type:*
+boolean
+
+
+
+*Default:*
+
+```nix
+true
+```
+
+
+
 ## kernels\.rust\.misc\.enableVariableInspector
 
 

modules/kernels/rust/language_server_rust_analyzer/config.nix

@@ -149,7 +149,7 @@ let
         "reborrowHints" = "never";
         "renderColons" = true;
         "typeHints" = {
-          "enable" = false;
+          "enable" = settings.typeHints;
           "hideClosureInitialization" = false;
           "hideNamedConstructor" = false;
         };

modules/kernels/rust/module.nix

@@ -73,6 +73,12 @@ in
         type = types.bool;
         default = true;
       };
+      lsp.rust-analyzer.typeHints = mkOption {
+        title = "Rust-analyzer: show inferred types inline";
+        description = "Draw the inferred type next to a `let` binding or a closure parameter. rust-analyzer ships this off and expects the editor to ask for it, which is why it produces no hints by default.";
+        type = types.bool;
+        default = true;
+      };
       lsp.rust-analyzer.debug = mkOption {
         title = "Rust-analyzer: debug output";
         type = types.bool;