add configuration option

editors/code/src/lang_client.ts

@@ -0,0 +1,16 @@
+import * as lc from "vscode-languageclient/node";
+import * as vscode from "vscode";
+
+export class RaLanguageClient extends lc.LanguageClient {
+    override error(message: string, data?: any, showNotification?: boolean | "force"): void {
+        // ignore `Request TYPE failed.` errors
+        const showError = vscode.workspace
+            .getConfiguration("rust-analyzer")
+            .get("showRequestFailedErrorNotification");
+        if (!showError && message.startsWith("Request") && message.endsWith("failed.")) {
+            return;
+        }
+
+        super.error(message, data, showNotification);
+    }
+}