add configuration option

editors/code/package.json

@@ -502,6 +502,11 @@
                     "default": true,
                     "type": "boolean"
                 },
+                "rust-analyzer.showRequestFailedErrorNotification": {
+                    "markdownDescription": "Whether to show panic error notifications.",
+                    "default": true,
+                    "type": "boolean"
+                },
                 "rust-analyzer.showDependenciesExplorer": {
                     "markdownDescription": "Whether to show the dependencies view.",
                     "default": true,

editors/code/src/client.ts

@@ -10,7 +10,7 @@ import { type Config, prepareVSCodeConfig } from "./config";
 import { randomUUID } from "crypto";
 import { sep as pathSeparator } from "path";
 import { unwrapUndefinable } from "./undefinable";
-import { RaLanguageClient } from "./base_client";
+import { RaLanguageClient } from "./lang_client";
 
 export interface Env {
     [name: string]: string;

editors/code/src/lang_client.ts

@@ -1,9 +1,13 @@
 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
-        if (message.startsWith("Request") && message.endsWith("failed.")) {
+        const showError = vscode.workspace
+            .getConfiguration("rust-analyzer")
+            .get("showRequestFailedErrorNotification");
+        if (!showError && message.startsWith("Request") && message.endsWith("failed.")) {
             return;
         }