Show error notification for rustup update failures (#121)

Author: alexheretic

lib/index.js

@@ -342,7 +342,13 @@ class RustLanguageClient extends AutoLanguageClient {
             .then(() => this._checkToolchain())
             .then(() => checkRls())
             .then(() => this._restartLanguageServers(`Updated Rls toolchain`))
-            .catch(logErr)
+            .catch(e => {
+              logErr(e)
+              e && atom.notifications.addError(`\`rustup update ${toolchain}\` failed`, {
+                detail: e,
+                dismissable: true,
+              })
+            })
 
           if (this.busySignalService) {
             this.busySignalService.reportBusyWhile(