src/vs/workbench/contrib/tasks/browser/abstractTaskService.ts/AbstractTaskService/_showOutput
class AbstractTaskService:	protected _showOutput(runSource: TaskRunSource = TaskRunSource.User): void {
		if (!VirtualWorkspaceContext.getValue(this._contextKeyService) && ((runSource === TaskRunSource.User) || (runSource === TaskRunSource.ConfigurationChange))) {
			this._notificationService.prompt(Severity.Warning, nls.localize('taskServiceOutputPrompt', 'There are task errors. See the output for details.'),
				[{
					label: nls.localize('showOutput', "Show output"),
					run: () => {
						this._outputService.showChannel(this._outputChannel.id, true);
					}
				}]);
		}
	}