+ (unless (= (call-process-region (point-min) (point-max) notmuch-command
+ t t nil "count" "--batch") 0)
+ (notmuch-logged-error "notmuch count --batch failed"
+ "Please check that the notmuch CLI is new enough to support `count
+--batch'. In general we recommend running matching versions of
+the CLI and emacs interface."))
+