Message string improvements

src/bin/pg_basebackup/pg_receivexlog.c

@@ -479,17 +479,19 @@ main(int argc, char **argv)
 		exit(1);
 	}
 
-	if (replication_slot == NULL && (do_drop_slot || do_create_slot))
+	if (do_drop_slot && do_create_slot)
 	{
-		fprintf(stderr, _("%s: --create-slot and --drop-slot need a slot to be specified using --slot\n"), progname);
+		fprintf(stderr, _("%s: cannot use --create-slot together with --drop-slot\n"), progname);
 		fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
 				progname);
 		exit(1);
 	}
 
-	if (do_drop_slot && do_create_slot)
+	if (replication_slot == NULL && (do_drop_slot || do_create_slot))
 	{
-		fprintf(stderr, _("%s: cannot use --create-slot together with --drop-slot\n"), progname);
+		/* translator: second %s is an option name */
+		fprintf(stderr, _("%s: %s needs a slot to be specified using --slot\n"), progname,
+				do_drop_slot ? "--drop-slot" : "--create-slot");
 		fprintf(stderr, _("Try \"%s --help\" for more information.\n"),
 				progname);
 		exit(1);

src/bin/pg_basebackup/pg_recvlogical.c

@@ -852,7 +852,7 @@ main(int argc, char **argv)
 	if (db_name == NULL)
 	{
 		fprintf(stderr,
-				_("%s: failed to establish database specific replication connection\n"),
+				_("%s: could not establish database-specific replication connection\n"),
 				progname);
 		disconnect_and_exit(1);
 	}