patch 8.1.1355: obvious mistakes are accepted as valid expressions commit https://github.com/vim/vim/commit/16e9b85113e0b354ece1cb4f5fcc7866850f3685 Author: Bram Moolenaar <Bram@vim.org> Date: Sun May 19 19:59:35 2019 +0200 patch 8.1.1355: obvious mistakes are accepted as valid expressions Problem: Obvious mistakes are accepted as valid expressions. Solution: Be more strict about parsing numbers. (Yasuhiro Matsumoto, closes #3981)

--- a/src/ops.c
+++ b/src/ops.c
@@ -5794,7 +5794,7 @@ do_addsub(
 		0 + (dobin ? STR2NR_BIN : 0)
 		    + (dooct ? STR2NR_OCT : 0)
 		    + (dohex ? STR2NR_HEX : 0),
-		NULL, &n, maxlen);
+		NULL, &n, maxlen, FALSE);
 
 	/* ignore leading '-' for hex and octal and bin numbers */
 	if (pre && negative)