commit 8dac2acd6a79d571ff5409d9c90b4c9e73237eb4
author Bram Moolenaar <Bram@vim.org> Mon Dec 27 20:57:06 2021 +0000
committer Bram Moolenaar <Bram@vim.org> Mon Dec 27 20:57:06 2021 +0000
tree 1d3712aff207fc834fb5aa8dc5afc2a394fc7788
parent 4b28ba3245df8274303c79429972f9dc9438e4aa

patch 8.2.3916: no error for passing an invalid line number to append()

Problem:    No error for passing an invalid line number to append().
Solution:   In Vim9 script check for a non-negative number. (closes #9417)

src/evalbuffer.c

diff --git a/src/evalbuffer.c b/src/evalbuffer.c
index ba16436..50d26c4 100644
--- a/src/evalbuffer.c
+++ b/src/evalbuffer.c
@@ -151,6 +151,8 @@
     if (buf == NULL || (!is_curbuf && buf->b_ml.ml_mfp == NULL) || lnum < 1)
     {
 	rettv->vval.v_number = 1;	// FAIL
+	if (in_vim9script() && lnum < 1)
+	    semsg(_(e_invalid_line_number_nr), lnum_arg);
 	return;
     }