commit 8ccbbeb620dcc73154de29c51100fe815cefe109
author Bram Moolenaar <Bram@vim.org> Wed Mar 02 19:49:38 2022 +0000
committer Bram Moolenaar <Bram@vim.org> Wed Mar 02 19:49:38 2022 +0000
tree 2da5c4d7ade1cbfafe3d14d73050ad387b1b379c
parent 7f687aaca9f2fd7c04f8a07effed92dd0164f6a2

patch 8.2.4492: no error if an option is given a value with ":let &opt = val"

Problem:    No error if an option is given an invalid value with
            ":let &opt = val".
Solution:   Give the error. (closes #9864)

src/testdir/test_options.vim

diff --git a/src/testdir/test_options.vim b/src/testdir/test_options.vim
index 9ba2ce4..81081f5 100644
--- a/src/testdir/test_options.vim
+++ b/src/testdir/test_options.vim
@@ -369,6 +369,7 @@
   call assert_fails('set sidescroll=-1', 'E487:')
   call assert_fails('set tabstop=-1', 'E487:')
   call assert_fails('set tabstop=10000', 'E474:')
+  call assert_fails('let &tabstop = 10000', 'E474:')
   call assert_fails('set tabstop=5500000000', 'E474:')
   call assert_fails('set textwidth=-1', 'E487:')
   call assert_fails('set timeoutlen=-1', 'E487:')
@@ -384,6 +385,7 @@
   call assert_fails('set comments=a', 'E525:')
   call assert_fails('set foldmarker=x', 'E536:')
   call assert_fails('set commentstring=x', 'E537:')
+  call assert_fails('let &commentstring = "x"', 'E537:')
   call assert_fails('set complete=x', 'E539:')
   call assert_fails('set rulerformat=%-', 'E539:')
   call assert_fails('set rulerformat=%(', 'E542:')