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vim-patch:8.0.1172: when E734 is given option is still set (#8988)

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Problem:    When E734 is given option is still set.
Solution:   Assign NULL to "s". (Christian Brabandt)
2a6a6c3014
This commit is contained in:
Jan Edmund Lazo 2018-09-13 01:52:31 -04:00 committed by Justin M. Keyes
parent d5702a4534
commit ea5337d9b5
2 changed files with 15 additions and 0 deletions
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1
src/nvim/eval.c
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@ -1912,6 +1912,7 @@ static char_u *ex_let_one(char_u *arg, typval_T *const tv,
if ((opt_type == 1 && *op == '.')
|| (opt_type == 0 && *op != '.')) {
EMSG2(_(e_letwrong), op);
s = NULL; // don't set the value
} else {
if (opt_type == 1) { // number
if (*op == '+') {

14
src/nvim/testdir/test_assign.vim
View File

@ -31,3 +31,17 @@ func Test_let_termcap()
let &t_xx = ""
call assert_fails('let x = &t_xx', 'E15')
endfunc
func Test_let_option_error()
let _w = &tw
let &tw = 80
call assert_fails('let &tw .= 1', 'E734')
call assert_equal(80, &tw)
let &tw = _w
let _w = &fillchars
let &fillchars = "vert:|"
call assert_fails('let &fillchars += "diff:-"', 'E734')
call assert_equal("vert:|", &fillchars)
let &fillchars = _w
endfunc