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patch 8.2.1502: Vim9: can use += with a :let command at script level

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Problem:    Vim9: can use += with a :let command at script level.
Solution:   Give an error.
This commit is contained in:
Bram Moolenaar
2020-08-21 21:32:50 +02:00
parent 3fc71285d5
commit 122616d9c1
4 changed files with 13 additions and 4 deletions
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8
src/evalvars.c
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@@ -786,7 +786,13 @@ ex_let(exarg_T *eap)
op[1] = NUL;
if (*expr != '=')
{
if (vim_strchr((char_u *)"+-*/%.", *expr) != NULL)
if (vim9script && (flags & LET_NO_COMMAND) == 0)
{
// +=, /=, etc. require an existing variable
semsg(_(e_cannot_use_operator_on_new_variable), eap->arg);
i = FAIL;
}
else if (vim_strchr((char_u *)"+-*/%.", *expr) != NULL)
{
op[0] = *expr; // +=, -=, *=, /=, %= or .=
++len;