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diff src/evalvars.c @ 21905:2474c6b0c5de v8.2.1502

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patch 8.2.1502: Vim9: can use += with a :let command at script level Commit: https://github.com/vim/vim/commit/122616d9c1b57f1e1f29f1151f8e26d24df9092a Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 21 21:32:50 2020 +0200 patch 8.2.1502: Vim9: can use += with a :let command at script level Problem: Vim9: can use += with a :let command at script level. Solution: Give an error.
author Bram Moolenaar <Bram@vim.org>
date Fri, 21 Aug 2020 21:45:04 +0200
parents 172b1746489c
children a211bca98bc3
line wrap: on
line diff
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -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;