commit 61343f0c44c8e71df04918d033e0a744c0b7f8aa
author Bram Moolenaar <Bram@vim.org> Sat Jul 20 21:11:13 2019 +0200
committer Bram Moolenaar <Bram@vim.org> Sat Jul 20 21:11:13 2019 +0200
tree 50a786d74aa00d2f93d352c2f4db94a026620370
parent 63187f79327e30cdce7c89d35121b79452d80cc3

patch 8.1.1722: error when scriptversion is 2 a making a dictionary access

Problem:    Error when scriptversion is 2 a making a dictionary access.
Solution:   Parse the subscript even when not evaluating the sub-expression.
            (closes #4704)

src/eval.c

diff --git a/src/eval.c b/src/eval.c
index 8e9d013..d633f45 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -1486,7 +1486,7 @@
 /*
  * Assign the typevalue "tv" to the variable or variables at "arg_start".
  * Handles both "var" with any type and "[var, var; var]" with a list type.
- * When "nextchars" is not NULL it points to a string with characters that
+ * When "op" is not NULL it points to a string with characters that
  * must appear after the variable(s).  Use "+", "-" or "." for add, subtract
  * or concatenate.
  * Returns OK or FAIL;
@@ -1499,7 +1499,7 @@
     int		semicolon,	// from skip_var_list()
     int		var_count,	// from skip_var_list()
     int		is_const,	// lock variables for const
-    char_u	*nextchars)
+    char_u	*op)
 {
     char_u	*arg = arg_start;
     list_T	*l;
@@ -1512,7 +1512,7 @@
 	/*
 	 * ":let var = expr" or ":for var in list"
 	 */
-	if (ex_let_one(arg, tv, copy, is_const, nextchars, nextchars) == NULL)
+	if (ex_let_one(arg, tv, copy, is_const, op, op) == NULL)
 	    return FAIL;
 	return OK;
     }
@@ -1543,7 +1543,7 @@
     {
 	arg = skipwhite(arg + 1);
 	arg = ex_let_one(arg, &item->li_tv, TRUE, is_const,
-						   (char_u *)",;]", nextchars);
+							  (char_u *)",;]", op);
 	item = item->li_next;
 	if (arg == NULL)
 	    return FAIL;
@@ -1568,7 +1568,7 @@
 	    l->lv_refcount = 1;
 
 	    arg = ex_let_one(skipwhite(arg + 1), &ltv, FALSE, is_const,
-						     (char_u *)"]", nextchars);
+							    (char_u *)"]", op);
 	    clear_tv(&ltv);
 	    if (arg == NULL)
 		return FAIL;
@@ -7355,9 +7355,14 @@
     int		len;
     typval_T	functv;
 
+    // "." is ".name" lookup when we found a dict or when evaluating and
+    // scriptversion is at least 2, where string concatenation is "..".
     while (ret == OK
 	    && (**arg == '['
-		|| (**arg == '.' && rettv->v_type == VAR_DICT)
+		|| (**arg == '.' && (rettv->v_type == VAR_DICT
+			|| (!evaluate
+			    && (*arg)[1] != '.'
+			    && current_sctx.sc_version >= 2)))
 		|| (**arg == '(' && (!evaluate || rettv->v_type == VAR_FUNC
 					    || rettv->v_type == VAR_PARTIAL)))
 	    && !VIM_ISWHITE(*(*arg - 1)))