I forget transpiling js and py all the time...

Author: tyru

js/vimlparser.js

@@ -2703,7 +2703,7 @@ ExprTokenizer.prototype.get_dict_literal_key = function() {
     var r = this.reader;
     var c = r.peek();
     if (!isalnum(c) && c != "_" && c != "-") {
-        throw Err(viml_printf("unexpected token: %s", token.value), token.pos);
+        throw Err(viml_printf("unexpected character: %s", c), this.reader.getpos());
     }
     var s = c;
     this.reader.seek_cur(1);

py/vimlparser.py

@@ -2135,7 +2135,7 @@ def get_dict_literal_key(self):
         r = self.reader
         c = r.peek()
         if not isalnum(c) and c != "_" and c != "-":
-            raise VimLParserException(Err(viml_printf("unexpected token: %s", token.value), token.pos))
+            raise VimLParserException(Err(viml_printf("unexpected character: %s", c), self.reader.getpos()))
         s = c
         self.reader.seek_cur(1)
         while TRUE: