Add duplicated argument check for function rest parameter (#2740)

Also add a missing word from `PARSER_ERR_FORMAL_PARAM_AFTER_REST_PARAMETER` error message. JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
2019-01-31 14:15:42 +01:00
parent 1ff322b72f
commit ca8442c523
4 changed files with 16 additions and 5 deletions
@@ -2191,6 +2191,12 @@ parser_parse_function_arguments (parser_context_t *context_p, /**< context */
    else if (context_p->token.type == LEXER_THREE_DOTS)
    {
      lexer_expect_identifier (context_p, LEXER_IDENT_LITERAL);
+
+      if (context_p->literal_count == literal_count)
+      {
+        parser_raise_error (context_p, PARSER_ERR_DUPLICATED_ARGUMENT_NAMES);
+      }
+
      context_p->status_flags |= PARSER_FUNCTION_HAS_REST_PARAM;
    }
 #endif /* !CONFIG_DISABLE_ES2015_FUNCTION_REST_PARAMETER */