Fix scanning of do-while statement. (#3149)

The newline before the while part is misinterpreted.

JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com

jerry-core/parser/js/js-scanner.c

@@ -1464,7 +1464,7 @@ scanner_scan_statement_end (parser_context_t *context_p, /**< context */
         parser_stack_pop_uint8 (context_p);
 
         if (type != LEXER_KEYW_WHILE
-            || (!terminator_found && (context_p->token.flags & LEXER_WAS_NEWLINE)))
+            || (!terminator_found && !(context_p->token.flags & LEXER_WAS_NEWLINE)))
         {
           scanner_raise_error (context_p);
         }

tests/jerry/do-while.js

@@ -0,0 +1,27 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var a = 0;
+
+do a++
+while (false)
+
+do { a++ } while (false)
+
+try {
+  eval("do a++ while (false)");
+  assert (false);
+} catch (e) {
+  assert (e instanceof SyntaxError);
+}