From efe63a5bbc5106164a08ee2eb415a7a701f5311f Mon Sep 17 00:00:00 2001
From: Robert Fancsik <robert.fancsik@h-lab.eu>
Date: Tue, 2 Nov 2021 08:36:16 +0100
Subject: [PATCH] Fix parsing unterminated let statement (#4808)

This patch fixes #4754

JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik robert.fancsik@h-lab.eu
---
 jerry-core/parser/js/js-parser-statm.c         |  6 +++++-
 tests/jerry/fail/regression-test-issue-4754.js | 15 +++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 tests/jerry/fail/regression-test-issue-4754.js

diff --git a/jerry-core/parser/js/js-parser-statm.c b/jerry-core/parser/js/js-parser-statm.c
index 7f8aa7596..46b403572 100644
--- a/jerry-core/parser/js/js-parser-statm.c
+++ b/jerry-core/parser/js/js-parser-statm.c
@@ -1550,6 +1550,10 @@ parser_parse_for_statement_start (parser_context_t *context_p) /**< context */
           break;
         }
 
+        /* FALLTHRU */
+      }
+      case LEXER_KEYW_LET:
+      {
         if (context_p->next_scanner_info_p->source_p == context_p->source_p
             && context_p->next_scanner_info_p->type != SCANNER_TYPE_BLOCK)
         {
@@ -1563,9 +1567,9 @@ parser_parse_for_statement_start (parser_context_t *context_p) /**< context */
         }
 
         context_p->token.type = LEXER_KEYW_LET;
+
         /* FALLTHRU */
       }
-      case LEXER_KEYW_LET:
       case LEXER_KEYW_CONST:
       {
         if (context_p->next_scanner_info_p->source_p == source_p)
diff --git a/tests/jerry/fail/regression-test-issue-4754.js b/tests/jerry/fail/regression-test-issue-4754.js
new file mode 100644
index 000000000..4f6b1d567
--- /dev/null
+++ b/tests/jerry/fail/regression-test-issue-4754.js
@@ -0,0 +1,15 @@
+// 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.
+
+class a { b() { for (let