[parser] early error when declaration Pattern missing Initializer

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index b54172f72c21cc6ccf320ed04877227804a5d134..12547f05d8decdd04f19d60d2a2763ec7752def4 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -2532,6 +2532,7 @@ void Parser::ParseVariableDeclarations(VariableDeclarationContext var_context,
 
     Expression* pattern;
     {
+      int decl_pos = peek_position();
       ExpressionClassifier pattern_classifier;
       Token::Value next = peek();
       pattern = ParsePrimaryExpression(&pattern_classifier, ok);
@@ -2547,6 +2548,20 @@ void Parser::ParseVariableDeclarations(VariableDeclarationContext var_context,
         *ok = false;
         return;
       }
+
+      is_for_iteration_variable =
+          var_context == kForStatement &&
+          (peek() == Token::IN || PeekContextualKeyword(CStrVector("of")));
+
+      if (!is_for_iteration_variable &&
+          (pattern->IsObjectLiteral() || pattern->IsArrayLiteral()) &&
+          peek() != Token::ASSIGN) {
+        ReportMessageAt(
+            Scanner::Location(decl_pos, scanner()->location().end_pos),
+            MessageTemplate::kInvalidDestructuringDeclaration);
+        *ok = false;
+        return;
+      }
     }
 
     Scanner::Location variable_loc = scanner()->location();