1 files changed, 66 insertions, 0 deletions
diff --git a/js/src/tests/test262/language/statements/for-in/dstr/obj-prop-elem-target-memberexpr-optchain-prop-ref-init.js b/js/src/tests/test262/language/statements/for-in/dstr/obj-prop-elem-target-memberexpr-optchain-prop-ref-init.js
new file mode 100644
index 0000000000..91c8913af4
--- /dev/null
+++ b/js/src/tests/test262/language/statements/for-in/dstr/obj-prop-elem-target-memberexpr-optchain-prop-ref-init.js
@@ -0,0 +1,66 @@
+// |reftest| error:SyntaxError
+// This file was procedurally generated from the following sources:
+// - src/dstr-assignment/obj-prop-elem-target-memberexpr-optchain-prop-ref-init.case
+// - src/dstr-assignment/syntax/for-in.template
+/*---
+description: It is a Syntax Error if LeftHandSideExpression of an DestructuringAssignmentTarget is neither an ObjectLiteral nor an ArrayLiteral and AssignmentTargetType(LeftHandSideExpression) is not simple Using Object (MemberExpression OptionalChain .IdentifierName Initializer) (For..in statement)
+esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
+features: [optional-chaining, destructuring-binding]
+flags: [generated]
+negative:
+  phase: parse
+  type: SyntaxError
+info: |
+    IterationStatement :
+      for ( LeftHandSideExpression of AssignmentExpression ) Statement
+
+    1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
+       AssignmentExpression, iterate).
+    2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
+       keyResult, assignment, labelSet).
+
+    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
+
+    [...]
+    4. If destructuring is true and if lhsKind is assignment, then
+       a. Assert: lhs is a LeftHandSideExpression.
+       b. Let assignmentPattern be the parse of the source text corresponding to
+          lhs using AssignmentPattern as the goal symbol.
+    [...]
+
+    Syntax
+
+    AssignmentElement : DestructuringAssignmentTarget Initializer_opt
+    DestructuringAssignmentTarget : LeftHandSideExpression
+
+    Static Semantics: Early Errors
+
+    OptionalExpression:
+      MemberExpression OptionalChain
+      CallExpression OptionalChain
+      OptionalExpression OptionalChain
+
+    OptionalChain:
+      ?. [ Expression ]
+      ?. IdentifierName
+      ?. Arguments 
+      ?. TemplateLiteral
+      OptionalChain [ Expression ]
+      OptionalChain .IdentifierName
+      OptionalChain Arguments 
+      OptionalChain TemplateLiteral
+
+    DestructuringAssignmentTarget : LeftHandSideExpression
+
+    - It is a Syntax Error if LeftHandSideExpression is neither an ObjectLiteral nor an ArrayLiteral and IsValidSimpleAssignmentTarget(LeftHandSideExpression) is not true.
+
+    Static Semantics: IsValidSimpleAssignmentTarget
+
+    LeftHandSideExpression : OptionalExpression
+      1. Return false.
+
+---*/
+$DONOTEVALUATE();
+var y = {};
+
+for ({ x: y?.z = 42 } in [{ x: 23 }]) ;