Bug 247431 – Ignored TypeError upon optional function call chain

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Kanguk Lee]

// input.js
var x = function ( ) { } ?. ( ) . x ;
__________________________________________

Hello,

Executing the input.js using JSC, it is terminated normally.
However, it is expected to throw TypeError since `function ( ) { } ?. ( )` is `undefined`.

Running the input.js with JSC results in:

---
$ jsc input.js
// no error
---

while other engines behave like:

---
# V8
$ node input.js
input.js:1: TypeError: Cannot read properties of undefined (reading 'x')
var x = function ( ) { } ?. ( ) . x ;
                                ^
TypeError: Cannot read properties of undefined (reading 'x')
    at input.js:1:33

# GraalJS
$ js input.js
TypeError: Cannot read property 'x' of undefined
	at <js> :program(input.js:1:8-34)
---


WebKit version: 615.1.10

[Radar WebKit Bug Importer]

<rdar://problem/101940388>

[Ross Kirsling]

*** Bug 247434 has been marked as a duplicate of this bug. ***

[Ross Kirsling]

Pull request: https://github.com/WebKit/WebKit/pull/6799

[EWS]

Committed 257004@main (23879e6bd1a0): <https://commits.webkit.org/257004@main>

Reviewed commits have been landed. Closing PR #6799 and removing active labels.