[Webkit-unassigned] [Bug 247431] New: Ignored TypeError upon optional function call chain

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247431

            Bug ID: 247431
           Summary: Ignored TypeError upon optional function call chain
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: p51lee at kaist.ac.kr

// 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

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