1647169 - Optional call of eval (e.g. `eval?.(code)`) should be indirect eval

Status: VERIFIED FIXED

(Core :: JavaScript Engine, defect)

Description

[Toru Nagashima]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/83.0.4103.106 Safari/537.36

Steps to reproduce:

var a = "global";
(a => eval?.("console.log(a)"))("local");

Actual results:

Printed local in console.

Expected results:

Prints global in console.

The direct eval is only step 6.a.vi in 12.3.6.1 Runtime Semantics: Evaluation.
But optional chaining is 12.3.9.2 Runtime Semantics: ChainEvaluation.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.

Comment 2

[André Bargull [:anba]]

Attachment: Bug 1647169: Optional call can't be a direct eval. r=yulia!

Test case will be added through the next test262 sync:

• https://github.com/tc39/test262/pull/2667

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/583323d35563
Optional call can't be a direct eval. r=yulia

Comment 4

[Narcis Beleuzu [:NarcisB]]

https://hg.mozilla.org/mozilla-central/rev/583323d35563

Comment 5

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Reproduced the issue using Firefox 79.0a1 (20200621093846) on Ubuntu 18.04.
The issue is verified with Firefox 79.0b9 (20200717001501) on Windows 10x64, macOS 10.12 and Ubuntu 18.04. global string is presented in the console after using:

var a = "global";
(a => eval?.("console.log(a)"))("local");