1148759 - Printing a promise result of generator ceases the execution

Status: RESOLVED FIXED

(DevTools :: Console, defect)

Description

[Jakub Czerny]

Attachment: demo.js

First two block in attachment works ok. The last (third) block prints just

> "before"

but node.js (0.12 with --harmony flag) outputs

> before
> { value: {}, done: false }
> after
> { value: undefined, done: true }

as expected. I.e. line 

> console.log(result);

ceases the execution.

Comment 1

[Tooru Fujisawa [:arai]]

Following error is shown in browser console.

TypeError: this.objectActor.preview is undefined
>     let { ownProperties, safeGetterValues } = this.objectActor.preview;

Last good revision: 77b00f3cc7c7
First bad revision: 2add539cd09a
Pushlog: https://hg.mozilla.org/integration/mozilla-inbound/pushloghtml?fromchange=77b00f3cc7c7&tochange=2add539cd09a

maybe a regression from bug 1033153? it adds the code.
https://hg.mozilla.org/mozilla-central/rev/2548cc70c191

Comment 2

[Boris Zbarsky [:bzbarsky]]

Simpler testcase:

  console.log({ x: Promise.resolve() });

So basically the problem is in prettyprinting an object with a property value that's a Promise.

Comment 3

[Boris Zbarsky [:bzbarsky]]

Or even simpler, open the console and type:

   ({ x: Promise.resolve() })

Comment 4

[Loic]

Reg range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=8230834302c9&tochange=a255a234946e

Comment 5

[Nick Fitzgerald [:fitzgen] [⏰PST; UTC-8]]

Attachment: Ensure that we can inspect objects that reference a Promise

Comment 6

[Nick Fitzgerald [:fitzgen] [⏰PST; UTC-8]]

https://hg.mozilla.org/integration/fx-team/rev/f74e35a6a1e4

Comment 7

[Ryan VanderMeulen [:RyanVM]]

https://hg.mozilla.org/mozilla-central/rev/f74e35a6a1e4