In https://bugzilla.mozilla.org/show_bug.cgi?id=1522244 we fixed preview for Map and Set, but things are still broken for WeakMap and WeakSet.

Depends on D27609

New test (well, the test from bug 1522244 that got backed out and never relanded, plus new weakmap/weakset logic).

https://hg.mozilla.org/mozilla-central/rev/5587eca8e117
https://hg.mozilla.org/mozilla-central/rev/e83e6a6b4b03
https://hg.mozilla.org/mozilla-central/rev/0ad12e8fb98c

There is a high frequency rate of devtools failures: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&searchStr=linux%2Cx64%2Cdebug%2Cmochitests%2Ctest-linux64%2Fdebug-mochitest-devtools-chrome-e10s-10%2Cm%28dt10%29 all of them with the following failure: devtools/client/debugger/test/mochitest/browser_dbg-worker-scopes.js | Uncaught exception - [object Object]

e.g.: https://treeherder.mozilla.org/logviewer.html#/jobs?job_id=243362666&repo=mozilla-central&lineNumber=20654

[task 2019-04-29T18:07:37.697Z] 18:07:37 INFO - Waiting for state change: selected source
[task 2019-04-29T18:07:37.698Z] 18:07:37 INFO - Finished waiting for state change: selected source
[task 2019-04-29T18:07:37.699Z] 18:07:37 INFO - Buffered messages finished
[task 2019-04-29T18:07:37.699Z] 18:07:37 INFO - TEST-UNEXPECTED-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-worker-scopes.js | Uncaught exception - [object Object]
[task 2019-04-29T18:07:37.700Z] 18:07:37 INFO - Leaving test bound
[task 2019-04-29T18:07:37.706Z] 18:07:37 INFO - Console message: [JavaScript Error: "remote browser crashed while on http://example.com/browser/devtools/client/debugger/test/mochitest/examples/doc-worker-scopes.html
[task 2019-04-29T18:07:37.707Z] 18:07:37 INFO - " {file: "chrome://mochikit/content/mochitest-e10s-utils.js" line: 8}]
[task 2019-04-29T18:07:37.707Z] 18:07:37 INFO - e10s_init/<@chrome://mochikit/content/mochitest-e10s-utils.js:8:8
[task 2019-04-29T18:07:37.708Z] 18:07:37 INFO - EventListener.handleEvente10s_init@chrome://mochikit/content/mochitest-e10s-utils.js:6:10
[task 2019-04-29T18:07:37.709Z] 18:07:37 INFO - testInit@chrome://mochikit/content/browser-test.js:105:5
[task 2019-04-29T18:07:37.709Z] 18:07:37 INFO - setTimeout handler@chrome://mochikit/content/browser-test.js:23:1
[task 2019-04-29T18:07:37.710Z] 18:07:37 INFO - loadChromeScripts@jar:file:///tmp/tmpQ59T5J.mozrunner/extensions/mochikit@mozilla.org.xpi!/api.js:13:25
[task 2019-04-29T18:07:37.710Z] 18:07:37 INFO - loadMochitest@jar:file:///tmp/tmpQ59T5J.mozrunner/extensions/mochikit@mozilla.org.xpi!/api.js:112:3
[task 2019-04-29T18:07:37.710Z] 18:07:37 INFO - @tests/mochitest/runtests.py:1780:5
[task 2019-04-29T18:07:37.711Z] 18:07:37 INFO - @tests/mochitest/runtests.py:1781:8
[task 2019-04-29T18:07:37.712Z] 18:07:37 INFO - evaluate.sandbox/promise<@chrome://marionette/content/evaluate.js:128:10
[task 2019-04-29T18:07:37.712Z] 18:07:37 INFO - evaluate.sandbox@chrome://marionette/content/evaluate.js:106:17
[task 2019-04-29T18:07:37.713Z] 18:07:37 INFO - GeckoDriver.prototype.execute_@chrome://marionette/content/driver.js:1029:28
[task 2019-04-29T18:07:37.713Z] 18:07:37 INFO - async*GeckoDriver.prototype.executeScript@chrome://marionette/content/driver.js:911:29
[task 2019-04-29T18:07:37.714Z] 18:07:37 INFO - despatch@chrome://marionette/content/server.js:289:40
[task 2019-04-29T18:07:37.714Z] 18:07:37 INFO - execute@chrome://marionette/content/server.js:262:16
[task 2019-04-29T18:07:37.716Z] 18:07:37 INFO - onPacket/<@chrome://marionette/content/server.js:235:20
[task 2019-04-29T18:07:37.716Z] 18:07:37 INFO - onPacket@chrome://marionette/content/server.js:236:9
[task 2019-04-29T18:07:37.717Z] 18:07:37 INFO - _onJSONObjectReady/<@chrome://marionette/content/transport.js:492:20
[task 2019-04-29T18:07:37.717Z] 18:07:37 INFO -
[task 2019-04-29T18:07:37.717Z] 18:07:37 INFO - GECKO(1068) | [ACTION] MAP_SCOPES [done] - {}
[task 2019-04-29T18:07:37.718Z] 18:07:37 INFO - GECKO(1068) | [ACTION] EVALUATE_EXPRESSIONS - {"type":"EVALUATE_EXPRESSIONS","cx":{"navigateCounter":0,"thread":"server1.conn95.child1/workerTarget23/context1","isPaused":true,"pauseCounter":1},"inputs":[],"results":[]}
[task 2019-04-29T18:07:37.719Z] 18:07:37 INFO - Removing tab.
[task 2019-04-29T18:07:37.719Z] 18:07:37 INFO - Waiting for event: 'TabClose' on [object XULElement].
[task 2019-04-29T18:07:37.719Z] 18:07:37 INFO - Got event: 'TabClose' on [object XULElement].
[task 2019-04-29T18:07:37.741Z] 18:07:37 INFO - Tab removed and finished closing
[task 2019-04-29T18:07:37.950Z] 18:07:37 INFO - TEST-FAIL | devtools/client/debugger/test/mochitest/browser_dbg-worker-scopes.js | Assertion count 1 is greater than expected range 0-0 assertions. -
[task 2019-04-29T18:07:37.950Z] 18:07:37 INFO - GECKO(1068) | MEMORY STAT | vsize 3515MB | residentFast 465MB | heapAllocated 137MB
[task 2019-04-29T18:07:37.951Z] 18:07:37 INFO - TEST-OK | devtools/client/debugger/test/mochitest/browser_dbg-worker-scopes.js | took 13175ms

It looks like it has started failing with this revision: https://hg.mozilla.org/mozilla-central/rev/0ad12e8fb98c2c20a249cdd9bed5e032a71c500f

:bhackett is there any chance you could take a look at this? Thank you.

(In reply to Natalia Csoregi [:nataliaCs] from comment #6)

There is a high frequency rate of devtools failures: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&searchStr=linux%2Cx64%2Cdebug%2Cmochitests%2Ctest-linux64%2Fdebug-mochitest-devtools-chrome-e10s-10%2Cm%28dt10%29 all of them with the following failure: devtools/client/debugger/test/mochitest/browser_dbg-worker-scopes.js | Uncaught exception - [object Object]

It looks like it has started failing with this revision: https://hg.mozilla.org/mozilla-central/rev/0ad12e8fb98c2c20a249cdd9bed5e032a71c500f

:bhackett is there any chance you could take a look at this? Thank you.

This looks like the same thing as bug 1456013. This new test seems to have exposed a problem in the browser and was just disabled on linux debug builds to reduce the failure rate.