1362428 - variables bound with let/const not shown in Scopes when step out of function

Status: RESOLVED DUPLICATE of bug 1432885

(DevTools :: Debugger, defect)

Description

[Daniel Lehmann]

Attachment: example.html

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:53.0) Gecko/20100101 Firefox/53.0
Build ID: 20170418123106

Steps to reproduce:

1. Open attached example.html in Firefox 53.0 or Firefox Developer Edition 54.0a2 (both affected, new and old debugger!).
2. Open Developer Tools, go to Debugger.
3. Set breakpoint in line 10 (first line in function).
4. Reload to hit breakpoint.
5. Click "step out".



Actual results:

- "Scopes" in debugger shows function scope with "someVar" variable, not a block scope with "someLet" and "someConst" variables.
- This seems inconsistent since execution after the "step out" pauses before leaving the function (and thus its scope): Why are let/const bound variables no longer visible, but var bound ones are?


Expected results:

- "Scopes" in debugger should also show block scope with "someLet" and "someConst" variables.
- This is also the behavior when setting a breakpoint at the closing brace and hitting that breakpoint (see screen capture video): "someLet", "someConst", and "someVar" are all visible as expected.

Comment 1

[Daniel Lehmann]

Attachment: Video capture of bug in Firefox Developer Edition 54.0a2

Comment 2

[Daniel Lehmann]

Possibly related: https://bugzilla.mozilla.org/show_bug.cgi?id=923975 ("Having to step out of a function twice so we can inspect its return value is confusing")

Comment 3

[Jason Laster [:jlast]]

Yes - i think that's related

I opened an issue on github: https://github.com/devtools-html/debugger.html/issues/3599