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At some point, I have been facing a weird behavior while debugging the swift code. When I handle a breakpoint, the variables in the debug area are empty.

For example:

debug

If I try to print self, for example, I'm getting the following message: 

Printing description of self:
self = <Unable to determine byte size.>

Overall it looks like I'm in the release mode, however I've double checked the configuration and seems it's ok:

  • Current scheme has a debug configuration.
  • Optimization level is None

Xcode 6.4

UPDATE: Debugging objc code in the same project works well.

UPDATE 2: I had migrated to Xcode 7 and swift 2.0 and the issue was fixed, but suddenly, I've got the same problem.

I've come across a discussion about a similar issue: https://twittercommunity.com/t/xcode-7-debugger/50792

Cœur
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tikhop
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  • @ILikeTau tried — same here. – tikhop Aug 24 '15 at 23:43
  • Looks like it might be an existing bug. This guy says he filed a bug report. http://stackoverflow.com/a/24979939/4475605 – Adrian Aug 25 '15 at 00:17
  • @AdrianB Yeah, I thought that it might be a bug, but if I compile and run another project it works well. – tikhop Aug 25 '15 at 00:38
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    Same issue from time to time – tomsoft Aug 25 '15 at 08:44
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    I'd say you've answered your own question. I suggest you should delete the update 2 from the question and give it as an answer! In a couple of days you can even accept your own answer and thus it will be Case Closed. :) – matt Sep 17 '15 at 02:28

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