I'm using Xcode 8.3.3 on MacOS Sierra. I installed accidentally Xcode in ~/Downloads folder, not the Applications folder. I have been using it for a few weeks without any problems. Today, I couldn't comment a line of code. Neither using the shortcut key (command + /) nor opening Editor menu then select Cold Folder and Fold Comment Blocks worked.
I then reinstall Xcode in Applications folder and it worked.
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