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This feature is called Codelens. It can be enabled or disabled in Visual Studio settings (Tools -> Options).
Note that this feature is only available on Visual Studio Enterprise or Professional. This is one of the few things Community doesn’t have in relation to Professional.
Could be there was some extension that did this and it might have been disabled for some reason.
Still it is possible to find where it was used with Shift + F12.
The Resharper can help even more.
Visual Studio Community 2015 Usage
– Pablo Ferreira
So it’s not gone, it’s never been there.
– Maniero
Man I asked the question precisely because it disappeared, I’m calling this Sub and this Function and does not appear the reference as said above.
– Pablo Ferreira
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– Maniero