Beginner's problems navigating the nsc compiler's code in Intellij

Hi all, good day/night

recently I started looking at the compiler’s code to understand better some things about Scala and I’m having some troubles using IntelliJ with the code base. I read this guide and followed this readme here but I still cannot make intellij navigate to the definition of terms on files different from the one I’m in. This happens for instance in the nsc files. Is not the end of the world, but I was wondering if someone experienced the same or have some suggestion.
I’m on Mac OS Sierra and using Intellij 2017.2.6 and Java 1.8.0_152

Thanks a lot for the help

Did you get it straightened out? I think this probably fell between the cracks because it came in right before Christmas. Let us know if you still need help.