In Julia, a lot of the Base and closer related functions are also written in pure Julia, and the code is easily avaible. One can skim through the repository or the local dow
There is now another tool for this, https://github.com/timholy/CodeTracking.jl. It is part of Revise.jl (and works better when also using Revise). It should work inside Jupyter and with functions defined in the REPL, unlike @edit/@less.