Two simple modules are attached: f3 and f3lib. Change the filenames to f3.erl and f3lib.erl, and add them to an Erlang project. View the f3 module in Eclipse with Erlide. Place the cursor after the colon in line 8. Press F3, or menu-click and do "Open Declaration". This should cause the f3lib:b/4 function to come into focus. However, it is the f3lib:b/3 function that gets the focus.