As discussed in IRC recently with @Fishrock123 it would be nice if the deprecation messages contain a bit more info. Particulary I'd like to see

• filename:linenumber where it happens in userland code. I think this could be parsed off the stack through new Error().stack or similar, suggestions welcome.
• A prefix like (node) to identify where the messages come from.
• An flag like -print-all-deprecations to allow more than one print per deprecation to track down all places where it's happening.