graydon/rust — comment on commit 0b4f0a4caa6e765226c5f9d5609289dccb1072ce
File: doc/tutorial/data.md line 36
By brson:

It may be worth writing out the code for oldpoint here to make explicit what's happening. This explanation feels brief but I don't know if it's missing anything. FRU is something that gets asked about in IRC fairly often.