zlacker

>>PaulHo+(OP)
The very useful TryFrom trait landed only in 1.34, so hopefully the code using unwrap_or_else() in From impl predates that...

Actually the From trait documentation is now extremely clear about when to implement it (https://doc.rust-lang.org/std/convert/trait.From.html#when-t...)

>>brohee+7n
As someone unfamiliar with Rust (yet! it's on my ever growing list of things I'd like to absorb into my brain), unwrap_or_else() sounds like part of the "What You See Is What I Threatened the Computer To Do" paradigm.

>>roland+Qq
There are also the equally threatening and useful `map_or_else` (on Result and Option) and `ok_or_else` (on Option and experimentally on bool)