You could go: result.unwrap_or_else(|| todo !()) (unimplemented! is for missing functionality in a given version, todo! is for missing functionality durin

You could go: result.unwrap_or_else(|| todo !()) (unimplemented! is for missing functionality in a given version, todo! is for missing functionality during development) But using unwrap for these kinds of TODO is ok, code review won't let unjustified unwraps to pass