539
???
(lemm.ee)
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mostly the
Result
type.MustGet
where you'd except a panicOrElse
to pass a fallback value (can be a function with return value of the same type, as the inner function, but without an error). Useful in e.g. more complex constructors where some fields might not be readily available.Either
can for instance be useful to have arbitrary type unions in structs. I haven't usedOption
that much but seems similar to Rust's.