expand on Result, Option, Iterator #185
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* Result::{expect, unwrap, map, and_then}
* Option::{expect, unwrap, map, and_then}
* Iterator::{sum, product, fold}
* Tests
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Thanks! Interesting approach inspecting the first value in the iterator. Not sure that's where we want to end up, but it's certainly better than type-bespoke functions (e.g. |
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Some missing ones I found useful!