let x = if let Ok(x) = foo { x} else { return Err(...)};みたいなのをlet Some(x) = foo else return Err(...);で書けるようになる
let x = if let Ok(x) = foo { x} else { return Err(...)};みたいなのをlet Some(x) = foo else return Err(...);で書けるようになる
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