drop_some

• This crate defines DropSome trait and impl for Option.
• DropSome trait has .drop_some(self) -> Option<()> function.
• This is a syntax sugar for .map(|_|()).

Useful scene

```rust fn somefunction() -> Option<()> { match switcher { patterna => sometask1().dropsome()? patternb => sometask2().dropsome()? patternc => sometask3()? patternd => some_task4() _ => () } }

fn sometask1() -> Optiontask2<'a>() -> Option<&'a str> { /* abbr / } fn some_task3() -> Option<() > { / abbr / } fn some_task4() { / abbr */ } ```