Function bicoro::map_input

pub fn map_input<'a, InputA, InputB, Output, Result, MapFn>(
    co: Coroutine<'a, InputB, Output, Result>,
    map_fn: MapFn
) -> Coroutine<'a, InputA, Output, Result>where
    MapFn: Fn(InputA) -> InputB + Send + Clone + 'a,
    Result: Send,
    Output: Send,

Takes a coroutine that wants a, and ‘lifts’ or maps it into B

Note: This is somewhat backwards than you might expect map to be but is the closest you can get.