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Code shared from the Rust Playground
extern crate futures;
use futures::stream::Stream;
use futures::TryStreamExt;
use futures::{Sink, SinkExt};
// We take a <u64, u32> stream+sink and want to convert it to <u128, u64>
pub fn convert_sink_stream(
connection: impl Stream<Item = Result<u64, u32>> + Sink<u64, Error = u32>,
) -> impl Stream<Item = Result<u128, u64>> + Sink<u128, Error = u64>
.with(|x| {
let y = u128::from(x);
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