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Code shared from the Rust Playground
use std::io::Write;
struct Foo<W: Write> {
out: W,
impl<W: Write> Foo<W> {
fn exchange_out<W2: Write>(self, new: W2) -> (Foo<W2>, W) {
let Foo { out } = self;
(Foo { out: new }, out )
fn main() {}
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