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// run-pass
use std::io::Result;
struct Foo {}
pub trait FakeRead {
fn read_to_end(&mut self, buf: &mut Vec<u8>) -> Result<usize>;
}
impl FakeRead for Foo {
fn read_to_end(&mut self, _buf: &mut Vec<u8>) -> Result<usize> {
Ok(4)
}
}
fn main() {
let mut a = Foo {};
let mut v = Vec::new();
a.read_to_end(&mut v).unwrap();
}
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