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// build-pass (FIXME(62277): could be check-pass?)
#![allow(dead_code)]
// pretty-expanded FIXME #23616
pub trait Writer {
fn write(&mut self, b: &[u8]) -> Result<(), ()>;
}
fn foo(a: &mut dyn Writer) {
a.write(&[]).unwrap();
}
pub fn main(){}
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