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// run-pass struct Foo { x: u32 } impl Foo { fn twiddle(&mut self) -> &mut Self { self } fn twaddle(&mut self) -> &mut Self { self } fn emit(&mut self) { self.x += 1; } } fn main() { let mut foo = Foo { x: 0 }; match 22 { 22 => &mut foo, 44 => foo.twiddle(), _ => foo.twaddle(), }.emit(); }