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// run-pass // pretty-expanded FIXME #23616 #![feature(box_syntax)] struct Element; macro_rules! foo { ($tag: expr, $string: expr) => { if $tag == $string { let element: Box<_> = box Element; unsafe { return std::mem::transmute::<_, usize>(element); } } } } fn bar() -> usize { foo!("a", "b"); 0 } fn main() { bar(); }