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// run-pass // pretty-expanded FIXME #23616 #![feature(box_syntax)] pub enum Thing { A(Box<dyn Foo+'static>) } pub trait Foo { fn dummy(&self) { } } pub struct Struct; impl Foo for Struct {} pub fn main() { match Thing::A(box Struct as Box<dyn Foo + 'static>) { Thing::A(_a) => 0, }; }