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// check-pass
enum Sexpression {
Num(()),
Cons(&'static mut Sexpression)
}
fn causes_error_in_ast(mut l: &mut Sexpression) {
loop { match l {
&mut Sexpression::Num(ref mut n) => {},
&mut Sexpression::Cons(ref mut expr) => {
l = &mut **expr;
}
}}
}
fn main() {
causes_error_in_ast(&mut Sexpression::Num(()));
}
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