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error[E0072]: recursive type `Expr` has infinite size
--> $DIR/issue-32326.rs:5:1
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LL | enum Expr {
| ^^^^^^^^^
LL | Plus(Expr, Expr),
| ---- recursive without indirection
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help: insert some indirection (e.g., a `Box`, `Rc`, or `&`) to break the cycle
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LL | Plus(Box<Expr>, Expr),
| ++++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0072`.
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