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$ cargo run
Compiling enums v0.1.0 (file:///projects/enums)
error[E0004]: non-exhaustive patterns: `None` not covered
--> src/main.rs:3:15
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3 | match x {
| ^ pattern `None` not covered
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note: `Option<i32>` defined here
= note: the matched value is of type `Option<i32>`
help: ensure that all possible cases are being handled by adding a match arm with a wildcard pattern or an explicit pattern as shown
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4 ~ Some(i) => Some(i + 1),
5 ~ None => todo!(),
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For more information about this error, try `rustc --explain E0004`.
error: could not compile `enums` due to previous error
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