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$ cargo run
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Compiling enums v0.1.0 (file:///projects/enums)
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error[E0004]: non-exhaustive patterns: `None` not covered
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--> src/main.rs:3:15
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3 | match x {
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| ^ pattern `None` not covered
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note: `Option<i32>` defined here
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--> /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/option.rs:574:1
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::: /rustc/eeb90cda1969383f56a2637cbd3037bdf598841c/library/core/src/option.rs:578:5
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= note: not covered
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= note: the matched value is of type `Option<i32>`
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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),
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5 ~ None => todo!(),
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For more information about this error, try `rustc --explain E0004`.
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error: could not compile `enums` (bin "enums") due to 1 previous error
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