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$ cargo run
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Compiling enums v0.1.0 (file:///projects/enums)
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error[E0277]: cannot add `Option<i8>` to `i8`
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--> src/main.rs:5:17
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5 | let sum = x + y;
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| ^ no implementation for `i8 + Option<i8>`
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= help: the trait `Add<Option<i8>>` is not implemented for `i8`
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= help: the following other types implement trait `Add<Rhs>`:
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`&'a i8` implements `Add<i8>`
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`&i8` implements `Add<&i8>`
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`i8` implements `Add<&i8>`
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`i8` implements `Add`
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For more information about this error, try `rustc --explain E0277`.
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error: could not compile `enums` (bin "enums") due to 1 previous error
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