trpl-zh-cn/listings/ch06-enums-and-pattern-matching/no-listing-07-cant-use-option-directly/output.txt

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