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https://github.com/KaiserY/trpl-zh-cn
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19 lines
838 B
Plaintext
19 lines
838 B
Plaintext
$ cargo run
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Compiling patterns v0.1.0 (file:///projects/patterns)
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error[E0005]: refutable pattern in local binding
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--> src/main.rs:3:9
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3 | let Some(x) = some_option_value;
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| ^^^^^^^ pattern `None` not covered
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= note: `let` bindings require an "irrefutable pattern", like a `struct` or an `enum` with only one variant
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= note: for more information, visit https://doc.rust-lang.org/book/ch19-02-refutability.html
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= note: the matched value is of type `Option<i32>`
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help: you might want to use `let else` to handle the variant that isn't matched
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3 | let Some(x) = some_option_value else { todo!() };
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| ++++++++++++++++
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For more information about this error, try `rustc --explain E0005`.
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error: could not compile `patterns` (bin "patterns") due to 1 previous error
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