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Q8: use add_one, not use add-one crate #11

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@yangwenmai

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@yangwenmai

/office/rust/book/more-about-cargo/ch14-03-cargo-workspaces.html(link: https://doc.rust-lang.org/book/ch14-03-cargo-workspaces.html) 中提到:use add_one; 但是之前命名的是 add-one ,为什么引用的时候,是用下划线呢?

使用 use add-one 报错:

error: expected one of `::`, `;`, or `as`, found `-`
 --> adder/src/main.rs:1:8
  |
1 | use add-one;
  |        ^ expected one of `::`, `;`, or `as` here

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