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## Raw identifiers
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Rust因为版本更迭原因，可能会新增一些`关键字`,这些新增关键字可能会导致旧的函数名调用不再通过编译，例如在Rust Edition 2015中，引入了新的关键字`try`.
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运行以下代码:
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```rust
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extern crate foo;
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fn main() {
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foo::try();
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}
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```
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将获得下面的错误
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```rust
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error: expected identifier, found keyword `try`
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--> src/main.rs:4:4
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4 | foo::try();
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| ^^^ expected identifier, found keyword
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```
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可以用Raw identifier来解决:
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```rust
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extern crate foo;
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fn main() {
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foo::r#try();
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}
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```
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