继this example: $ cargo build --verbose
Updating registry `https://github.com/rust-lang/crates.io-index`
failed to parse registry's information for: wayland-client
Caused by:
the given version req
锈书提到macros can be expanded与命令rustc --pretty expanded。我想,通过像 rustc -Z unstable-options --pretty expanded examples/macro_test.rs
macro_test.rs扩大一个例子文件的命令将有一些代码看起来像这样使用这个测试一些宏我在一个箱子中写道: #[macro_use] ex