按官方处理发现异常

会报异常
error: failed to parse manifest at C:\Users\topma\RustroverProjects\untitled2\Cargo.toml

修改模式如下才能正常编译

网上说明
这样处理

https://course.rs/cargo/reference/features/intro.html
RUST 圣经里描述

[features]
print-a = []
print-b = []
full = ["print-a","print-b"]