用于编写嵌套循环表达式的 Rust 宏

循环链用于编写嵌套循环表达式的 Rust 宏用法|示例|文档依赖关系[dependencies ]loop_chain =" 0.1.1"用法表达用fnmain () { loop_chain::loop_chain! {for widthin0 ..10 ;for heightin0 ..10 ; then {println! ("width: {}, height: {}" , width, height); } } }生成的代码如下：fnmain () {for widthin0 ..10 {for heightin0 ..10 {println! ("width: {}, height: {}" , width, height); } } }while 表达式fnmain () {letmut foo=0 ; loop_chain::loop_chain! {while foo<3 ; foo+=1 ;for xin0 ..10 ; then {println! ("