Translate examples/attribute/cfg/custom/input.md
Translate examples/attribute/cfg/custom/input.md

rust-lang-cn/rust-by-example-cn,aakloxu/rust-by-example-cn,jinyuanxie/rust-by-example-cn,jinyuanxie/rust-by-example-cn,aakloxu/rust-by-example-cn,rust-lang-cn/rust-by-example-cn