Reuse cmp in totally ordered types
Reuse cmp in totally ordered types

Instead of manually defining it, `partial_cmp` can simply wrap the
result of `cmp` for totally ordered types.

aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,graydon/rust,graydon/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust