https://doc.rust-lang.org/nightly/std/borrow/trait.BorrowMut.html
BorrowMut in std::borrow - Rust
A trait for mutably borrowing data.
stdborrowrust
https://paritytech.github.io/polkadot-sdk/master/sp_std/borrow/trait.BorrowMut.html
BorrowMut in sp_std::borrow - Rust
A trait for mutably borrowing data.
spstdborrowrust