Just `mut` alongside `let mut`

I know how things stand currently with let mut.

I am talking about the future - an enhancement to make the code elegant.

Let me drill-down a bit ...

During the Lexing & Parsing step of the compiler, can the term set (which can be introduced in the future) get replaced by let mut?

FUTURE ==> Code will then be elegant with let and set <== FUTURE

FUTURE ==> Coders can then use these interchangeably - let mut and set <== FUTURE

Thanks,

Naga Vijayapuram