[nequo]

And in the functional world, Lean 4 achieves language level support for local mutation, early return, etc. in the same way, by converting it into non-mutating code:

https://dl.acm.org/doi/10.1145/3547640

[p_l]

In some ways, CPS as compilation target already went that way.

Sure, ultimately the code mutates values in place, but the specific actions are modeled as pure operations