Comment by eru

No. There's no mutation happening.

Of course, a compiler might do whatever shenanigans it has to do. But that's an implementation detail and doesn't change how the language works.

(And let's not pretend that CPUs execute something that resembles an imperative language like C under the hood. That might have been true during the PDP11 or a VAX days. These days with out-of-order execution, pipelining etc what's actually happening doesn't really resemble one-after-another imperative code much.)