[jayjader]

I don't know of any programming language that does that as a language-first primitive. But this is basically slapping a `#pragma openmp parallel for` before your C for loop. In Rust there is the crate `rayon` that takes advantage of the language-level trait system to "augment" any (existing) iterable with a `par_iter()` method that effectively does what you describe: when included in the same module you can simply `for foo in bar.par_iter()` in place of `for foo in bar.iter()` to parallelize your iterations.

I suspect any language wanting to offer this as the default behavior for `for` loops will end up being a language like Java, Erlang, or SmallTalk - the language spec includes a "virtual" runtime that allows it to assume such flexibility in behavior, and capacity to "create/run threads/processes" that otherwise requires an OS (as in, you start leaving the perimeter of a programming language).