[arc619]

Nim uses stack allocated value types by default, and GC (or ptr) is an optional tag to the type definition.

GC types use borrow & move analysis like rust (not as good yet tho) so it can elide GC work when possible. GC is also not stop-the-world, deterministic (assuming no cycles), and configurable to soft realtime performance.

So you dont need to use the GC, but it will give you RAII if you want without needing to perform the dance of the borrow checker.

BTW Nim is also closing in on Rust's borrow checking semantics, too!