And hence the "kinda" in async Rust. While boxed futures can be thought of as a segmented stack the literal callstack is not, which can still give you a stack overflow with a bunch of nested poll() calls.
Depends on what you specifically mean by "growable": when a goroutine runs out of stack space, a new one that's larger (iirc double sized) is created, the old one is copied into it, and then execution can resume.
