When you say that Rust uses lots of allocations, are you referring to the heavy use of Vec<_>? My understanding is that almost everything that can be allocated

When you say that Rust uses lots of allocations, are you referring to the heavy use of Vec<_>? My understanding is that almost everything that can be allocated on the stack, is. Boxed types and trait objects are available, but they're opt-in features rather than the default.