While quotemstr's reaction is over the top, I do see the need to have a memory allocation approach that can handle OOM gracefully. Many types of software that could benefit from Rust's compile-time safety will want to allocate right up to the limit of available memory, such as audio/video processing software where more memory equals more simultaneous effects and less I/O.
I am endlessly frustrated by poorly designed audio software that aborts without saving if an OOM occurs. At the very least, a process should have the oppprtunity to save its state to disk, or ideally continue operating at a reduced capacity (e.g. a video codec might use fewer reference frames) after freeing some resources.
