Function allocate 

pub unsafe fn allocate<T>(allocator: &mut dyn Allocator) -> Option<NonNull<T>>

Performs a single heap allocation, like malloc. Uses the size and align of T for the memory layout.

Arguments

• allocator - Allocator trait implementation.

Safety

Unsafe because of a call to allocate_aligned, where the call is inherently unsafe because we aren’t certain the allocation will succeed.