https://codspeed.io/uutils/coreutils/branches/oech3%3Anix-ctrlc?utm_source=github&utm_medium=comment-v2&utm_content=button&uri=src%2Fuu%2Frm%2Fbenches%2Frm_bench.rs%3A%3Arm_recursive_tree&runnerMode=Simulation&q=is%3Aimprovement+rm_+recursive_tree I don't know why, but I want to have it with system allocator.