What does the '-->' operator mean in C++ and why does it work?

Hi everyone! I'm learning C++ and came across some strange code on the internet. It was something like: ```cpp int x = 10; while (x --> 0) { printf("%d ", x); } ``` And this code works! It prints numbers from 9 to 0. At first I thought it was some new "arrow operator" that I missed in the textbook. But then I tried writing `x --> 0` without spaces as `x-->0` — it also works. But `x->0` doesn't — it gives a compilation error. I looked into the C++ documentation and couldn't find any mention of the `-->` operator. The C++ standard has operators `->` (member access via pointer), `--` (decrement), but no `-->`. How is this even possible? Is it some compiler trick or a standard feature? Why does the code with `while (x --> 0)` compile and work, even though such an operator doesn't exist?