Why is as_mut() not throwing error?

In the given image on Line 25, I was expected as_mut() to give error like cannot borrow node.next as mutable, as it is not declared as mutable.
I know my understanding is wrong but I'm not able to figure it out.

In order to call as_mut() all you need is an &mut reference. Since node is an &mut reference, you can borrow one of its fields. Note that node itself doesn't need to be declared mut in the if let because you are not replacing the &mut reference stored in node.


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