The problem is that self.messages.drain(..) takes a mutable borrow on self.messages. When you call self.process_message, the compiler assumes you might modify any field, including self.messages. It therefore reports an error. This is logical, but frustrating.
Linked lists are inherently iterative, with each node pointing to exactly one or zero additional nodes. The lack of branching within the data structure makes it trivial to fully explore it.
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