Writing complex macros in Rust: Reverse Polish Notation

This post details the implementation of a Rust macro for evaluating Reverse Polish Notation (RPN) expressions at compile time. It explains the use of token trees (`tt`) for matching literals and operators, recursive macro invocation for state management (stack simulation), and the creation of infix expressions as intermediate steps. The post also touches upon the challenges of error handling and debugging macros using `trace_macros`.