What you describe is the status quo for syntax extensions and macros. The standard way for a syntax extension (built into the Rust compiler, not a macro) to operate is to use the macro parser (which in turn uses the Rust parser) to turn token trees into AST nodes. See libsyntax/ext/ for implementations of existing syntax extensions.
If you want to write a macro, on the other hand, which is sufficient for most needs, then you don't need to do anything, because this is what macros already do -- as soon as they parse, say, `$s1:stmt`, `s1` is a statement AST node, ready for interpolation. Does this help? Paul
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