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Update architecture.md

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@ -75,7 +75,7 @@ Original [libsyntax parser](https://github.com/rust-lang/rust/blob/6b99adeb11313
**Architecture Invariant:** the parser is independent of the particular tree structure and particular representation of the tokens. **Architecture Invariant:** the parser is independent of the particular tree structure and particular representation of the tokens.
It transforms one flat stream of events into another flat stream of events. It transforms one flat stream of events into another flat stream of events.
Token independence allows us to pares out both text-based source code and `tt`-based macro input. Token independence allows us to parse out both text-based source code and `tt`-based macro input.
Tree independence allows us to more easily vary the syntax tree implementation. Tree independence allows us to more easily vary the syntax tree implementation.
It should also unlock efficient light-parsing approaches. It should also unlock efficient light-parsing approaches.
For example, you can extract the set of names defined in a file (for typo correction) without building a syntax tree. For example, you can extract the set of names defined in a file (for typo correction) without building a syntax tree.