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The reader itself doesn't need ability to peek tokens, so it's better if clients implement this functionality. This hopefully becomes especially easy once we use iterator interface for lexer, but this is not too easy at the moment, because of buffered errors.
The syntax crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), parser, pretty-printer,
lexer, macro expander, and utilities for traversing ASTs.
For more information about how these things work in rustc, see the rustc guide: