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7a7fcad675
cleanup StringReader fields reduce visibility and replace `Lrc<SourceFile>` with `start_pos`: the single bit we actually *need* from the file. r? @petrochenkov
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: