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bdfdbcd44d
Float 'incomplete_features' out to a const for visibility Float `let incomplete_features` out to a `const INCOMPLETE_FEATURES` and colocate near `active` features so that it is easier to find and edit. r? @oli-obk (use rollup)
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: