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use sort_unstable to sort primitive types It's not important to retain original order if we have &[1, 1, 2, 3] for example. clippy::stable_sort_primitive
The rustc_ast 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 dev guide: