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9dd5340d3c
They're dodgy, covering all the keywords, including weak ones, and edition-specific ones without considering the edition. They have a single use in rustfmt. This commit changes that use to `is_reserved_ident`, which is a much more widely used alternative and is good enough, judging by the lack of effect on the test suite.
The rustc_ast crate contains those things concerned purely with syntax
– that is, the AST ("abstract syntax tree"), along with some definitions for tokens and token streams, data structures/traits for mutating ASTs, and shared definitions for other AST-related parts of the compiler (like the lexer and macro-expansion).
For more information about how these things work in rustc, see the rustc dev guide: