cbebdd8e67
rustc_ast: Turn `MutVisitor::token_visiting_enabled` into a constant It's a visitor property rather than something that needs to be determined at runtime
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: