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b54dd08a84
Move `#[do_not_recommend]` to the `#[diagnostic]` namespace This commit moves the `#[do_not_recommend]` attribute to the `#[diagnostic]` namespace. It still requires `#![feature(do_not_recommend)]` to work. r? `@compiler-errors`
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: