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The special case breaks several useful invariants (`ExpnId`s are globally unique, and never change). This special case was added back in 2016 in https://github.com/rust-lang/rust/pull/34355 |
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| src | ||
| Cargo.toml | ||
| README.md | ||
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: