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45088fdf68
Fix MutVisitor's default implementations to visit Stmt's and BinOp's spans The `Stmt` case is a bug introduced almost certainly unintentionally by https://github.com/rust-lang/rust/pull/126993. The code _used_ to visit and mutate `span` correctly, but got changed as follows by that PR. Notice how `span` is **copied** into the output by `|kind| Stmt { id, kind, span }` which happens after the mutation in the correct code (red) and before the mutation in the incorrect code (green). ```diff pub fn noop_flat_map_stmt<T: MutVisitor>( Stmt { kind, mut span, mut id }: Stmt, vis: &mut T, ) -> SmallVec<[Stmt; 1]> { vis.visit_id(&mut id); - vis.visit_span(&mut span); let stmts: SmallVec<_> = noop_flat_map_stmt_kind(kind, vis) .into_iter() .map(|kind| Stmt { id, kind, span }) .collect(); if stmts.len() > 1 { panic!(...); } + vis.visit_span(&mut span); stmts } ``` |
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| Cargo.toml | ||
| README.md | ||
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: