c2ec7532ee
completely deduplicate `Visitor` and `MutVisitor` r? oli-obk This closes rust-lang/rust#127615. ### Discussion > * Give every `MutVisitor::visit_*` method a corresponding `flat_map_*` method. Not every AST node exists in a location where they can be mapped to multiple instances of themselves. Not every AST node exists in a location where they can be removed from existence (e.g. `filter_map_expr`). I don't think this is doable. > * Give every `MutVisitor::visit_*` method a corresponding `Visitor` method and vice versa The only three remaining method-level asymmetries after this PR are `visit_stmt` and `visit_nested_use_tree` (only on `Visitor`) and `visit_span` (only on `MutVisitor`). `visit_stmt` doesn't seem applicable to `MutVisitor` because `walk_flat_map_stmt_kind` will ask `flat_map_item` / `filter_map_expr` to potentially turn a single `Stmt` to multiple based on what a visitor wants. So only using `flat_map_stmt` seems appropriate. `visit_nested_use_tree` is used for `rustc_resolve` to track stuff. Not useful for `MutVisitor` for now. `visit_span` is currently not used for `MutVisitor` already, it was just kept in case we want to revive rust-lang/rust#127241. cc `@cjgillot` maybe we could remove for now and re-insert later if we find a use-case? It does involve some extra effort to maintain. * Remaining FIXMEs `visit_lifetime` has an extra param for `Visitor` that's not in `MutVisitor`. This is again something only used by `rustc_resolve`. I think we can keep that symmetry for now. |
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