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Highlights
- Read-only AST visitors with default structural walkers, borrowed-node collection, subtree pruning, and hooks for every error-node category.
- Broader missing-operand recovery at contextual CASE and comprehension boundaries, preserving more useful structure for editor tooling.
Valid contextual-name clauses still take precedence. Recovery retains its four-insertion limit, shared retry budget, and original strict diagnostics.
See the 0.5 migration notes for examples and the changelog for details.