syntax_data: {"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"for"}]}
source_snippet:         for (local, &head) in ssa.copy_classes().iter_enumerated() {
context_before:         let mut storage_to_remove = DenseBitSet::new_empty(body.local_decls.len());
context_after:             if local != head {