syntax_data: {"ast_node_type":"function","tokens":[{"end":50,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:             fn visit_ty(&mut self, ty: Ty<'tcx>) {
context_before:             // a really long time. See issue #83150 for why this is necessary.
context_after:                 let not_previously_inserted = self.type_collector.insert(ty);