syntax_data: {"ast_node_type":"other","tokens":[{"end":65,"kind":"keyword","start":0,"text":"ty::FnPtr(sig_tys,"}]}
source_snippet:             ty::FnPtr(sig_tys, _) => sig_tys.visit_with(visitor),
context_before:             ty::FnDef(_, args) => args.visit_with(visitor),
context_after:             ty::UnsafeBinder(f) => f.visit_with(visitor),