syntax_data: {"ast_node_type":"function","tokens":[{"end":70,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn fold_const(&mut self, ct: ty::Const<'tcx>) -> ty::Const<'tcx> {
context_after:         if !ct.has_type_flags(ty::TypeFlags::HAS_TY_FREE_ALIAS) {