syntax_data: {"ast_node_type":"other","tokens":[{"end":82,"kind":"keyword","start":0,"text":"types:"}]}
source_snippet:                 types: def.all_fields().map(|f| f.ty(self.tcx(), args)).collect(),
context_before:             ty::Adt(def, args) => ty::Binder::dummy(AutoImplConstituents {
context_after:                 assumptions: vec![],