{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"self.0.push(WitnessPat::wild_from_ctor(pcx.cx,"}]}
            self.0.push(WitnessPat::wild_from_ctor(pcx.cx, ctor.clone(), pcx.ty.clone()));
            // First add `Union { .. }` to `self`.
            fields