{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"self.ctx.db.impl_self_ty(impl_id).substitute(Interner,"}]}
                        self.ctx.db.impl_self_ty(impl_id).substitute(Interner, &subst)
                        let subst = generics.placeholder_subst(self.ctx.db);
                    }