{"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"hir::FnRetTy::Return(self.arena.alloc(opaque_ty))"}]}
        hir::FnRetTy::Return(self.arena.alloc(opaque_ty))
        let opaque_ty = self.ty(opaque_ty_span, opaque_ty_ref);
    }