{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"self.node_ty_opt(expr.hir_id).unwrap_or_else(||"}]}
                        self.node_ty_opt(expr.hir_id).unwrap_or_else(|| self.next_ty_var(expr.span))
                    .map(|expr| {
                    })