{"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"self.inner.borrow_mut().type_variables().root_var(var)"}]}
        self.inner.borrow_mut().type_variables().root_var(var)
    pub fn root_var(&self, var: ty::TyVid) -> ty::TyVid {
    }