{"ast_node_type":"other","tokens":[{"end":94,"kind":"keyword","start":0,"text":"\"instantiating"}]}
            "instantiating type variable `{vid:?}` twice: new-value = {ty:?}, old-value={:?}",
            self.eq_relations().probe_value(vid).is_unknown(),
            self.eq_relations().probe_value(vid)