Method erase

src/misc/alloc_tracker.cpp:118–125

    }

    void erase(void *key) {
        if (!entries || !live) return;
        size_t i = find(key);
        if (entries[i].key == key) {
            entries[i].key = kTombstone;
            --live;
        }
    }
};

// Placement-new into static storage: never destructed, so track_free during