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to the heap is also the first block in this list,
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though it also contains the base node of the list. */
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ulint len; /*!< physical length of this block in bytes */
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ulint type; /*!< type of heap: MEM_HEAP_DYNAMIC, or
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MEM_HEAP_BUF possibly ORed to MEM_HEAP_BTR_SEARCH */
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ulint free; /*!< offset in bytes of the first free position for