Since there are no constructors or default values, a common pattern is to write factory functions that return pre-configured struct instances:
SHA512 (FreeBSD-14.4-RELEASE-arm64-aarch64.vmdk.xz) = bb9ed6bc20a212bc592f4d9d9fdca1f4d59d7bf7026f21666abdcf311e24e6d2820a6edab04ab15a28b1557904c20a1edf6315edb77e20c2bfb9424c52fafe7f
，更多细节参见PDF资料
fn mog_vm_new() - *mut u8;
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