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This is a cleaned up and separated version of the patches at https://lore.kernel.org/all/20240701145853.1394967-4-pbonzini@redhat.com/ https://lore.kernel.org/all/20240701145853.1394967-5-pbonzini@redhat.com/ Its first user will be the Error bindings; for example a QEMU Error ** can be converted to a Rust Option using unsafe { Option::<Error>::from_foreign(c_error) } Reviewed-by: Zhao Liu <zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>