Fixed doctest to ignore on Windows

Cargo.toml

@@ -15,4 +15,7 @@ byteorder = "*"
 [target.'cfg(unix)'.dependencies]
 kvm-bindings = "0.1"
 
+[target.'cfg(unix)'.dev-dependencies]
+kvm-ioctls = "0.1.0"
+
 libc = ">=0.2.39"

src/x86_64/mod.rs

@@ -197,20 +197,19 @@ impl CpuId {
 
     /// Returns the mutable entries slice so they can be modified before passing to the VCPU.
     ///
-    // Example: 
-    //    NOTE: Example is KVM-specific and thus not going to run on all platforms
-    //    (and doc-comment examples do not yet support conditional compilation), so
-    //    the example is left as a regular comment.
-    //
-    // ```rust
-    // # extern crate kvm_ioctls;
-    // 
-    // use kvm_ioctls::Kvm;
-    // use vmm_vcpu::x86_64::{CpuId, MAX_CPUID_ENTRIES};
-    // let kvm = Kvm::new().unwrap();
-    // let mut cpuid = kvm.get_supported_cpuid(MAX_KVM_CPUID_ENTRIES).unwrap();
-    // let cpuid_entries = cpuid.mut_entries_slice();
-    // ```
+    /// ```cfg(unix)
+    /// extern crate kvm_ioctls;
+    /// 
+    /// use kvm_ioctls::Kvm;
+    /// use vmm_vcpu::x86_64::{CpuId, MAX_CPUID_ENTRIES};
+    /// 
+    /// # fn main() {
+    ///     let kvm = Kvm::new().unwrap();
+    ///     let mut cpuid = kvm.get_supported_cpuid(MAX_CPUID_ENTRIES).unwrap();
+    ///     let cpuid_entries = cpuid.mut_entries_slice();
+    /// # }
+    /// 
+    /// ```
     ///
     pub fn mut_entries_slice(&mut self) -> &mut [CpuIdEntry2] {
         // Mapping the unsized array to a slice is unsafe because the length isn't known.  Using