misc: Fix beta clippy issues

Fixed with 'cargo clippy --fix' mostly.

Signed-off-by: Bo Chen <bchen@crusoe.ai>

src/main.rs

@@ -1094,8 +1094,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_memory() {
-        vec![
-            (
+        [(
                 vec!["cloud-hypervisor", "--kernel", "/path/to/kernel", "--memory", "size=1073741824"],
                 r#"{
                     "payload": {"kernel": "/path/to/kernel"},
@@ -1150,8 +1149,7 @@ mod unit_tests {
                     "memory": {"size": 1073741824, "hotplug_method": "VirtioMem", "hotplug_size": 1073741824}
                 }"#,
                 true,
-            ),
-        ]
+            )]
         .iter()
         .for_each(|(cli, openapi, equal)| {
             compare_vm_config_cli_vs_json(cli, openapi, *equal);
@@ -1302,7 +1300,7 @@ mod unit_tests {
 
     #[test]
     fn test_valid_vm_config_net() {
-        vec![
+        [
             // This test is expected to fail because the default MAC address is
             // randomly generated. There's no way we can have twice the same
             // default value.
@@ -1780,7 +1778,7 @@ mod unit_tests {
     #[test]
     #[cfg(target_arch = "x86_64")]
     fn test_valid_vm_config_devices() {
-        vec![
+        [
             (
                 vec![
                     "cloud-hypervisor",

test_infra/src/lib.rs

@@ -1229,18 +1229,14 @@ impl Guest {
     }
 }
 
+#[derive(Default)]
 pub enum VerbosityLevel {
+    #[default]
     Warn,
     Info,
     Debug,
 }
 
-impl Default for VerbosityLevel {
-    fn default() -> Self {
-        Self::Warn
-    }
-}
-
 impl Display for VerbosityLevel {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         use VerbosityLevel::*;

vm-migration/src/protocol.rs

@@ -50,8 +50,9 @@ use crate::MigratableError;
 // The source can at any time send an "abandon request" to cancel
 
 #[repr(u16)]
-#[derive(Copy, Clone)]
+#[derive(Copy, Clone, Default)]
 pub enum Command {
+    #[default]
     Invalid,
     Start,
     Config,
@@ -62,12 +63,6 @@ pub enum Command {
     MemoryFd,
 }
 
-impl Default for Command {
-    fn default() -> Self {
-        Self::Invalid
-    }
-}
-
 #[repr(C)]
 #[derive(Default, Copy, Clone)]
 pub struct Request {
@@ -139,19 +134,14 @@ impl Request {
 }
 
 #[repr(u16)]
-#[derive(Copy, Clone, PartialEq, Eq)]
+#[derive(Copy, Clone, PartialEq, Eq, Default)]
 pub enum Status {
+    #[default]
     Invalid,
     Ok,
     Error,
 }
 
-impl Default for Status {
-    fn default() -> Self {
-        Self::Invalid
-    }
-}
-
 #[repr(C)]
 #[derive(Default, Copy, Clone)]
 pub struct Response {