Fix the sockopt_impl matcher rule order.

Rules for generic types were located above rules for specific types, so the
rules for specific types never got matched.  This caused the
sys::socket::sockopt::test::can_get_listen_on_tcp_socket test to fail on
FreeBSD.  The solution is to put all of the generic rules at the bottom.

src/sys/socket/sockopt.rs

@@ -49,10 +49,6 @@ macro_rules! getsockopt_impl {
 
 // Helper to generate the sockopt accessors
 macro_rules! sockopt_impl {
-    (GetOnly, $name:ident, $level:path, $flag:path, $ty:ty) => {
-        sockopt_impl!(GetOnly, $name, $level, $flag, $ty, GetStruct<$ty>);
-    };
-
     (GetOnly, $name:ident, $level:path, $flag:path, bool) => {
         sockopt_impl!(GetOnly, $name, $level, $flag, bool, GetBool);
     };
@@ -65,17 +61,6 @@ macro_rules! sockopt_impl {
         sockopt_impl!(GetOnly, $name, $level, $flag, usize, GetUsize);
     };
 
-    (GetOnly, $name:ident, $level:path, $flag:path, $ty:ty, $getter:ty) => {
-        #[derive(Copy, Clone, Debug)]
-        pub struct $name;
-
-        getsockopt_impl!($name, $level, $flag, $ty, $getter);
-    };
-
-    (SetOnly, $name:ident, $level:path, $flag:path, $ty:ty) => {
-        sockopt_impl!(SetOnly, $name, $level, $flag, $ty, SetStruct<$ty>);
-    };
-
     (SetOnly, $name:ident, $level:path, $flag:path, bool) => {
         sockopt_impl!(SetOnly, $name, $level, $flag, bool, SetBool);
     };
@@ -88,31 +73,50 @@ macro_rules! sockopt_impl {
         sockopt_impl!(SetOnly, $name, $level, $flag, usize, SetUsize);
     };
 
-    (SetOnly, $name:ident, $level:path, $flag:path, $ty:ty, $setter:ty) => {
-        #[derive(Copy, Clone, Debug)]
-        pub struct $name;
+    (Both, $name:ident, $level:path, $flag:path, bool) => {
+        sockopt_impl!(Both, $name, $level, $flag, bool, GetBool, SetBool);
+    };
 
-        setsockopt_impl!($name, $level, $flag, $ty, $setter);
+    (Both, $name:ident, $level:path, $flag:path, u8) => {
+        sockopt_impl!(Both, $name, $level, $flag, u8, GetU8, SetU8);
     };
 
-    (Both, $name:ident, $level:path, $flag:path, $ty:ty, $getter:ty, $setter:ty) => {
+    (Both, $name:ident, $level:path, $flag:path, usize) => {
+        sockopt_impl!(Both, $name, $level, $flag, usize, GetUsize, SetUsize);
+    };
+
+    /*
+     * Matchers with generic getter types must be placed at the end, so
+     * they'll only match _after_ specialized matchers fail
+     */
+    (GetOnly, $name:ident, $level:path, $flag:path, $ty:ty) => {
+        sockopt_impl!(GetOnly, $name, $level, $flag, $ty, GetStruct<$ty>);
+    };
+
+    (GetOnly, $name:ident, $level:path, $flag:path, $ty:ty, $getter:ty) => {
         #[derive(Copy, Clone, Debug)]
         pub struct $name;
 
-        setsockopt_impl!($name, $level, $flag, $ty, $setter);
         getsockopt_impl!($name, $level, $flag, $ty, $getter);
     };
 
-    (Both, $name:ident, $level:path, $flag:path, bool) => {
-        sockopt_impl!(Both, $name, $level, $flag, bool, GetBool, SetBool);
+    (SetOnly, $name:ident, $level:path, $flag:path, $ty:ty) => {
+        sockopt_impl!(SetOnly, $name, $level, $flag, $ty, SetStruct<$ty>);
     };
 
-    (Both, $name:ident, $level:path, $flag:path, u8) => {
-        sockopt_impl!(Both, $name, $level, $flag, u8, GetU8, SetU8);
+    (SetOnly, $name:ident, $level:path, $flag:path, $ty:ty, $setter:ty) => {
+        #[derive(Copy, Clone, Debug)]
+        pub struct $name;
+
+        setsockopt_impl!($name, $level, $flag, $ty, $setter);
     };
 
-    (Both, $name:ident, $level:path, $flag:path, usize) => {
-        sockopt_impl!(Both, $name, $level, $flag, usize, GetUsize, SetUsize);
+    (Both, $name:ident, $level:path, $flag:path, $ty:ty, $getter:ty, $setter:ty) => {
+        #[derive(Copy, Clone, Debug)]
+        pub struct $name;
+
+        setsockopt_impl!($name, $level, $flag, $ty, $setter);
+        getsockopt_impl!($name, $level, $flag, $ty, $getter);
     };
 
     (Both, $name:ident, $level:path, $flag:path, $ty:ty) => {