std: Add a bunch of Default impls

src/libstd/unit.rs

@@ -45,6 +45,12 @@ impl TotalEq for () {
     fn equals(&self, _other: &()) -> bool { true }
 }
 
+#[cfg(not(test))]
+impl Default for () {
+    #[inline]
+    fn default() -> () { () }
+}
+
 #[cfg(not(test))]
 impl Zero for () {
     #[inline]
@@ -52,8 +58,3 @@ impl Zero for () {
     #[inline]
     fn is_zero(&self) -> bool { true }
 }
-
-#[cfg(not(test))]
-impl Default for () {
-    fn default() -> () { () }
-}