std: Remove Option.or_{default,zero}

These can be replaced with `Some(option.or_default())`.

src/libstd/option.rs

@@ -467,15 +467,6 @@ pub fn unwrap_or_default(self) -> T {
             None => Default::default()
         }
     }
-
-    /// Returns self or `Some`-wrapped default value
-    #[inline]
-    pub fn or_default(self) -> Option<T> {
-        match self {
-            None => Some(Default::default()),
-            x => x,
-        }
-    }
 }
 
 impl<T> Default for Option<T> {
@@ -483,7 +474,7 @@ impl<T> Default for Option<T> {
     fn default() -> Option<T> { None }
 }
 
-impl<T:Zero> Option<T> {
+impl<T: Zero> Option<T> {
     /// Returns the contained value or zero (for this type)
     #[inline]
     pub fn unwrap_or_zero(self) -> T {
@@ -492,15 +483,6 @@ pub fn unwrap_or_zero(self) -> T {
             None => Zero::zero()
         }
     }
-
-    /// Returns self or `Some`-wrapped zero value
-    #[inline]
-    pub fn or_zero(self) -> Option<T> {
-        match self {
-            None => Some(Zero::zero()),
-            x => x
-        }
-    }
 }
 
 /// An iterator that yields either one or zero elements