replace impls with `deriving` where applicable

3 files changed, 4 insertions, 39 deletions

diff --git a/src/libstd/bigint.rs b/src/libstd/bigint.rs
index 564afea9f08..7d20eb7b891 100644
--- a/src/libstd/bigint.rs
+++ b/src/libstd/bigint.rs
@@ -557,13 +557,9 @@ priv fn get_radix_base(radix: uint) -> (uint, uint) {
 }
 
 /// A Sign is a BigInt's composing element.
+#[deriving(Eq)]
 pub enum Sign { Minus, Zero, Plus }
 
-impl Eq for Sign {
-    fn eq(&self, other: &Sign) -> bool { self.cmp(other) == 0 }
-    fn ne(&self, other: &Sign) -> bool { self.cmp(other) != 0 }
-}
-
 impl Ord for Sign {
     fn lt(&self, other: &Sign) -> bool { self.cmp(other) <  0 }
     fn le(&self, other: &Sign) -> bool { self.cmp(other) <= 0 }
diff --git a/src/libstd/json.rs b/src/libstd/json.rs
index f1f736e01a1..a9b9b2977cd 100644
--- a/src/libstd/json.rs
+++ b/src/libstd/json.rs
@@ -35,6 +35,7 @@ pub enum Json {
 pub type List = ~[Json];
 pub type Object = LinearMap<~str, Json>;
 
+#[deriving(Eq)]
 pub struct Error {
     line: uint,
     col: uint,
@@ -1060,15 +1061,6 @@ impl Ord for Json {
     fn gt(&self, other: &Json) -> bool { (*other).lt(&(*self))  }
 }
 
-impl Eq for Error {
-    fn eq(&self, other: &Error) -> bool {
-        (*self).line == other.line &&
-        (*self).col == other.col &&
-        (*self).msg == other.msg
-    }
-    fn ne(&self, other: &Error) -> bool { !(*self).eq(other) }
-}
-
 trait ToJson { fn to_json(&self) -> Json; }
 
 impl ToJson for Json {
diff --git a/src/libstd/time.rs b/src/libstd/time.rs
index ce153c1ac24..9ac302ed890 100644
--- a/src/libstd/time.rs
+++ b/src/libstd/time.rs
@@ -40,6 +40,7 @@ pub mod rustrt {
 /// A record specifying a time value in seconds and nanoseconds.
 #[auto_encode]
 #[auto_decode]
+#[deriving(Eq)]
 pub struct Timespec { sec: i64, nsec: i32 }
 
 /*
@@ -57,13 +58,6 @@ pub impl Timespec {
     }
 }
 
-impl Eq for Timespec {
-    fn eq(&self, other: &Timespec) -> bool {
-        self.sec == other.sec && self.nsec == other.nsec
-    }
-    fn ne(&self, other: &Timespec) -> bool { !self.eq(other) }
-}
-
 impl Ord for Timespec {
     fn lt(&self, other: &Timespec) -> bool {
         self.sec < other.sec ||
@@ -117,6 +111,7 @@ pub fn tzset() {
 
 #[auto_encode]
 #[auto_decode]
+#[deriving(Eq)]
 pub struct Tm {
     tm_sec: i32, // seconds after the minute ~[0-60]
     tm_min: i32, // minutes after the hour ~[0-59]
@@ -132,24 +127,6 @@ pub struct Tm {
     tm_nsec: i32, // nanoseconds
 }
 
-impl Eq for Tm {
-    fn eq(&self, other: &Tm) -> bool {
-        self.tm_sec == (*other).tm_sec &&
-        self.tm_min == (*other).tm_min &&
-        self.tm_hour == (*other).tm_hour &&
-        self.tm_mday == (*other).tm_mday &&
-        self.tm_mon == (*other).tm_mon &&
-        self.tm_year == (*other).tm_year &&
-        self.tm_wday == (*other).tm_wday &&
-        self.tm_yday == (*other).tm_yday &&
-        self.tm_isdst == (*other).tm_isdst &&
-        self.tm_gmtoff == (*other).tm_gmtoff &&
-        self.tm_zone == (*other).tm_zone &&
-        self.tm_nsec == (*other).tm_nsec
-    }
-    fn ne(&self, other: &Tm) -> bool { !self.eq(other) }
-}
-
 pub fn empty_tm() -> Tm {
     Tm {
         tm_sec: 0_i32,