diff --git a/src/libtest/lib.rs b/src/libtest/lib.rs
index 56af8785a76d47356d5035ca855cfb86c6eb32a8..5b04a1fed896c8f8a1470ec1d145e65133fab5e7 100644
--- a/src/libtest/lib.rs
+++ b/src/libtest/lib.rs
@@ -110,15 +110,13 @@ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
     }
 }
 
-#[deriving(Clone)]
+#[deriving(Clone, Copy)]
 enum NamePadding {
     PadNone,
     PadOnLeft,
     PadOnRight,
 }
 
-impl Copy for NamePadding {}
-
 impl TestDesc {
     fn padded_name(&self, column_count: uint, align: NamePadding) -> String {
         let mut name = String::from_str(self.name.as_slice());
@@ -215,14 +213,12 @@ pub struct TestDescAndFn {
     pub testfn: TestFn,
 }
 
-#[deriving(Clone, Encodable, Decodable, PartialEq, Show)]
+#[deriving(Clone, Copy, Encodable, Decodable, PartialEq, Show)]
 pub struct Metric {
     value: f64,
     noise: f64
 }
 
-impl Copy for Metric {}
-
 impl Metric {
     pub fn new(value: f64, noise: f64) -> Metric {
         Metric {value: value, noise: noise}
@@ -240,7 +236,7 @@ fn clone(&self) -> MetricMap {
 }
 
 /// Analysis of a single change in metric
-#[deriving(PartialEq, Show)]
+#[deriving(Copy, PartialEq, Show)]
 pub enum MetricChange {
     LikelyNoise,
     MetricAdded,
@@ -249,8 +245,6 @@ pub enum MetricChange {
     Regression(f64)
 }
 
-impl Copy for MetricChange {}
-
 pub type MetricDiff = BTreeMap<String,MetricChange>;
 
 // The default console test runner. It accepts the command line
@@ -287,14 +281,13 @@ pub fn test_main_static(args: &[String], tests: &[TestDescAndFn]) {
     test_main(args, owned_tests)
 }
 
+#[deriving(Copy)]
 pub enum ColorConfig {
     AutoColor,
     AlwaysColor,
     NeverColor,
 }
 
-impl Copy for ColorConfig {}
-
 pub struct TestOpts {
     pub filter: Option<Regex>,
     pub run_ignored: bool,