diff --git a/src/libfmt_macros/lib.rs b/src/libfmt_macros/lib.rs
index 444806e78c1..3099bf559e4 100644
--- a/src/libfmt_macros/lib.rs
+++ b/src/libfmt_macros/lib.rs
@@ -35,7 +35,7 @@ use std::string;
 
 /// A piece is a portion of the format string which represents the next part
 /// to emit. These are emitted as a stream by the `Parser` class.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub enum Piece<'a> {
     /// A literal string which should directly be emitted
     String(&'a str),
@@ -44,10 +44,8 @@ pub enum Piece<'a> {
     NextArgument(Argument<'a>),
 }
 
-impl<'a> Copy for Piece<'a> {}
-
 /// Representation of an argument specification.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub struct Argument<'a> {
     /// Where to find this argument
     pub position: Position<'a>,
@@ -55,10 +53,8 @@ pub struct Argument<'a> {
     pub format: FormatSpec<'a>,
 }
 
-impl<'a> Copy for Argument<'a> {}
-
 /// Specification for the formatting of an argument in the format string.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub struct FormatSpec<'a> {
     /// Optionally specified character to fill alignment with
     pub fill: Option<char>,
@@ -76,10 +72,8 @@ pub struct FormatSpec<'a> {
     pub ty: &'a str
 }
 
-impl<'a> Copy for FormatSpec<'a> {}
-
 /// Enum describing where an argument for a format can be located.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub enum Position<'a> {
     /// The argument will be in the next position. This is the default.
     ArgumentNext,
@@ -89,10 +83,8 @@ pub enum Position<'a> {
     ArgumentNamed(&'a str),
 }
 
-impl<'a> Copy for Position<'a> {}
-
 /// Enum of alignments which are supported.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub enum Alignment {
     /// The value will be aligned to the left.
     AlignLeft,
@@ -104,11 +96,9 @@ pub enum Alignment {
     AlignUnknown,
 }
 
-impl Copy for Alignment {}
-
 /// Various flags which can be applied to format strings. The meaning of these
 /// flags is defined by the formatters themselves.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub enum Flag {
     /// A `+` will be used to denote positive numbers.
     FlagSignPlus,
@@ -122,11 +112,9 @@ pub enum Flag {
     FlagSignAwareZeroPad,
 }
 
-impl Copy for Flag {}
-
 /// A count is used for the precision and width parameters of an integer, and
 /// can reference either an argument or a literal integer.
-#[deriving(PartialEq)]
+#[deriving(Copy, PartialEq)]
 pub enum Count<'a> {
     /// The count is specified explicitly.
     CountIs(uint),
@@ -140,8 +128,6 @@ pub enum Count<'a> {
     CountImplied,
 }
 
-impl<'a> Copy for Count<'a> {}
-
 /// The parser structure for interpreting the input format string. This is
 /// modelled as an iterator over `Piece` structures to form a stream of tokens
 /// being output.