libregex: use #[deriving(Copy)]

src/libregex/parse.rs

@@ -77,14 +77,12 @@ pub enum Repeater {
     OneMore,
 }
 
-#[deriving(Show, Clone)]
+#[deriving(Copy, Show, Clone)]
 pub enum Greed {
     Greedy,
     Ungreedy,
 }
 
-impl Copy for Greed {}
-
 impl Greed {
     pub fn is_greedy(&self) -> bool {
         match *self {

src/libregex/re.rs

@@ -126,6 +126,7 @@ pub struct ExDynamic {
 }
 
 #[doc(hidden)]
+#[deriving(Copy)]
 pub struct ExNative {
     #[doc(hidden)]
     pub original: &'static str,
@@ -135,8 +136,6 @@ pub struct ExNative {
     pub prog: fn(MatchKind, &str, uint, uint) -> Vec<Option<uint>>
 }
 
-impl Copy for ExNative {}
-
 impl Clone for ExNative {
     fn clone(&self) -> ExNative {
         *self

src/libregex/vm.rs

@@ -50,6 +50,7 @@ use unicode::regex::PERLW;
 pub type CaptureLocs = Vec<Option<uint>>;
 
 /// Indicates the type of match to be performed by the VM.
+#[deriving(Copy)]
 pub enum MatchKind {
     /// Only checks if a match exists or not. Does not return location.
     Exists,
@@ -60,8 +61,6 @@ pub enum MatchKind {
     Submatches,
 }
 
-impl Copy for MatchKind {}
-
 /// Runs an NFA simulation on the compiled expression given on the search text
 /// `input`. The search begins at byte index `start` and ends at byte index
 /// `end`. (The range is specified here so that zero-width assertions will work
@@ -96,6 +95,7 @@ struct Nfa<'r, 't> {
 
 /// Indicates the next action to take after a single non-empty instruction
 /// is processed.
+#[deriving(Copy)]
 pub enum StepState {
     /// This is returned if and only if a Match instruction is reached and
     /// we only care about the existence of a match. It instructs the VM to
@@ -109,8 +109,6 @@ pub enum StepState {
     StepContinue,
 }
 
-impl Copy for StepState {}
-
 impl<'r, 't> Nfa<'r, 't> {
     fn run(&mut self) -> CaptureLocs {
         let ncaps = match self.which {