libgetopts: use #[deriving(Copy)]

src/libgetopts/lib.rs

@@ -118,7 +118,7 @@ pub enum Name {
 }
 
 /// Describes whether an option has an argument.
-#[deriving(Clone, PartialEq, Eq)]
+#[deriving(Clone, Copy, PartialEq, Eq)]
 pub enum HasArg {
     /// The option requires an argument.
     Yes,
@@ -128,10 +128,8 @@ pub enum HasArg {
     Maybe,
 }
 
-impl Copy for HasArg {}
-
 /// Describes how often an option may occur.
-#[deriving(Clone, PartialEq, Eq)]
+#[deriving(Clone, Copy, PartialEq, Eq)]
 pub enum Occur {
     /// The option occurs once.
     Req,
@@ -141,8 +139,6 @@ pub enum Occur {
     Multi,
 }
 
-impl Copy for Occur {}
-
 /// A description of a possible option.
 #[deriving(Clone, PartialEq, Eq)]
 pub struct Opt {
@@ -211,7 +207,7 @@ pub enum Fail {
 }
 
 /// The type of failure that occurred.
-#[deriving(PartialEq, Eq)]
+#[deriving(Copy, PartialEq, Eq)]
 #[allow(missing_docs)]
 pub enum FailType {
     ArgumentMissing_,
@@ -221,8 +217,6 @@ pub enum FailType {
     UnexpectedArgument_,
 }
 
-impl Copy for FailType {}
-
 /// The result of parsing a command line with a set of options.
 pub type Result = result::Result<Matches, Fail>;
 
@@ -839,22 +833,22 @@ pub fn short_usage(program_name: &str, opts: &[OptGroup]) -> String {
     line
 }
 
+#[deriving(Copy)]
 enum SplitWithinState {
     A,  // leading whitespace, initial state
     B,  // words
     C,  // internal and trailing whitespace
 }
-impl Copy for SplitWithinState {}
+#[deriving(Copy)]
 enum Whitespace {
     Ws, // current char is whitespace
     Cr  // current char is not whitespace
 }
-impl Copy for Whitespace {}
+#[deriving(Copy)]
 enum LengthLimit {
     UnderLim, // current char makes current substring still fit in limit
     OverLim   // current char makes current substring no longer fit in limit
 }
-impl Copy for LengthLimit {}
 
 
 /// Splits a string into substrings with possibly internal whitespace,