arg: update code to work with current Rust

examples/staging/arg/args.rs

@@ -3,7 +3,7 @@ use std::os;
 fn main() {
     let args = os::args();
     // The first argument is the path that was used to call the program.
-    println!("My path is {}.", args.get(0));
+    println!("My path is {}.", args[0]);
     // The rest of the arguments are the passed command line parameters.
     // Call the program like this:
     // $ ./args arg1 arg2

examples/staging/arg/getopts/echo.rs

@@ -8,7 +8,7 @@ static VERSION: &'static str = "1.0.0";
 
 fn main() {
     let args = os::args();
-    let program = args.get(0).as_slice();
+    let ref program = args[0];
 
     // Set possible flags.
     // The first argument to `optflag` is the short flag name.
@@ -20,7 +20,7 @@ fn main() {
         getopts::optflag("V", "version", "output version information and exit"),
     ];
 
-    let matches = match getopts::getopts(args.tail(), opts) {
+    let matches = match getopts::getopts(args.tail(), &opts) {
         Ok(m) => m,
         Err(f) => {
             println!("{}", f);
@@ -39,7 +39,7 @@ fn main() {
         println!(" {} [SHORT-OPTION]... [STRING]...", program);
         println!(" {} LONG-OPTION", program);
         println!("");
-        println(getopts::usage("Echo the STRING(s) to standard output.", opts)
+        println(getopts::usage("Echo the STRING(s) to standard output.", &opts)
                 .as_slice());
         return;
     }
@@ -53,7 +53,7 @@ fn main() {
         //^ `matches.free` contains all the arguments that are not options.
         let string = matches.free.connect(" ");
         print(string.as_slice());
-    } 
+    }
 
     if !matches.opt_present("n") {
         println!("")

examples/staging/arg/getopts/testopt.rs

@@ -13,7 +13,7 @@ fn main() {
         //  Use `optmulti`, `optflagmulti` if options can occur multiple times.
     ];
 
-    let matches = match getopts::getopts(args.tail(), opts) {
+    let matches = match getopts::getopts(args.tail(), &opts) {
         Ok(m) => m,
         Err(f) => {
             println!("{}", f);
@@ -29,7 +29,7 @@ fn main() {
     };
     //^ Use `matches.opt_default` if you need a default (`opflagopt`).
     //  Use `matches.opt_count` if you need to count how many were matched (`*multi`).
-    
+
     println!("a={}, b={}, c=\"{}\"", a, b, c);
     if !matches.free.is_empty() {
         println!("free arguments: {}", matches.free);