remove extra::iter

This module provided adaptors for the old internal iterator protocol,
but they proved to be quite unreadable and are not generic enough to
handle borrowed pointers well.

Since Rust no longer defines an internal iteration protocol, I don't
think there's going to be any reuse via these adaptors.

Author: thestinger

doc/tutorial-tasks.md

@@ -544,7 +544,7 @@ an intermediate generation has already exited:
 ~~~
 # use std::task;
 # fn sleep_forever() { loop { task::yield() } }
-# fn wait_for_a_while() { do 1000.times { task::yield() } }
+# fn wait_for_a_while() { for _ in range(0, 1000u) { task::yield() } }
 # do task::try::<int> {
 do task::spawn_supervised {
     do task::spawn_supervised {
@@ -563,7 +563,7 @@ other at all, using `task::spawn_unlinked` for _isolated failure_.
 ~~~
 # use std::task;
 # fn random() -> uint { 100 }
-# fn sleep_for(i: uint) { do i.times { task::yield() } }
+# fn sleep_for(i: uint) { for _ in range(0, i) { task::yield() } }
 # do task::try::<()> {
 let (time1, time2) = (random(), random());
 do task::spawn_unlinked {

doc/tutorial.md

@@ -1894,7 +1894,7 @@ struct TimeBomb {
 
 impl Drop for TimeBomb {
     fn drop(&self) {
-        do self.explosivity.times {
+        for _ in range(0, self.explosivity) {
             println("blam!");
         }
     }

src/libextra/iter.rs

@@ -637,7 +637,7 @@ mod test {
         let doc = (page_pass::mk_pass(config::DocPerMod).f)(srv, doc);
         write_markdown(doc, writer_factory);
         // We expect two pages to have been written
-        do 2.times {
+        for _ in range(0, 2u) {
             po.recv();
         }
     }
@@ -649,7 +649,7 @@ mod test {
             ~"#[link(name = \"core\")]; mod a { }");
         let doc = (page_pass::mk_pass(config::DocPerMod).f)(srv, doc);
         write_markdown(doc, writer_factory);
-        do 2.times {
+        for _ in range(0, 2u) {
             let (page, markdown) = po.recv();
             match page {
                 doc::CratePage(_) => {

src/librustdoc/markdown_pass.rs

@@ -59,7 +59,7 @@ impl Results {
         {
             let mut set = f();
             do timed(&mut self.random_ints) {
-                do num_keys.times {
+                for _ in range(0, num_keys) {
                     set.insert((rng.next() as uint) % rand_cap);
                 }
             }
@@ -103,7 +103,7 @@ impl Results {
         {
             let mut set = f();
             do timed(&mut self.random_strings) {
-                do num_keys.times {
+                for _ in range(0, num_keys) {
                     let s = uint::to_str(rng.next() as uint);
                     set.insert(s);
                 }