auto merge of #13183 : erickt/rust/remove-list, r=alexcrichton

`collections::list::List` was decided in a [team meeting](https://github.com/mozilla/rust/wiki/Meeting-weekly-2014-03-25) that it was unnecessary, so this PR removes it. Additionally, it removes an old and redundant purity test and fixes some warnings.

3 files changed, 3 insertions, 3 deletions

diff --git a/src/libstd/iter.rs b/src/libstd/iter.rs
index 0a19bc43b28..f4a7e3c5769 100644
--- a/src/libstd/iter.rs
+++ b/src/libstd/iter.rs
@@ -2335,7 +2335,7 @@ mod tests {
 
     #[test]
     fn test_counter_from_iter() {
-        let mut it = count(0, 5).take(10);
+        let it = count(0, 5).take(10);
         let xs: ~[int] = FromIterator::from_iterator(it);
         assert_eq!(xs, ~[0, 5, 10, 15, 20, 25, 30, 35, 40, 45]);
     }
diff --git a/src/libstd/str.rs b/src/libstd/str.rs
index 0e640d3a662..5ef3e67c208 100644
--- a/src/libstd/str.rs
+++ b/src/libstd/str.rs
@@ -3218,7 +3218,7 @@ mod tests {
         let data = ~"ประเทศไทย中";
         let mut cpy = data.clone();
         let other = "abc";
-        let mut it = other.chars();
+        let it = other.chars();
         cpy.extend(it);
         assert_eq!(cpy, data + other);
     }
diff --git a/src/libstd/unstable/mutex.rs b/src/libstd/unstable/mutex.rs
index eda2df487aa..34023ceb452 100644
--- a/src/libstd/unstable/mutex.rs
+++ b/src/libstd/unstable/mutex.rs
@@ -621,7 +621,7 @@ mod test {
     #[test]
     fn destroy_immediately() {
         unsafe {
-            let mut m = StaticNativeMutex::new();
+            let m = StaticNativeMutex::new();
             m.destroy();
         }
     }