style: Use `iter` for IntoIterator parameter names

This commit standardizes the codebase on `iter` for parameters with
IntoIterator bounds.

Previously about 40% of IntoIterator parameters were named `iterable`,
with most of the rest being named `iter`. There was a single place where
it was named `iterator`.

3 files changed, 10 insertions, 10 deletions

diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
index ed797a7ee08..7ab5c90b0ab 100644
--- a/src/libstd/collections/hash/map.rs
+++ b/src/libstd/collections/hash/map.rs
@@ -1580,11 +1580,11 @@ impl<'a, K: 'a, V: 'a> VacantEntry<'a, K, V> {
 impl<K, V, S> FromIterator<(K, V)> for HashMap<K, V, S>
     where K: Eq + Hash, S: BuildHasher + Default
 {
-    fn from_iter<T: IntoIterator<Item=(K, V)>>(iterable: T) -> HashMap<K, V, S> {
-        let iter = iterable.into_iter();
-        let lower = iter.size_hint().0;
+    fn from_iter<T: IntoIterator<Item=(K, V)>>(iter: T) -> HashMap<K, V, S> {
+        let iterator = iter.into_iter();
+        let lower = iterator.size_hint().0;
         let mut map = HashMap::with_capacity_and_hasher(lower, Default::default());
-        map.extend(iter);
+        map.extend(iterator);
         map
     }
 }
diff --git a/src/libstd/collections/hash/set.rs b/src/libstd/collections/hash/set.rs
index 84153955797..fdde1773a45 100644
--- a/src/libstd/collections/hash/set.rs
+++ b/src/libstd/collections/hash/set.rs
@@ -633,11 +633,11 @@ impl<T, S> FromIterator<T> for HashSet<T, S>
     where T: Eq + Hash,
           S: BuildHasher + Default,
 {
-    fn from_iter<I: IntoIterator<Item=T>>(iterable: I) -> HashSet<T, S> {
-        let iter = iterable.into_iter();
-        let lower = iter.size_hint().0;
+    fn from_iter<I: IntoIterator<Item=T>>(iter: I) -> HashSet<T, S> {
+        let iterator = iter.into_iter();
+        let lower = iterator.size_hint().0;
         let mut set = HashSet::with_capacity_and_hasher(lower, Default::default());
-        set.extend(iter);
+        set.extend(iterator);
         set
     }
 }
diff --git a/src/libstd/sys/common/wtf8.rs b/src/libstd/sys/common/wtf8.rs
index 8b79016c251..f64f835e198 100644
--- a/src/libstd/sys/common/wtf8.rs
+++ b/src/libstd/sys/common/wtf8.rs
@@ -356,8 +356,8 @@ impl FromIterator<CodePoint> for Wtf8Buf {
 /// This replaces surrogate code point pairs with supplementary code points,
 /// like concatenating ill-formed UTF-16 strings effectively would.
 impl Extend<CodePoint> for Wtf8Buf {
-    fn extend<T: IntoIterator<Item=CodePoint>>(&mut self, iterable: T) {
-        let iterator = iterable.into_iter();
+    fn extend<T: IntoIterator<Item=CodePoint>>(&mut self, iter: T) {
+        let iterator = iter.into_iter();
         let (low, _high) = iterator.size_hint();
         // Lower bound of one byte per code point (ASCII only)
         self.bytes.reserve(low);