Use vec![elt; n] where possible

The common pattern `iter::repeat(elt).take(n).collect::<Vec<_>>()` is
exactly equivalent to `vec![elt; n]`, do this replacement in the whole
tree.

(Actually, vec![] is smart enough to only call clone n - 1 times, while
the former solution would call clone n times, and this fact is
virtually irrelevant in practice.)

2 files changed, 4 insertions, 5 deletions

diff --git a/src/libstd/collections/hash/map.rs b/src/libstd/collections/hash/map.rs
index 1dca3b77f38..06a30670e8b 100644
--- a/src/libstd/collections/hash/map.rs
+++ b/src/libstd/collections/hash/map.rs
@@ -1638,7 +1638,7 @@ mod test_map {
 
     use super::HashMap;
     use super::Entry::{Occupied, Vacant};
-    use iter::{range_inclusive, repeat};
+    use iter::range_inclusive;
     use cell::RefCell;
     use rand::{thread_rng, Rng};
 
@@ -1698,7 +1698,7 @@ mod test_map {
     #[test]
     fn test_drops() {
         DROP_VECTOR.with(|slot| {
-            *slot.borrow_mut() = repeat(0).take(200).collect();
+            *slot.borrow_mut() = vec![0; 200];
         });
 
         {
@@ -1757,7 +1757,7 @@ mod test_map {
     #[test]
     fn test_move_iter_drops() {
         DROP_VECTOR.with(|v| {
-            *v.borrow_mut() = repeat(0).take(200).collect();
+            *v.borrow_mut() = vec![0; 200];
         });
 
         let hm = {
diff --git a/src/libstd/sys/windows/stdio.rs b/src/libstd/sys/windows/stdio.rs
index 9961fef714a..356787d5bf0 100644
--- a/src/libstd/sys/windows/stdio.rs
+++ b/src/libstd/sys/windows/stdio.rs
@@ -12,7 +12,6 @@ use prelude::v1::*;
 use io::prelude::*;
 
 use io::{self, Cursor};
-use iter::repeat;
 use libc;
 use ptr;
 use str;
@@ -94,7 +93,7 @@ impl Stdin {
         let mut utf8 = self.utf8.lock().unwrap();
         // Read more if the buffer is empty
         if utf8.position() as usize == utf8.get_ref().len() {
-            let mut utf16: Vec<u16> = repeat(0u16).take(0x1000).collect();
+            let mut utf16 = vec![0u16; 0x1000];
             let mut num = 0;
             try!(cvt(unsafe {
                 c::ReadConsoleW(handle,