From ac6ea8f1f6cd90502faee181dd054565802de4af Mon Sep 17 00:00:00 2001
From: Stefan Kreutz <mail@skreutz.com>
Date: Tue, 7 Feb 2023 18:01:47 +0100
Subject: Remove useless conversion from Range into Iterator

---
 src/lib.rs | 40 ++++++++++++++--------------------------
 1 file changed, 14 insertions(+), 26 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 2d34b1c..3114426 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,7 +10,6 @@
 //! use parseq::ParallelIterator;
 //!
 //! let mut iter = (0..3)
-//!   .into_iter()
 //!   .map_parallel(|i| {
 //!     // Insert heavy computation here ...
 //!     std::thread::sleep(Duration::from_millis((i % 3) * 10));
@@ -73,7 +72,6 @@ pub trait ParallelIterator {
     /// use parseq::ParallelIterator;
     ///
     /// let mut iter = (0..3)
-    ///   .into_iter()
     ///   .map_parallel(|i| {
     ///     std::thread::sleep(Duration::from_millis((i % 3) * 10));
     ///     i
@@ -121,7 +119,6 @@ pub trait ParallelIterator {
     /// use parseq::ParallelIterator;
     ///
     /// let mut iter = (0..3)
-    ///   .into_iter()
     ///   .map_parallel_limit(2, 16, |i| {
     ///     std::thread::sleep(Duration::from_millis((i % 3) * 10));
     ///     i
@@ -365,45 +362,41 @@ mod tests {
     #[test]
     fn map_with_multiple_threads() {
         assert!((0..100)
-            .into_iter()
             .map_parallel_limit(5, 7, |i| {
                 std::thread::sleep(Duration::from_millis((i % 3) * 10));
                 2 * i
             })
-            .eq((0..100).into_iter().map(|i| 2 * i)));
+            .eq((0..100).map(|i| 2 * i)));
     }
 
     #[test]
     fn map_with_single_thread() {
         assert!((0..100)
-            .into_iter()
             .map_parallel_limit(1, 7, |i| {
                 std::thread::sleep(Duration::from_millis((i % 3) * 10));
                 2 * i
             })
-            .eq((0..100).into_iter().map(|i| 2 * i)));
+            .eq((0..100).map(|i| 2 * i)));
     }
 
     #[test]
     fn map_with_zero_threads() {
         assert!((0..100)
-            .into_iter()
             .map_parallel_limit(0, 7, |i| {
                 std::thread::sleep(Duration::from_millis((i % 3) * 10));
                 2 * i
             })
-            .eq((0..100).into_iter().map(|i| 2 * i)));
+            .eq((0..100).map(|i| 2 * i)));
     }
 
     #[test]
     fn map_with_zero_buffer_size() {
         assert!((0..100)
-            .into_iter()
             .map_parallel_limit(5, 0, |i| {
                 std::thread::sleep(Duration::from_millis((i % 3) * 10));
                 2 * i
             })
-            .eq((0..100).into_iter().map(|i| 2 * i)));
+            .eq((0..100).map(|i| 2 * i)));
     }
 
     #[test]
@@ -428,9 +421,7 @@ mod tests {
 
     #[test]
     fn map_is_lazy() {
-        let _iter = (0..10)
-            .into_iter()
-            .map_parallel_limit(5, 7, |_| panic!("eager evaluation"));
+        let _iter = (0..10).map_parallel_limit(5, 7, |_| panic!("eager evaluation"));
     }
 
     #[test]
@@ -438,7 +429,6 @@ mod tests {
     #[ntest::timeout(1000)]
     fn map_propagates_panic() {
         let _ = (0..100)
-            .into_iter()
             .map_parallel_limit(5, 7, |i| {
                 if i == 13 {
                     panic!("boom");
@@ -480,7 +470,7 @@ mod tests {
         map.in_i = usize::MAX - 13;
         map.out_i = usize::MAX - 13;
 
-        assert!(map.eq((0..100).into_iter().map(|i| 2 * i)));
+        assert!(map.eq((0..100).map(|i| 2 * i)));
     }
 
     #[test]
@@ -510,16 +500,14 @@ mod tests {
         let counter = Arc::new(Mutex::new(0));
         let count = counter.clone();
 
-        let mut iter = (0..)
-            .into_iter()
-            .map_parallel_limit(threads, buffer_size, move |i| {
-                if i < consume {
-                    std::thread::sleep(Duration::from_millis(100));
-                }
-                let mut counter = counter.lock().unwrap();
-                *counter += 1;
-                2 * i
-            });
+        let mut iter = (0..).map_parallel_limit(threads, buffer_size, move |i| {
+            if i < consume {
+                std::thread::sleep(Duration::from_millis(100));
+            }
+            let mut counter = counter.lock().unwrap();
+            *counter += 1;
+            2 * i
+        });
         for _ in 0..consume {
             iter.next();
         }
-- 
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