From c46f78dace07885c669fa010e04ec6b706aa810d Mon Sep 17 00:00:00 2001
From: Philippe Cholet <44676486+Philippe-Cholet@users.noreply.github.com>
Date: Sat, 23 Sep 2023 11:08:46 +0200
Subject: [PATCH 1/2] `try_collect` without `use_alloc`

We can want to collect to a stack-based structure such as `arrayvec`.
---
 src/lib.rs | 2 --
 1 file changed, 2 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 458ffe67c..77bc2aad2 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -70,7 +70,6 @@ use std::hash::Hash;
 use std::iter::{once, IntoIterator};
 #[cfg(feature = "use_alloc")]
 type VecIntoIter<T> = alloc::vec::IntoIter<T>;
-#[cfg(feature = "use_alloc")]
 use std::iter::FromIterator;
 
 #[macro_use]
@@ -2214,7 +2213,6 @@ pub trait Itertools: Iterator {
     ///     Ok(())
     /// }
     /// ```
-    #[cfg(feature = "use_alloc")]
     fn try_collect<T, U, E>(self) -> Result<U, E>
     where
         Self: Sized + Iterator<Item = Result<T, E>>,

From de163352e4c855725de82f0d6adca378fe85e8b7 Mon Sep 17 00:00:00 2001
From: Philippe Cholet <44676486+Philippe-Cholet@users.noreply.github.com>
Date: Sat, 23 Sep 2023 12:16:51 +0200
Subject: [PATCH 2/2] `extrema_set` only needs `alloc`

---
 src/extrema_set.rs |  2 ++
 src/lib.rs         | 14 +++++++-------
 2 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/src/extrema_set.rs b/src/extrema_set.rs
index ae128364c..d24114c6d 100644
--- a/src/extrema_set.rs
+++ b/src/extrema_set.rs
@@ -1,3 +1,5 @@
+#![cfg(feature = "use_alloc")]
+use alloc::{vec, vec::Vec};
 use std::cmp::Ordering;
 
 /// Implementation guts for `min_set`, `min_set_by`, and `min_set_by_key`.
diff --git a/src/lib.rs b/src/lib.rs
index 77bc2aad2..3d5f05c4f 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -177,7 +177,7 @@ mod diff;
 #[cfg(feature = "use_std")]
 mod duplicates_impl;
 mod exactly_one_err;
-#[cfg(feature = "use_std")]
+#[cfg(feature = "use_alloc")]
 mod extrema_set;
 mod flatten_ok;
 mod format;
@@ -3169,7 +3169,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn min_set(self) -> Vec<Self::Item>
     where
         Self: Sized,
@@ -3202,7 +3202,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn min_set_by<F>(self, mut compare: F) -> Vec<Self::Item>
     where
         Self: Sized,
@@ -3234,7 +3234,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn min_set_by_key<K, F>(self, key: F) -> Vec<Self::Item>
     where
         Self: Sized,
@@ -3266,7 +3266,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn max_set(self) -> Vec<Self::Item>
     where
         Self: Sized,
@@ -3299,7 +3299,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn max_set_by<F>(self, mut compare: F) -> Vec<Self::Item>
     where
         Self: Sized,
@@ -3331,7 +3331,7 @@ pub trait Itertools: Iterator {
     ///
     /// The elements can be floats but no particular result is guaranteed
     /// if an element is NaN.
-    #[cfg(feature = "use_std")]
+    #[cfg(feature = "use_alloc")]
     fn max_set_by_key<K, F>(self, key: F) -> Vec<Self::Item>
     where
         Self: Sized,