Use prelude FromIterator

(cherry picked from commit ffd875b)

benches/bench.rs

@@ -15,7 +15,6 @@ use test::Bencher;
 use indexmap::IndexMap;
 
 use std::collections::HashMap;
-use std::iter::FromIterator;
 
 use rand::rngs::SmallRng;
 use rand::seq::SliceRandom;

benches/faststring.rs

@@ -7,7 +7,6 @@ use test::Bencher;
 use indexmap::IndexMap;
 
 use std::collections::HashMap;
-use std::iter::FromIterator;
 
 use rand::rngs::SmallRng;
 use rand::seq::SliceRandom;

src/map.rs

@@ -12,7 +12,7 @@ use crate::vec::{self, Vec};
 use ::core::cmp::Ordering;
 use ::core::fmt;
 use ::core::hash::{BuildHasher, Hash, Hasher};
-use ::core::iter::{FromIterator, FusedIterator};
+use ::core::iter::FusedIterator;
 use ::core::ops::{Index, IndexMut, RangeBounds};
 use ::core::slice::{Iter as SliceIter, IterMut as SliceIterMut};
 
@@ -1406,7 +1406,7 @@ where
  /// assert_eq!(map1, map2);
  /// ```
  fn from(arr: [(K, V); N]) -> Self {
- std::array::IntoIter::new(arr).collect()
+ Self::from_iter(arr)
  }
 }
 

src/set.rs

@@ -10,7 +10,7 @@ use crate::vec::{self, Vec};
 use core::cmp::Ordering;
 use core::fmt;
 use core::hash::{BuildHasher, Hash};
-use core::iter::{Chain, FromIterator, FusedIterator};
+use core::iter::{Chain, FusedIterator};
 use core::ops::{BitAnd, BitOr, BitXor, Index, RangeBounds, Sub};
 use core::slice;
 
@@ -903,7 +903,7 @@ where
  /// assert_eq!(set1, set2);
  /// ```
  fn from(arr: [T; N]) -> Self {
- std::array::IntoIter::new(arr).collect()
+ Self::from_iter(arr)
  }
 }
 

test-nostd/src/lib.rs

@@ -2,7 +2,6 @@
 
 use core::hash::BuildHasherDefault;
 use core::hash::Hasher;
-use core::iter::FromIterator;
 
 use indexmap::IndexMap;
 use indexmap::IndexSet;

tests/quick.rs

@@ -16,7 +16,6 @@ use std::collections::HashMap;
 use std::collections::HashSet;
 use std::fmt::Debug;
 use std::hash::Hash;
-use std::iter::FromIterator;
 use std::ops::Bound;
 use std::ops::Deref;