Switch all libraries to the 2021 edition

6 files changed, 0 insertions, 28 deletions

diff --git a/library/core/src/array/mod.rs b/library/core/src/array/mod.rs
index 37292bf8e26..121aa634deb 100644
--- a/library/core/src/array/mod.rs
+++ b/library/core/src/array/mod.rs
@@ -66,8 +66,6 @@ where
 ///
 /// ```rust
 /// #![feature(array_from_fn)]
-/// # // Apparently these doc tests are still on edition2018
-/// # use std::convert::TryInto;
 ///
 /// let array: Result<[u8; 5], _> = std::array::try_from_fn(|i| i.try_into());
 /// assert_eq!(array, Ok([0, 1, 2, 3, 4]));
diff --git a/library/core/src/convert/mod.rs b/library/core/src/convert/mod.rs
index 1c2e673d604..d40f69f8b35 100644
--- a/library/core/src/convert/mod.rs
+++ b/library/core/src/convert/mod.rs
@@ -426,8 +426,6 @@ pub trait TryInto<T>: Sized {
 /// `TryFrom<T>` can be implemented as follows:
 ///
 /// ```
-/// use std::convert::TryFrom;
-///
 /// struct GreaterThanZero(i32);
 ///
 /// impl TryFrom<i32> for GreaterThanZero {
@@ -448,8 +446,6 @@ pub trait TryInto<T>: Sized {
 /// As described, [`i32`] implements `TryFrom<`[`i64`]`>`:
 ///
 /// ```
-/// use std::convert::TryFrom;
-///
 /// let big_number = 1_000_000_000_000i64;
 /// // Silently truncates `big_number`, requires detecting
 /// // and handling the truncation after the fact.
diff --git a/library/core/src/iter/traits/collect.rs b/library/core/src/iter/traits/collect.rs
index 56fad602cf9..26c97b8ed78 100644
--- a/library/core/src/iter/traits/collect.rs
+++ b/library/core/src/iter/traits/collect.rs
@@ -15,8 +15,6 @@
 /// Basic usage:
 ///
 /// ```
-/// use std::iter::FromIterator;
-///
 /// let five_fives = std::iter::repeat(5).take(5);
 ///
 /// let v = Vec::from_iter(five_fives);
@@ -37,8 +35,6 @@
 /// Implementing `FromIterator` for your type:
 ///
 /// ```
-/// use std::iter::FromIterator;
-///
 /// // A sample collection, that's just a wrapper over Vec<T>
 /// #[derive(Debug)]
 /// struct MyCollection(Vec<i32>);
@@ -102,8 +98,6 @@ pub trait FromIterator<A>: Sized {
     /// Basic usage:
     ///
     /// ```
-    /// use std::iter::FromIterator;
-    ///
     /// let five_fives = std::iter::repeat(5).take(5);
     ///
     /// let v = Vec::from_iter(five_fives);
diff --git a/library/core/src/iter/traits/iterator.rs b/library/core/src/iter/traits/iterator.rs
index 9a9a844f41b..2049adafa2f 100644
--- a/library/core/src/iter/traits/iterator.rs
+++ b/library/core/src/iter/traits/iterator.rs
@@ -1155,8 +1155,6 @@ pub trait Iterator {
     /// Stopping after an initial [`None`]:
     ///
     /// ```
-    /// use std::convert::TryFrom;
-    ///
     /// let a = [0, 1, 2, -3, 4, 5, -6];
     ///
     /// let iter = a.iter().map_while(|x| u32::try_from(*x).ok());
@@ -1172,8 +1170,6 @@ pub trait Iterator {
     /// removed:
     ///
     /// ```
-    /// use std::convert::TryFrom;
-    ///
     /// let a = [1, 2, -3, 4];
     /// let mut iter = a.iter();
     ///
diff --git a/library/core/src/num/int_macros.rs b/library/core/src/num/int_macros.rs
index e6ae4afd7c1..6f7c5a6d119 100644
--- a/library/core/src/num/int_macros.rs
+++ b/library/core/src/num/int_macros.rs
@@ -2602,8 +2602,6 @@ macro_rules! int_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_be_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;
@@ -2633,8 +2631,6 @@ macro_rules! int_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_le_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;
@@ -2675,8 +2671,6 @@ macro_rules! int_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_ne_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;
diff --git a/library/core/src/num/uint_macros.rs b/library/core/src/num/uint_macros.rs
index 3cc454baf35..1dd8b0a18ab 100644
--- a/library/core/src/num/uint_macros.rs
+++ b/library/core/src/num/uint_macros.rs
@@ -2323,8 +2323,6 @@ macro_rules! uint_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_be_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;
@@ -2354,8 +2352,6 @@ macro_rules! uint_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_le_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;
@@ -2396,8 +2392,6 @@ macro_rules! uint_impl {
         /// When starting from a slice rather than an array, fallible conversion APIs can be used:
         ///
         /// ```
-        /// use std::convert::TryInto;
-        ///
         #[doc = concat!("fn read_ne_", stringify!($SelfT), "(input: &mut &[u8]) -> ", stringify!($SelfT), " {")]
         #[doc = concat!("    let (int_bytes, rest) = input.split_at(std::mem::size_of::<", stringify!($SelfT), ">());")]
         ///     *input = rest;