remove some unneeded imports

14 files changed, 23 insertions, 46 deletions

diff --git a/library/std/src/collections/hash/map.rs b/library/std/src/collections/hash/map.rs
index 742c4cc7c55..3afc8287ecc 100644
--- a/library/std/src/collections/hash/map.rs
+++ b/library/std/src/collections/hash/map.rs
@@ -1446,7 +1446,6 @@ impl<'a, K, V> IterMut<'a, K, V> {
 /// (provided by the [`IntoIterator`] trait). See its documentation for more.
 ///
 /// [`into_iter`]: IntoIterator::into_iter
-/// [`IntoIterator`]: crate::iter::IntoIterator
 ///
 /// # Example
 ///
diff --git a/library/std/src/collections/hash/set.rs b/library/std/src/collections/hash/set.rs
index 837a18bff60..ac906e682d5 100644
--- a/library/std/src/collections/hash/set.rs
+++ b/library/std/src/collections/hash/set.rs
@@ -1272,7 +1272,6 @@ pub struct Iter<'a, K: 'a> {
 /// (provided by the [`IntoIterator`] trait). See its documentation for more.
 ///
 /// [`into_iter`]: IntoIterator::into_iter
-/// [`IntoIterator`]: crate::iter::IntoIterator
 ///
 /// # Examples
 ///
diff --git a/library/std/src/collections/mod.rs b/library/std/src/collections/mod.rs
index 575f56ff4df..49d3b7a1f61 100644
--- a/library/std/src/collections/mod.rs
+++ b/library/std/src/collections/mod.rs
@@ -395,8 +395,6 @@
 //! // ...but the key hasn't changed. b is still "baz", not "xyz".
 //! assert_eq!(map.keys().next().unwrap().b, "baz");
 //! ```
-//!
-//! [IntoIterator]: crate::iter::IntoIterator "iter::IntoIterator"
 
 #![stable(feature = "rust1", since = "1.0.0")]
 
diff --git a/library/std/src/ffi/os_str.rs b/library/std/src/ffi/os_str.rs
index 80ed34157e6..5c0541d3caf 100644
--- a/library/std/src/ffi/os_str.rs
+++ b/library/std/src/ffi/os_str.rs
@@ -6,7 +6,6 @@ use crate::cmp;
 use crate::collections::TryReserveError;
 use crate::fmt;
 use crate::hash::{Hash, Hasher};
-use crate::iter::Extend;
 use crate::ops;
 use crate::rc::Rc;
 use crate::str::FromStr;
diff --git a/library/std/src/io/error.rs b/library/std/src/io/error.rs
index 1cedd6eedfa..34c0ce9dcf8 100644
--- a/library/std/src/io/error.rs
+++ b/library/std/src/io/error.rs
@@ -11,7 +11,6 @@ mod repr_unpacked;
 #[cfg(not(target_pointer_width = "64"))]
 use repr_unpacked::Repr;
 
-use crate::convert::From;
 use crate::error;
 use crate::fmt;
 use crate::result;
diff --git a/library/std/src/keyword_docs.rs b/library/std/src/keyword_docs.rs
index 203c490fa29..43842bee992 100644
--- a/library/std/src/keyword_docs.rs
+++ b/library/std/src/keyword_docs.rs
@@ -1678,7 +1678,7 @@ mod super_keyword {}
 /// below `Iterator` is a **supertrait** and `ThreeIterator` is a **subtrait**:
 ///
 /// ```rust
-/// trait ThreeIterator: std::iter::Iterator {
+/// trait ThreeIterator: Iterator {
 ///     fn next_three(&mut self) -> Option<[Self::Item; 3]>;
 /// }
 /// ```
diff --git a/library/std/src/path.rs b/library/std/src/path.rs
index dbc18f7827e..8014ba992ea 100644
--- a/library/std/src/path.rs
+++ b/library/std/src/path.rs
@@ -78,7 +78,7 @@ use crate::fmt;
 use crate::fs;
 use crate::hash::{Hash, Hasher};
 use crate::io;
-use crate::iter::{self, FusedIterator};
+use crate::iter::FusedIterator;
 use crate::ops::{self, Deref};
 use crate::rc::Rc;
 use crate::str::FromStr;
@@ -450,26 +450,26 @@ impl<'a> PrefixComponent<'a> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> cmp::PartialEq for PrefixComponent<'a> {
+impl<'a> PartialEq for PrefixComponent<'a> {
     #[inline]
     fn eq(&self, other: &PrefixComponent<'a>) -> bool {
-        cmp::PartialEq::eq(&self.parsed, &other.parsed)
+        self.parsed == other.parsed
     }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> cmp::PartialOrd for PrefixComponent<'a> {
+impl<'a> PartialOrd for PrefixComponent<'a> {
     #[inline]
     fn partial_cmp(&self, other: &PrefixComponent<'a>) -> Option<cmp::Ordering> {
-        cmp::PartialOrd::partial_cmp(&self.parsed, &other.parsed)
+        PartialOrd::partial_cmp(&self.parsed, &other.parsed)
     }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Ord for PrefixComponent<'_> {
+impl Ord for PrefixComponent<'_> {
     #[inline]
     fn cmp(&self, other: &Self) -> cmp::Ordering {
-        cmp::Ord::cmp(&self.parsed, &other.parsed)
+        Ord::cmp(&self.parsed, &other.parsed)
     }
 }
 
@@ -988,7 +988,7 @@ impl<'a> DoubleEndedIterator for Components<'a> {
 impl FusedIterator for Components<'_> {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> cmp::PartialEq for Components<'a> {
+impl<'a> PartialEq for Components<'a> {
     #[inline]
     fn eq(&self, other: &Components<'a>) -> bool {
         let Components { path: _, front: _, back: _, has_physical_root: _, prefix: _ } = self;
@@ -1015,10 +1015,10 @@ impl<'a> cmp::PartialEq for Components<'a> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Eq for Components<'_> {}
+impl Eq for Components<'_> {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> cmp::PartialOrd for Components<'a> {
+impl<'a> PartialOrd for Components<'a> {
     #[inline]
     fn partial_cmp(&self, other: &Components<'a>) -> Option<cmp::Ordering> {
         Some(compare_components(self.clone(), other.clone()))
@@ -1026,7 +1026,7 @@ impl<'a> cmp::PartialOrd for Components<'a> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Ord for Components<'_> {
+impl Ord for Components<'_> {
     #[inline]
     fn cmp(&self, other: &Self) -> cmp::Ordering {
         compare_components(self.clone(), other.clone())
@@ -1741,7 +1741,7 @@ impl FromStr for PathBuf {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<P: AsRef<Path>> iter::FromIterator<P> for PathBuf {
+impl<P: AsRef<Path>> FromIterator<P> for PathBuf {
     fn from_iter<I: IntoIterator<Item = P>>(iter: I) -> PathBuf {
         let mut buf = PathBuf::new();
         buf.extend(iter);
@@ -1750,7 +1750,7 @@ impl<P: AsRef<Path>> iter::FromIterator<P> for PathBuf {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<P: AsRef<Path>> iter::Extend<P> for PathBuf {
+impl<P: AsRef<Path>> Extend<P> for PathBuf {
     fn extend<I: IntoIterator<Item = P>>(&mut self, iter: I) {
         iter.into_iter().for_each(move |p| self.push(p.as_ref()));
     }
@@ -1904,7 +1904,7 @@ impl ToOwned for Path {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::PartialEq for PathBuf {
+impl PartialEq for PathBuf {
     #[inline]
     fn eq(&self, other: &PathBuf) -> bool {
         self.components() == other.components()
@@ -1919,10 +1919,10 @@ impl Hash for PathBuf {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Eq for PathBuf {}
+impl Eq for PathBuf {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::PartialOrd for PathBuf {
+impl PartialOrd for PathBuf {
     #[inline]
     fn partial_cmp(&self, other: &PathBuf) -> Option<cmp::Ordering> {
         Some(compare_components(self.components(), other.components()))
@@ -1930,7 +1930,7 @@ impl cmp::PartialOrd for PathBuf {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Ord for PathBuf {
+impl Ord for PathBuf {
     #[inline]
     fn cmp(&self, other: &PathBuf) -> cmp::Ordering {
         compare_components(self.components(), other.components())
@@ -3025,7 +3025,7 @@ impl fmt::Display for Display<'_> {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::PartialEq for Path {
+impl PartialEq for Path {
     #[inline]
     fn eq(&self, other: &Path) -> bool {
         self.components() == other.components()
@@ -3084,10 +3084,10 @@ impl Hash for Path {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Eq for Path {}
+impl Eq for Path {}
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::PartialOrd for Path {
+impl PartialOrd for Path {
     #[inline]
     fn partial_cmp(&self, other: &Path) -> Option<cmp::Ordering> {
         Some(compare_components(self.components(), other.components()))
@@ -3095,7 +3095,7 @@ impl cmp::PartialOrd for Path {
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-impl cmp::Ord for Path {
+impl Ord for Path {
     #[inline]
     fn cmp(&self, other: &Path) -> cmp::Ordering {
         compare_components(self.components(), other.components())
diff --git a/library/std/src/prelude/mod.rs b/library/std/src/prelude/mod.rs
index c314bbbb68e..1b29c887d21 100644
--- a/library/std/src/prelude/mod.rs
+++ b/library/std/src/prelude/mod.rs
@@ -34,7 +34,7 @@
 //!   marker traits that indicate fundamental properties of types.
 //! * <code>[std::ops]::{[Drop], [Fn], [FnMut], [FnOnce]}</code>, various
 //!   operations for both destructors and overloading `()`.
-//! * <code>[std::mem]::[drop][mem::drop]</code>, a convenience function for explicitly
+//! * <code>[std::mem]::[drop]</code>, a convenience function for explicitly
 //!   dropping a value.
 //! * <code>[std::boxed]::[Box]</code>, a way to allocate values on the heap.
 //! * <code>[std::borrow]::[ToOwned]</code>, the conversion trait that defines
@@ -66,7 +66,6 @@
 //! * <code>[std::convert]::{[TryFrom], [TryInto]}</code>,
 //! * <code>[std::iter]::[FromIterator]</code>.
 //!
-//! [mem::drop]: crate::mem::drop
 //! [std::borrow]: crate::borrow
 //! [std::boxed]: crate::boxed
 //! [std::clone]: crate::clone
@@ -86,9 +85,6 @@
 //! [std::slice]: crate::slice
 //! [std::string]: crate::string
 //! [std::vec]: mod@crate::vec
-//! [TryFrom]: crate::convert::TryFrom
-//! [TryInto]: crate::convert::TryInto
-//! [FromIterator]: crate::iter::FromIterator
 //! [`to_owned`]: crate::borrow::ToOwned::to_owned
 //! [book-closures]: ../../book/ch13-01-closures.html
 //! [book-dtor]: ../../book/ch15-03-drop.html
diff --git a/library/std/src/primitive_docs.rs b/library/std/src/primitive_docs.rs
index 51e6947a9c2..3df990e5dd9 100644
--- a/library/std/src/primitive_docs.rs
+++ b/library/std/src/primitive_docs.rs
@@ -577,7 +577,6 @@ impl Copy for () {
 /// [`is_null`]: pointer::is_null
 /// [`offset`]: pointer::offset
 #[doc = concat!("[`into_raw`]: ", include_str!("../primitive_docs/box_into_raw.md"))]
-/// [`drop`]: mem::drop
 /// [`write`]: ptr::write
 #[stable(feature = "rust1", since = "1.0.0")]
 mod prim_pointer {}
@@ -1026,7 +1025,6 @@ mod prim_str {}
 /// * [`UnwindSafe`]
 /// * [`RefUnwindSafe`]
 ///
-/// [`Unpin`]: marker::Unpin
 /// [`UnwindSafe`]: panic::UnwindSafe
 /// [`RefUnwindSafe`]: panic::RefUnwindSafe
 ///
@@ -1405,10 +1403,6 @@ mod prim_ref {}
 ///
 /// *See also the traits [`Fn`], [`FnMut`], and [`FnOnce`].*
 ///
-/// [`Fn`]: ops::Fn
-/// [`FnMut`]: ops::FnMut
-/// [`FnOnce`]: ops::FnOnce
-///
 /// Function pointers are pointers that point to *code*, not data. They can be called
 /// just like functions. Like references, function pointers are, among other things, assumed to
 /// not be null, so if you want to pass a function pointer over FFI and be able to accommodate null
diff --git a/library/std/src/sys/sgx/abi/usercalls/alloc.rs b/library/std/src/sys/sgx/abi/usercalls/alloc.rs
index 0d934318c22..01505e94487 100644
--- a/library/std/src/sys/sgx/abi/usercalls/alloc.rs
+++ b/library/std/src/sys/sgx/abi/usercalls/alloc.rs
@@ -3,7 +3,6 @@
 use crate::arch::asm;
 use crate::cell::UnsafeCell;
 use crate::cmp;
-use crate::convert::TryInto;
 use crate::mem;
 use crate::ops::{CoerceUnsized, Deref, DerefMut, Index, IndexMut};
 use crate::ptr::{self, NonNull};
diff --git a/library/std/src/sys/unix/futex.rs b/library/std/src/sys/unix/futex.rs
index 8d5b540212a..d310be6c7a1 100644
--- a/library/std/src/sys/unix/futex.rs
+++ b/library/std/src/sys/unix/futex.rs
@@ -273,8 +273,6 @@ pub mod zircon {
 
 #[cfg(target_os = "fuchsia")]
 pub fn futex_wait(futex: &AtomicU32, expected: u32, timeout: Option<Duration>) -> bool {
-    use crate::convert::TryFrom;
-
     // Sleep forever if the timeout is longer than fits in a i64.
     let deadline = timeout
         .and_then(|d| {
diff --git a/library/std/src/sys/unix/os.rs b/library/std/src/sys/unix/os.rs
index 1c44058aff7..a345af76fa2 100644
--- a/library/std/src/sys/unix/os.rs
+++ b/library/std/src/sys/unix/os.rs
@@ -7,7 +7,6 @@ mod tests;
 
 use crate::os::unix::prelude::*;
 
-use crate::convert::TryFrom;
 use crate::error::Error as StdError;
 use crate::ffi::{CStr, CString, OsStr, OsString};
 use crate::fmt;
diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs
index d4c7e58b34d..e45c380a0bb 100644
--- a/library/std/src/sys/unix/process/process_fuchsia.rs
+++ b/library/std/src/sys/unix/process/process_fuchsia.rs
@@ -166,7 +166,6 @@ impl Process {
     }
 
     pub fn wait(&mut self) -> io::Result<ExitStatus> {
-        use crate::default::Default;
         use crate::sys::process::zircon::*;
 
         let mut proc_info: zx_info_process_t = Default::default();
@@ -199,7 +198,6 @@ impl Process {
     }
 
     pub fn try_wait(&mut self) -> io::Result<Option<ExitStatus>> {
-        use crate::default::Default;
         use crate::sys::process::zircon::*;
 
         let mut proc_info: zx_info_process_t = Default::default();
diff --git a/library/std/src/sys_common/net.rs b/library/std/src/sys_common/net.rs
index eb427dbda23..cb24caa1e8a 100644
--- a/library/std/src/sys_common/net.rs
+++ b/library/std/src/sys_common/net.rs
@@ -2,7 +2,6 @@
 mod tests;
 
 use crate::cmp;
-use crate::convert::{TryFrom, TryInto};
 use crate::fmt;
 use crate::io::{self, BorrowedCursor, ErrorKind, IoSlice, IoSliceMut};
 use crate::mem;