Rollup merge of #58553 - scottmcm:more-ihle, r=Centril

Use more impl header lifetime elision

Inspired by seeing explicit lifetimes on these two:

- https://doc.rust-lang.org/nightly/std/slice/struct.Iter.html#impl-FusedIterator
- https://doc.rust-lang.org/nightly/std/primitive.u32.html#impl-Not

And a follow-up to https://github.com/rust-lang/rust/pull/54687, that started using IHLE in libcore.

Most of the changes in here fall into two big categories:

- Removing lifetimes from common traits that can essentially never user a lifetime from an input (particularly `Drop`, `Debug`, and `Clone`)

- Forwarding impls that are only possible because the lifetime doesn't matter (like `impl<R: Read + ?Sized> Read for &mut R`)

I omitted things that seemed like they could be more controversial, like the handful of iterators that have a `Item: 'static` despite the iterator having a lifetime or the `PartialEq` implementations [where the flipped one cannot elide the lifetime](https://internals.rust-lang.org/t/impl-type-parameter-aliases/9403/2?u=scottmcm).

I also removed two lifetimes that turned out to be completely unused; see https://github.com/rust-lang/rust/issues/41960#issuecomment-464557423

1 files changed, 2 insertions, 2 deletions

diff --git a/src/libstd/net/tcp.rs b/src/libstd/net/tcp.rs
index 3eb2a332d26..51bd76ae436 100644
--- a/src/libstd/net/tcp.rs
+++ b/src/libstd/net/tcp.rs
@@ -580,7 +580,7 @@ impl Write for TcpStream {
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> Read for &'a TcpStream {
+impl Read for &TcpStream {
     fn read(&mut self, buf: &mut [u8]) -> io::Result<usize> { self.0.read(buf) }
 
     #[inline]
@@ -589,7 +589,7 @@ impl<'a> Read for &'a TcpStream {
     }
 }
 #[stable(feature = "rust1", since = "1.0.0")]
-impl<'a> Write for &'a TcpStream {
+impl Write for &TcpStream {
     fn write(&mut self, buf: &[u8]) -> io::Result<usize> { self.0.write(buf) }
     fn flush(&mut self) -> io::Result<()> { Ok(()) }
 }