Auto merge of #69986 - JohnTitor:rollup-h0809mf, r=JohnTitor

Rollup of 12 pull requests

Successful merges:

 - #69403 (Implement `Copy` for `IoSlice`)
 - #69460 (Move some `build-pass` tests to `check-pass`)
 - #69723 (Added doc on keyword Pub.)
 - #69802 (fix more clippy findings)
 - #69809 (remove lifetimes that can be elided (clippy::needless_lifetimes))
 - #69947 (Clean up E0423 explanation)
 - #69949 (triagebot.toml: add ping aliases)
 - #69954 (rename panic_if_ intrinsics to assert_)
 - #69960 (miri engine: fix treatment of abort intrinsic)
 - #69966 (Add more regression tests)
 - #69973 (Update stable-since version for const_int_conversion)
 - #69974 (Clean up E0434 explanation)

Failed merges:

r? @ghost

14 files changed, 24 insertions, 8 deletions

diff --git a/src/libstd/io/mod.rs b/src/libstd/io/mod.rs
index 420d6ea589a..dc831432c17 100644
--- a/src/libstd/io/mod.rs
+++ b/src/libstd/io/mod.rs
@@ -1050,6 +1050,7 @@ impl<'a> DerefMut for IoSliceMut<'a> {
 /// ABI compatible with the `iovec` type on Unix platforms and `WSABUF` on
 /// Windows.
 #[stable(feature = "iovec", since = "1.36.0")]
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a>(sys::io::IoSlice<'a>);
 
diff --git a/src/libstd/keyword_docs.rs b/src/libstd/keyword_docs.rs
index 3c69c1160d5..2702de15b85 100644
--- a/src/libstd/keyword_docs.rs
+++ b/src/libstd/keyword_docs.rs
@@ -925,9 +925,15 @@ mod mut_keyword {}
 //
 /// Make an item visible to others.
 ///
-/// The documentation for this keyword is [not yet complete]. Pull requests welcome!
+/// The keyword `pub` makes any module, function, or data structure accessible from inside
+/// of external modules. The `pub` keyword may also be used in a `use` declaration to re-export
+/// an identifier from a namespace.
 ///
-/// [not yet complete]: https://github.com/rust-lang/rust/issues/34601
+/// For more information on the `pub` keyword, please see the visibility section
+/// of the [reference] and for some examples, see [Rust by Example].
+///
+/// [reference]:../reference/visibility-and-privacy.html?highlight=pub#visibility-and-privacy
+/// [Rust by Example]:../rust-by-example/mod/visibility.html
 mod pub_keyword {}
 
 #[doc(keyword = "ref")]
diff --git a/src/libstd/sys/cloudabi/io.rs b/src/libstd/sys/cloudabi/io.rs
index 976e122463d..d5f475b4310 100644
--- a/src/libstd/sys/cloudabi/io.rs
+++ b/src/libstd/sys/cloudabi/io.rs
@@ -1,5 +1,6 @@
 use crate::mem;
 
+#[derive(Copy, Clone)]
 pub struct IoSlice<'a>(&'a [u8]);
 
 impl<'a> IoSlice<'a> {
diff --git a/src/libstd/sys/hermit/io.rs b/src/libstd/sys/hermit/io.rs
index 976e122463d..d5f475b4310 100644
--- a/src/libstd/sys/hermit/io.rs
+++ b/src/libstd/sys/hermit/io.rs
@@ -1,5 +1,6 @@
 use crate::mem;
 
+#[derive(Copy, Clone)]
 pub struct IoSlice<'a>(&'a [u8]);
 
 impl<'a> IoSlice<'a> {
diff --git a/src/libstd/sys/sgx/io.rs b/src/libstd/sys/sgx/io.rs
index 976e122463d..d5f475b4310 100644
--- a/src/libstd/sys/sgx/io.rs
+++ b/src/libstd/sys/sgx/io.rs
@@ -1,5 +1,6 @@
 use crate::mem;
 
+#[derive(Copy, Clone)]
 pub struct IoSlice<'a>(&'a [u8]);
 
 impl<'a> IoSlice<'a> {
diff --git a/src/libstd/sys/unix/io.rs b/src/libstd/sys/unix/io.rs
index b4a64e93c84..deb5ee76bd0 100644
--- a/src/libstd/sys/unix/io.rs
+++ b/src/libstd/sys/unix/io.rs
@@ -3,6 +3,7 @@ use crate::slice;
 
 use libc::{c_void, iovec};
 
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a> {
     vec: iovec,
diff --git a/src/libstd/sys/vxworks/io.rs b/src/libstd/sys/vxworks/io.rs
index f1a2c8446ff..0f68ebf8da9 100644
--- a/src/libstd/sys/vxworks/io.rs
+++ b/src/libstd/sys/vxworks/io.rs
@@ -3,6 +3,7 @@ use crate::slice;
 
 use libc::{c_void, iovec};
 
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a> {
     vec: iovec,
diff --git a/src/libstd/sys/wasi/io.rs b/src/libstd/sys/wasi/io.rs
index ee20ea6dab8..0ad2e152855 100644
--- a/src/libstd/sys/wasi/io.rs
+++ b/src/libstd/sys/wasi/io.rs
@@ -1,6 +1,7 @@
 use crate::marker::PhantomData;
 use crate::slice;
 
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a> {
     vec: wasi::Ciovec,
diff --git a/src/libstd/sys/wasm/io.rs b/src/libstd/sys/wasm/io.rs
index 976e122463d..d5f475b4310 100644
--- a/src/libstd/sys/wasm/io.rs
+++ b/src/libstd/sys/wasm/io.rs
@@ -1,5 +1,6 @@
 use crate::mem;
 
+#[derive(Copy, Clone)]
 pub struct IoSlice<'a>(&'a [u8]);
 
 impl<'a> IoSlice<'a> {
diff --git a/src/libstd/sys/windows/c.rs b/src/libstd/sys/windows/c.rs
index 4d377341be3..d7e1a801030 100644
--- a/src/libstd/sys/windows/c.rs
+++ b/src/libstd/sys/windows/c.rs
@@ -295,6 +295,7 @@ pub struct WSADATA {
     pub szSystemStatus: [u8; WSASYS_STATUS_LEN + 1],
 }
 
+#[derive(Copy, Clone)]
 #[repr(C)]
 pub struct WSABUF {
     pub len: ULONG,
diff --git a/src/libstd/sys/windows/io.rs b/src/libstd/sys/windows/io.rs
index 9d8018fd5e8..5525d283252 100644
--- a/src/libstd/sys/windows/io.rs
+++ b/src/libstd/sys/windows/io.rs
@@ -2,6 +2,7 @@ use crate::marker::PhantomData;
 use crate::slice;
 use crate::sys::c;
 
+#[derive(Copy, Clone)]
 #[repr(transparent)]
 pub struct IoSlice<'a> {
     vec: c::WSABUF,
diff --git a/src/libstd/sys_common/backtrace.rs b/src/libstd/sys_common/backtrace.rs
index 289ee07babf..2c7ba8f8ea1 100644
--- a/src/libstd/sys_common/backtrace.rs
+++ b/src/libstd/sys_common/backtrace.rs
@@ -70,7 +70,7 @@ unsafe fn _print_fmt(fmt: &mut fmt::Formatter<'_>, print_fmt: PrintFmt) -> fmt::
     let mut print_path = move |fmt: &mut fmt::Formatter<'_>, bows: BytesOrWideString<'_>| {
         output_filename(fmt, bows, print_fmt, cwd.as_ref())
     };
-    write!(fmt, "stack backtrace:\n")?;
+    writeln!(fmt, "stack backtrace:")?;
     let mut bt_fmt = BacktraceFmt::new(fmt, print_fmt, &mut print_path);
     bt_fmt.add_context()?;
     let mut idx = 0;
diff --git a/src/libstd/sys_common/process.rs b/src/libstd/sys_common/process.rs
index 042641852b3..f3a2962098b 100644
--- a/src/libstd/sys_common/process.rs
+++ b/src/libstd/sys_common/process.rs
@@ -47,7 +47,7 @@ impl CommandEnv {
             }
         }
         for (key, maybe_val) in self.vars.iter() {
-            if let &Some(ref val) = maybe_val {
+            if let Some(ref val) = maybe_val {
                 env::set_var(key, val);
             } else {
                 env::remove_var(key);
diff --git a/src/libstd/sys_common/wtf8.rs b/src/libstd/sys_common/wtf8.rs
index 1d96cdfe460..7509e1ee35d 100644
--- a/src/libstd/sys_common/wtf8.rs
+++ b/src/libstd/sys_common/wtf8.rs
@@ -603,8 +603,8 @@ impl Wtf8 {
         if len < 3 {
             return None;
         }
-        match &self.bytes[(len - 3)..] {
-            &[0xED, b2 @ 0xA0..=0xAF, b3] => Some(decode_surrogate(b2, b3)),
+        match self.bytes[(len - 3)..] {
+            [0xED, b2 @ 0xA0..=0xAF, b3] => Some(decode_surrogate(b2, b3)),
             _ => None,
         }
     }
@@ -615,8 +615,8 @@ impl Wtf8 {
         if len < 3 {
             return None;
         }
-        match &self.bytes[..3] {
-            &[0xED, b2 @ 0xB0..=0xBF, b3] => Some(decode_surrogate(b2, b3)),
+        match self.bytes[..3] {
+            [0xED, b2 @ 0xB0..=0xBF, b3] => Some(decode_surrogate(b2, b3)),
             _ => None,
         }
     }