Auto merge of #43487 - Mark-Simulacrum:rollup, r=Mark-Simulacrum

Rollup of 10 pull requests

- Successful merges: #42959, #43447, #43455, #43456, #43458, #43462, #43463, #43465, #43471, #43480
- Failed merges:

3 files changed, 5 insertions, 4 deletions

diff --git a/src/libstd/build.rs b/src/libstd/build.rs
index 2abd47ab8df..0b5c2db171d 100644
--- a/src/libstd/build.rs
+++ b/src/libstd/build.rs
@@ -45,6 +45,7 @@ fn main() {
         println!("cargo:rustc-link-lib=socket");
         println!("cargo:rustc-link-lib=posix4");
         println!("cargo:rustc-link-lib=pthread");
+        println!("cargo:rustc-link-lib=resolv");
     } else if target.contains("apple-darwin") {
         println!("cargo:rustc-link-lib=System");
 
diff --git a/src/libstd/collections/hash/table.rs b/src/libstd/collections/hash/table.rs
index 06f4f7643ec..3844690860b 100644
--- a/src/libstd/collections/hash/table.rs
+++ b/src/libstd/collections/hash/table.rs
@@ -44,7 +44,7 @@ impl TaggedHashUintPtr {
     #[inline]
     unsafe fn new(ptr: *mut HashUint) -> Self {
         debug_assert!(ptr as usize & 1 == 0 || ptr as usize == EMPTY as usize);
-        TaggedHashUintPtr(Unique::new(ptr))
+        TaggedHashUintPtr(Unique::new_unchecked(ptr))
     }
 
     #[inline]
@@ -56,7 +56,7 @@ impl TaggedHashUintPtr {
             } else {
                 usize_ptr &= !1;
             }
-            self.0 = Unique::new(usize_ptr as *mut HashUint)
+            self.0 = Unique::new_unchecked(usize_ptr as *mut HashUint)
         }
     }
 
@@ -877,7 +877,7 @@ impl<K, V> RawTable<K, V> {
                 elems_left: elems_left,
                 marker: marker::PhantomData,
             },
-            table: unsafe { Shared::new(self) },
+            table: Shared::from(self),
             marker: marker::PhantomData,
         }
     }
diff --git a/src/libstd/thread/mod.rs b/src/libstd/thread/mod.rs
index c35676f2709..2ae62f8c3e0 100644
--- a/src/libstd/thread/mod.rs
+++ b/src/libstd/thread/mod.rs
@@ -413,7 +413,7 @@ impl Builder {
 ///   *by value* from the thread where it is spawned to the new thread. Its
 ///   return value will need to be passed from the new thread to the thread
 ///   where it is `join`ed.
-///   As a reminder, the [`Send`] marker trait, expresses that it is safe to be
+///   As a reminder, the [`Send`] marker trait expresses that it is safe to be
 ///   passed from thread to thread. [`Sync`] expresses that it is safe to have a
 ///   reference be passed from thread to thread.
 ///