Auto merge of #75966 - Dylan-DPC:rollup-srfpces, r=Dylan-DPC

Rollup of 10 pull requests

Successful merges:

 - #74730 (Hexagon libstd: update type defs)
 - #75758 (Fixes for VxWorks)
 - #75780 (Unconfuse Unpin docs a bit)
 - #75806 (Prevent automatic page change when using history)
 - #75818 (Update docs for SystemTime Windows implementation)
 - #75837 (Fix font color for help button in ayu and dark themes)
 - #75870 (Unify theme choices border color in ayu theme)
 - #75875 (Shorten liballoc vec resize intra-doc link)
 - #75953 (Fix swapped stability attributes for rustdoc lints)
 - #75958 (Avoid function-scoping global variables)

Failed merges:

r? @ghost

14 files changed, 86 insertions, 79 deletions

diff --git a/library/alloc/src/vec.rs b/library/alloc/src/vec.rs
index 058a06e1326..b4ad238680f 100644
--- a/library/alloc/src/vec.rs
+++ b/library/alloc/src/vec.rs
@@ -1456,9 +1456,9 @@ impl<T> Vec<T> {
     /// If `new_len` is less than `len`, the `Vec` is simply truncated.
     ///
     /// This method uses a closure to create new values on every push. If
-    /// you'd rather [`Clone`] a given value, use [`resize`]. If you want
-    /// to use the [`Default`] trait to generate values, you can pass
-    /// [`Default::default()`] as the second argument.
+    /// you'd rather [`Clone`] a given value, use [`Vec::resize`]. If you
+    /// want to use the [`Default`] trait to generate values, you can
+    /// pass [`Default::default`] as the second argument.
     ///
     /// # Examples
     ///
@@ -1472,8 +1472,6 @@ impl<T> Vec<T> {
     /// vec.resize_with(4, || { p *= 2; p });
     /// assert_eq!(vec, [2, 4, 8, 16]);
     /// ```
-    ///
-    /// [`resize`]: Vec::resize
     #[stable(feature = "vec_resize_with", since = "1.33.0")]
     pub fn resize_with<F>(&mut self, new_len: usize, f: F)
     where
diff --git a/library/core/src/marker.rs b/library/core/src/marker.rs
index 9326aaf5684..b44ca95b002 100644
--- a/library/core/src/marker.rs
+++ b/library/core/src/marker.rs
@@ -728,23 +728,23 @@ unsafe impl<T: ?Sized> Freeze for &mut T {}
 
 /// Types that can be safely moved after being pinned.
 ///
-/// Since Rust itself has no notion of immovable types, and considers moves
-/// (e.g., through assignment or [`mem::replace`]) to always be safe,
-/// this trait cannot prevent types from moving by itself.
+/// Rust itself has no notion of immovable types, and considers moves (e.g.,
+/// through assignment or [`mem::replace`]) to always be safe.
 ///
-/// Instead it is used to prevent moves through the type system,
-/// by controlling the behavior of pointers `P` wrapped in the [`Pin<P>`] wrapper,
-/// which "pin" the type in place by not allowing it to be moved out of them.
-/// See the [`pin module`] documentation for more information on pinning.
+/// The [`Pin`][Pin] type is used instead to prevent moves through the type
+/// system. Pointers `P<T>` wrapped in the [`Pin<P<T>>`][Pin] wrapper can't be
+/// moved out of. See the [`pin module`] documentation for more information on
+/// pinning.
 ///
-/// Implementing this trait lifts the restrictions of pinning off a type,
-/// which then allows it to move out with functions such as [`mem::replace`].
+/// Implementing the `Unpin` trait for `T` lifts the restrictions of pinning off
+/// the type, which then allows moving `T` out of [`Pin<P<T>>`][Pin] with
+/// functions such as [`mem::replace`].
 ///
 /// `Unpin` has no consequence at all for non-pinned data. In particular,
 /// [`mem::replace`] happily moves `!Unpin` data (it works for any `&mut T`, not
-/// just when `T: Unpin`). However, you cannot use
-/// [`mem::replace`] on data wrapped inside a [`Pin<P>`] because you cannot get the
-/// `&mut T` you need for that, and *that* is what makes this system work.
+/// just when `T: Unpin`). However, you cannot use [`mem::replace`] on data
+/// wrapped inside a [`Pin<P<T>>`][Pin] because you cannot get the `&mut T` you
+/// need for that, and *that* is what makes this system work.
 ///
 /// So this, for example, can only be done on types implementing `Unpin`:
 ///
@@ -765,8 +765,8 @@ unsafe impl<T: ?Sized> Freeze for &mut T {}
 /// This trait is automatically implemented for almost every type.
 ///
 /// [`mem::replace`]: ../../std/mem/fn.replace.html
-/// [`Pin<P>`]: ../pin/struct.Pin.html
-/// [`pin module`]: ../../std/pin/index.html
+/// [Pin]: crate::pin::Pin
+/// [`pin module`]: crate::pin
 #[stable(feature = "pin", since = "1.33.0")]
 #[rustc_on_unimplemented(
     on(_Self = "std::future::Future", note = "consider using `Box::pin`",),
diff --git a/library/std/src/os/linux/raw.rs b/library/std/src/os/linux/raw.rs
index eb8589eb58f..1950ffcb21b 100644
--- a/library/std/src/os/linux/raw.rs
+++ b/library/std/src/os/linux/raw.rs
@@ -170,63 +170,63 @@ mod arch {
 
 #[cfg(target_arch = "hexagon")]
 mod arch {
-    use crate::os::raw::{c_int, c_long, c_longlong, c_ulonglong};
+    use crate::os::raw::{c_int, c_long, c_uint};
 
     #[stable(feature = "raw_ext", since = "1.1.0")]
-    pub type blkcnt_t = c_longlong;
+    pub type blkcnt_t = i64;
     #[stable(feature = "raw_ext", since = "1.1.0")]
     pub type blksize_t = c_long;
     #[stable(feature = "raw_ext", since = "1.1.0")]
-    pub type ino_t = c_ulonglong;
+    pub type ino_t = u64;
     #[stable(feature = "raw_ext", since = "1.1.0")]
     pub type nlink_t = c_uint;
     #[stable(feature = "raw_ext", since = "1.1.0")]
-    pub type off_t = c_longlong;
+    pub type off_t = i64;
     #[stable(feature = "raw_ext", since = "1.1.0")]
-    pub type time_t = c_long;
+    pub type time_t = i64;
 
     #[repr(C)]
     #[derive(Clone)]
     #[stable(feature = "raw_ext", since = "1.1.0")]
     pub struct stat {
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_dev: ::dev_t,
+        pub st_dev: u64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_ino: ::c_ulonglong,
+        pub st_ino: u64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_mode: ::c_uint,
+        pub st_mode: u32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_nlink: ::c_uint,
+        pub st_nlink: u32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_uid: ::c_uint,
+        pub st_uid: u32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_gid: ::c_uint,
+        pub st_gid: u32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_rdev: ::c_ulonglong,
+        pub st_rdev: u64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub __pad1: ::c_ulong,
+        pub __pad1: u32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_size: ::c_longlong,
+        pub st_size: i64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_blksize: ::blksize_t,
+        pub st_blksize: i32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub __pad2: ::c_int,
+        pub __pad2: i32,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_blocks: ::blkcnt_t,
+        pub st_blocks: i64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_atime: ::time_t,
+        pub st_atime: i64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_atime_nsec: ::c_long,
+        pub st_atime_nsec: c_long,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_mtime: ::time_t,
+        pub st_mtime: i64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_mtime_nsec: ::c_long,
+        pub st_mtime_nsec: c_long,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_ctime: ::time_t,
+        pub st_ctime: i64,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub st_ctime_nsec: ::c_long,
+        pub st_ctime_nsec: c_long,
         #[stable(feature = "raw_ext", since = "1.1.0")]
-        pub __pad3: [::c_int; 2],
+        pub __pad3: [c_int; 2],
     }
 }
 
diff --git a/library/std/src/sys/vxworks/fd.rs b/library/std/src/sys/vxworks/fd.rs
index ea186846929..d58468ad539 100644
--- a/library/std/src/sys/vxworks/fd.rs
+++ b/library/std/src/sys/vxworks/fd.rs
@@ -53,7 +53,7 @@ impl FileDesc {
     }
 
     #[inline]
-    fn is_read_vectored(&self) -> bool {
+    pub fn is_read_vectored(&self) -> bool {
         true
     }
 
diff --git a/library/std/src/sys/vxworks/process/process_common.rs b/library/std/src/sys/vxworks/process/process_common.rs
index bbbd5eda773..6473a0c3cec 100644
--- a/library/std/src/sys/vxworks/process/process_common.rs
+++ b/library/std/src/sys/vxworks/process/process_common.rs
@@ -351,8 +351,7 @@ impl ExitStatus {
     }
 
     fn exited(&self) -> bool {
-        /*unsafe*/
-        { libc::WIFEXITED(self.0) }
+        libc::WIFEXITED(self.0)
     }
 
     pub fn success(&self) -> bool {
@@ -360,19 +359,11 @@ impl ExitStatus {
     }
 
     pub fn code(&self) -> Option<i32> {
-        if self.exited() {
-            Some(/*unsafe*/ { libc::WEXITSTATUS(self.0) })
-        } else {
-            None
-        }
+        if self.exited() { Some(libc::WEXITSTATUS(self.0)) } else { None }
     }
 
     pub fn signal(&self) -> Option<i32> {
-        if !self.exited() {
-            Some(/*unsafe*/ { libc::WTERMSIG(self.0) })
-        } else {
-            None
-        }
+        if !self.exited() { Some(libc::WTERMSIG(self.0)) } else { None }
     }
 }
 
diff --git a/library/std/src/sys/vxworks/thread_local_dtor.rs b/library/std/src/sys/vxworks/thread_local_dtor.rs
index 3f73f6c4903..5391ed83ebc 100644
--- a/library/std/src/sys/vxworks/thread_local_dtor.rs
+++ b/library/std/src/sys/vxworks/thread_local_dtor.rs
@@ -2,6 +2,6 @@
 #![unstable(feature = "thread_local_internals", issue = "none")]
 
 pub unsafe fn register_dtor(t: *mut u8, dtor: unsafe extern "C" fn(*mut u8)) {
-    use crate::sys_common::thread_local::register_dtor_fallback;
+    use crate::sys_common::thread_local_dtor::register_dtor_fallback;
     register_dtor_fallback(t, dtor);
 }
diff --git a/library/std/src/time.rs b/library/std/src/time.rs
index 02161ecb4c8..c8aee1da39b 100644
--- a/library/std/src/time.rs
+++ b/library/std/src/time.rs
@@ -159,7 +159,7 @@ pub struct Instant(time::Instant);
 /// | DARWIN    | [gettimeofday]                                                       |
 /// | VXWorks   | [clock_gettime (Realtime Clock)]                                     |
 /// | WASI      | [__wasi_clock_time_get (Realtime Clock)]                             |
-/// | Windows   | [GetSystemTimeAsFileTime]                                            |
+/// | Windows   | [GetSystemTimePreciseAsFileTime] / [GetSystemTimeAsFileTime]         |
 ///
 /// [clock_time_get (Realtime Clock)]: https://nuxi.nl/cloudabi/#clock_time_get
 /// [`insecure_time` usercall]: https://edp.fortanix.com/docs/api/fortanix_sgx_abi/struct.Usercalls.html#method.insecure_time
@@ -167,6 +167,7 @@ pub struct Instant(time::Instant);
 /// [gettimeofday]: http://man7.org/linux/man-pages/man2/gettimeofday.2.html
 /// [clock_gettime (Realtime Clock)]: https://linux.die.net/man/3/clock_gettime
 /// [__wasi_clock_time_get (Realtime Clock)]: https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/docs.md#clock_time_get
+/// [GetSystemTimePreciseAsFileTime]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemtimepreciseasfiletime
 /// [GetSystemTimeAsFileTime]: https://docs.microsoft.com/en-us/windows/win32/api/sysinfoapi/nf-sysinfoapi-getsystemtimeasfiletime
 ///
 /// **Disclaimer:** These system calls might change over time.
diff --git a/src/bootstrap/cc_detect.rs b/src/bootstrap/cc_detect.rs
index 7ff00d85dd2..d50e4cf5269 100644
--- a/src/bootstrap/cc_detect.rs
+++ b/src/bootstrap/cc_detect.rs
@@ -132,7 +132,8 @@ pub fn find(build: &mut Build) {
             false
         };
 
-        if cxx_configured {
+        // for VxWorks, record CXX compiler which will be used in lib.rs:linker()
+        if cxx_configured || target.contains("vxworks") {
             let compiler = cfg.get_compiler();
             build.cxx.insert(target, compiler);
         }
diff --git a/src/bootstrap/lib.rs b/src/bootstrap/lib.rs
index a42ee11bd6f..191cc5b0b64 100644
--- a/src/bootstrap/lib.rs
+++ b/src/bootstrap/lib.rs
@@ -854,6 +854,10 @@ impl Build {
         if let Some(linker) = self.config.target_config.get(&target).and_then(|c| c.linker.as_ref())
         {
             Some(linker)
+        } else if target.contains("vxworks") {
+            // need to use CXX compiler as linker to resolve the exception functions
+            // that are only existed in CXX libraries
+            Some(self.cxx[&target].path())
         } else if target != self.config.build
             && util::use_host_linker(target)
             && !target.contains("msvc")
diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 462a696dee6..57c8d5bff76 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -1576,14 +1576,21 @@ function defocusSearchBar() {
         }
 
         function showResults(results) {
-            if (results.others.length === 1 &&
-                getCurrentValue("rustdoc-go-to-only-result") === "true") {
+            var search = getSearchElement();
+            if (results.others.length === 1
+                && getCurrentValue("rustdoc-go-to-only-result") === "true"
+                // By default, the search DOM element is "empty" (meaning it has no children not
+                // text content). Once a search has been run, it won't be empty, even if you press
+                // ESC or empty the search input (which also "cancels" the search).
+                && (!search.firstChild || search.firstChild.innerText !== getSearchLoadingText()))
+            {
                 var elem = document.createElement("a");
                 elem.href = results.others[0].href;
                 elem.style.display = "none";
                 // For firefox, we need the element to be in the DOM so it can be clicked.
                 document.body.appendChild(elem);
                 elem.click();
+                return;
             }
             var query = getQuery(search_input.value);
 
@@ -1602,7 +1609,6 @@ function defocusSearchBar() {
                 "</div><div id=\"results\">" +
                 ret_others[0] + ret_in_args[0] + ret_returned[0] + "</div>";
 
-            var search = getSearchElement();
             search.innerHTML = output;
             showSearchResults(search);
             var tds = search.getElementsByTagName("td");
@@ -2679,6 +2685,10 @@ function defocusSearchBar() {
         }
     }
 
+    function getSearchLoadingText() {
+        return "Loading search results...";
+    }
+
     if (search_input) {
         search_input.onfocus = function() {
             putBackSearch(this);
@@ -2688,7 +2698,7 @@ function defocusSearchBar() {
     var params = getQueryStringParams();
     if (params && params.search) {
         var search = getSearchElement();
-        search.innerHTML = "<h3 style=\"text-align: center;\">Loading search results...</h3>";
+        search.innerHTML = "<h3 style=\"text-align: center;\">" + getSearchLoadingText() + "</h3>";
         showSearchResults(search);
     }
 
diff --git a/src/librustdoc/html/static/themes/ayu.css b/src/librustdoc/html/static/themes/ayu.css
index 6e8db1e9eb7..f7d474b5562 100644
--- a/src/librustdoc/html/static/themes/ayu.css
+++ b/src/librustdoc/html/static/themes/ayu.css
@@ -495,6 +495,7 @@ kbd {
 #theme-picker, #settings-menu, .help-button {
 	border-color: #5c6773;
 	background-color: #0f1419;
+	color: #fff;
 }
 
 #theme-picker > img, #settings-menu > img {
@@ -513,7 +514,7 @@ kbd {
 }
 
 #theme-choices > button:not(:first-child) {
-	border-top-color: #c5c5c5;
+	border-top-color: #5c6773;
 }
 
 #theme-choices > button:hover, #theme-choices > button:focus {
diff --git a/src/librustdoc/html/static/themes/dark.css b/src/librustdoc/html/static/themes/dark.css
index eeb1f0a3d4a..f5a85337768 100644
--- a/src/librustdoc/html/static/themes/dark.css
+++ b/src/librustdoc/html/static/themes/dark.css
@@ -389,6 +389,7 @@ kbd {
 #theme-picker, #settings-menu, .help-button {
 	border-color: #e0e0e0;
 	background: #f0f0f0;
+	color: #000;
 }
 
 #theme-picker:hover, #theme-picker:focus,
diff --git a/src/librustdoc/passes/doc_test_lints.rs b/src/librustdoc/passes/doc_test_lints.rs
index a465a5f681f..367f93cfd38 100644
--- a/src/librustdoc/passes/doc_test_lints.rs
+++ b/src/librustdoc/passes/doc_test_lints.rs
@@ -1,7 +1,7 @@
 //! This pass is overloaded and runs two different lints.
 //!
-//! - MISSING_DOC_CODE_EXAMPLES: this looks for public items missing doc-tests
-//! - PRIVATE_DOC_TESTS: this looks for private items with doc-tests.
+//! - MISSING_DOC_CODE_EXAMPLES: this lint is **UNSTABLE** and looks for public items missing doc-tests
+//! - PRIVATE_DOC_TESTS: this lint is **STABLE** and looks for private items with doc-tests.
 
 use super::{span_of_attrs, Pass};
 use crate::clean;
@@ -89,7 +89,9 @@ pub fn look_for_tests<'tcx>(cx: &DocContext<'tcx>, dox: &str, item: &Item) {
 
     find_testable_code(&dox, &mut tests, ErrorCodes::No, false, None);
 
-    if tests.found_tests == 0 {
+    if tests.found_tests == 0
+        && rustc_feature::UnstableFeatures::from_environment().is_nightly_build()
+    {
         if should_have_doc_example(&item.inner) {
             debug!("reporting error for {:?} (hir_id={:?})", item, hir_id);
             let sp = span_of_attrs(&item.attrs).unwrap_or(item.source.span());
@@ -100,9 +102,7 @@ pub fn look_for_tests<'tcx>(cx: &DocContext<'tcx>, dox: &str, item: &Item) {
                 |lint| lint.build("missing code example in this documentation").emit(),
             );
         }
-    } else if rustc_feature::UnstableFeatures::from_environment().is_nightly_build()
-        && tests.found_tests > 0
-        && !cx.renderinfo.borrow().access_levels.is_public(item.def_id)
+    } else if tests.found_tests > 0 && !cx.renderinfo.borrow().access_levels.is_public(item.def_id)
     {
         cx.tcx.struct_span_lint_hir(
             lint::builtin::PRIVATE_DOC_TESTS,
diff --git a/src/tools/publish_toolstate.py b/src/tools/publish_toolstate.py
index 51416c8ce63..9cfde0c232b 100755
--- a/src/tools/publish_toolstate.py
+++ b/src/tools/publish_toolstate.py
@@ -275,7 +275,12 @@ def update_latest(
         return message
 
 
-def main():
+# Warning: Do not try to add a function containing the body of this try block.
+# There are variables declared within that are implicitly global; it is unknown
+# which ones precisely but at least this is true for `github_token`.
+try:
+    if __name__ != '__main__':
+        exit(0)
     repo = os.environ.get('TOOLSTATE_VALIDATE_MAINTAINERS_REPO')
     if repo:
         github_token = os.environ.get('TOOLSTATE_REPO_ACCESS_TOKEN')
@@ -342,11 +347,6 @@ def main():
         }
     ))
     response.read()
-
-
-if __name__ == '__main__':
-    try:
-        main()
-    except urllib2.HTTPError as e:
-        print("HTTPError: %s\n%s" % (e, e.read()))
-        raise
+except urllib2.HTTPError as e:
+    print("HTTPError: %s\n%s" % (e, e.read()))
+    raise