Auto merge of #87068 - JohnTitor:rollup-2xuisfx, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - #73936 (Rustdoc: Change all 'optflag' arguments to 'optflagmulti')
 - #86926 (Update regex crates)
 - #86951 ([docs] Clarify behaviour of f64 and f32::sqrt when argument is negative zero)
 - #87031 (Update reference.md)
 - #87037 (cleanup(rustdoc): remove unused function getObjectNameById)
 - #87045 (Fix tracking issue for `bool_to_option`)
 - #87049 (Account for `submodules = false` in config.toml when updating LLVM submodule)
 - #87061 (Do not suggest adding a semicolon after `?`)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

12 files changed, 118 insertions, 49 deletions

diff --git a/Cargo.lock b/Cargo.lock
index f8f13315794..b432f9ae227 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3044,31 +3044,29 @@ dependencies = [
 
 [[package]]
 name = "regex"
-version = "1.4.3"
+version = "1.4.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9251239e129e16308e70d853559389de218ac275b515068abc96829d05b948a"
+checksum = "2a26af418b574bd56588335b3a3659a65725d4e636eb1016c2f9e3b38c7cc759"
 dependencies = [
  "aho-corasick",
  "memchr",
  "regex-syntax",
- "thread_local",
 ]
 
 [[package]]
 name = "regex-automata"
-version = "0.1.9"
+version = "0.1.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae1ded71d66a4a97f5e961fd0cb25a5f366a42a41570d16a763a69c092c26ae4"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
 dependencies = [
- "byteorder",
  "regex-syntax",
 ]
 
 [[package]]
 name = "regex-syntax"
-version = "0.6.22"
+version = "0.6.25"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b5eb417147ba9860a96cfe72a0b93bf88fee1744b5636ec99ab20c1aa9376581"
+checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 
 [[package]]
 name = "remote-test-client"
diff --git a/compiler/rustc_typeck/src/check/coercion.rs b/compiler/rustc_typeck/src/check/coercion.rs
index afa4d0f1c4d..9e89804b747 100644
--- a/compiler/rustc_typeck/src/check/coercion.rs
+++ b/compiler/rustc_typeck/src/check/coercion.rs
@@ -1456,11 +1456,15 @@ impl<'tcx, 'exprs, E: AsCoercionSite> CoerceMany<'tcx, 'exprs, E> {
                 expected.is_unit(),
                 pointing_at_return_type,
             ) {
-                // If the block is from an external macro, then do not suggest
-                // adding a semicolon, because there's nowhere to put it.
-                // See issue #81943.
+                // If the block is from an external macro or try (`?`) desugaring, then
+                // do not suggest adding a semicolon, because there's nowhere to put it.
+                // See issues #81943 and #87051.
                 if cond_expr.span.desugaring_kind().is_none()
                     && !in_external_macro(fcx.tcx.sess, cond_expr.span)
+                    && !matches!(
+                        cond_expr.kind,
+                        hir::ExprKind::Match(.., hir::MatchSource::TryDesugar)
+                    )
                 {
                     err.span_label(cond_expr.span, "expected this to be `()`");
                     if expr.can_have_side_effects() {
diff --git a/library/core/src/bool.rs b/library/core/src/bool.rs
index 00164c631b3..dcafaae2f5b 100644
--- a/library/core/src/bool.rs
+++ b/library/core/src/bool.rs
@@ -12,7 +12,7 @@ impl bool {
     /// assert_eq!(false.then_some(0), None);
     /// assert_eq!(true.then_some(0), Some(0));
     /// ```
-    #[unstable(feature = "bool_to_option", issue = "64260")]
+    #[unstable(feature = "bool_to_option", issue = "80967")]
     #[inline]
     pub fn then_some<T>(self, t: T) -> Option<T> {
         if self { Some(t) } else { None }
diff --git a/library/std/src/f32.rs b/library/std/src/f32.rs
index 21bd79611a5..e0cc6ad1d42 100644
--- a/library/std/src/f32.rs
+++ b/library/std/src/f32.rs
@@ -324,18 +324,20 @@ impl f32 {
 
     /// Returns the square root of a number.
     ///
-    /// Returns NaN if `self` is a negative number.
+    /// Returns NaN if `self` is a negative number other than `-0.0`.
     ///
     /// # Examples
     ///
     /// ```
     /// let positive = 4.0_f32;
     /// let negative = -4.0_f32;
+    /// let negative_zero = -0.0_f32;
     ///
     /// let abs_difference = (positive.sqrt() - 2.0).abs();
     ///
     /// assert!(abs_difference <= f32::EPSILON);
     /// assert!(negative.sqrt().is_nan());
+    /// assert!(negative_zero.sqrt() == negative_zero);
     /// ```
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/library/std/src/f64.rs b/library/std/src/f64.rs
index 8c8cf73741b..7ed65b7dafe 100644
--- a/library/std/src/f64.rs
+++ b/library/std/src/f64.rs
@@ -324,18 +324,20 @@ impl f64 {
 
     /// Returns the square root of a number.
     ///
-    /// Returns NaN if `self` is a negative number.
+    /// Returns NaN if `self` is a negative number other than `-0.0`.
     ///
     /// # Examples
     ///
     /// ```
     /// let positive = 4.0_f64;
     /// let negative = -4.0_f64;
+    /// let negative_zero = -0.0_f64;
     ///
     /// let abs_difference = (positive.sqrt() - 2.0).abs();
     ///
     /// assert!(abs_difference < 1e-10);
     /// assert!(negative.sqrt().is_nan());
+    /// assert!(negative_zero.sqrt() == negative_zero);
     /// ```
     #[must_use = "method returns a new number and does not mutate the original value"]
     #[stable(feature = "rust1", since = "1.0.0")]
diff --git a/src/bootstrap/native.rs b/src/bootstrap/native.rs
index b967b6dbd2d..0be42d9b234 100644
--- a/src/bootstrap/native.rs
+++ b/src/bootstrap/native.rs
@@ -99,6 +99,10 @@ pub(crate) fn update_llvm_submodule(build: &Build) {
         t!(std::fs::read_dir(dir)).next().is_none()
     }
 
+    if !build.config.submodules {
+        return;
+    }
+
     // NOTE: The check for the empty directory is here because when running x.py
     // the first time, the llvm submodule won't be checked out. Check it out
     // now so we can build it.
diff --git a/src/doc/reference.md b/src/doc/reference.md
index fdeea17ed11..5e09cdc5cf5 100644
--- a/src/doc/reference.md
+++ b/src/doc/reference.md
@@ -1,4 +1,4 @@
 % The Rust Reference has moved
 
 We've split up the reference into chapters. Please find it at its new
-home [here](reference/index.html).
+home [here](https://doc.rust-lang.org/stable/reference/introduction.html).
diff --git a/src/librustdoc/html/static/js/search.js b/src/librustdoc/html/static/js/search.js
index a7fc0b831f4..76e7295bce3 100644
--- a/src/librustdoc/html/static/js/search.js
+++ b/src/librustdoc/html/static/js/search.js
@@ -289,13 +289,6 @@ window.initSearch = function(rawSearchIndex) {
             };
         }
 
-        function getObjectNameFromId(id) {
-            if (typeof id === "number") {
-                return searchIndex[id].name;
-            }
-            return id;
-        }
-
         function checkGenerics(obj, val) {
             // The names match, but we need to be sure that all generics kinda
             // match as well.
@@ -306,10 +299,10 @@ window.initSearch = function(rawSearchIndex) {
                     var elems = Object.create(null);
                     var elength = obj[GENERICS_DATA].length;
                     for (var x = 0; x < elength; ++x) {
-                        if (!elems[getObjectNameFromId(obj[GENERICS_DATA][x])]) {
-                            elems[getObjectNameFromId(obj[GENERICS_DATA][x])] = 0;
+                        if (!elems[obj[GENERICS_DATA][x]]) {
+                            elems[obj[GENERICS_DATA][x]] = 0;
                         }
-                        elems[getObjectNameFromId(obj[GENERICS_DATA][x])] += 1;
+                        elems[obj[GENERICS_DATA][x]] += 1;
                     }
                     var total = 0;
                     var done = 0;
@@ -318,7 +311,7 @@ window.initSearch = function(rawSearchIndex) {
                     var vlength = val.generics.length;
                     for (x = 0; x < vlength; ++x) {
                         var lev = MAX_LEV_DISTANCE + 1;
-                        var firstGeneric = getObjectNameFromId(val.generics[x]);
+                        var firstGeneric = val.generics[x];
                         var match = null;
                         if (elems[firstGeneric]) {
                             match = firstGeneric;
@@ -361,16 +354,16 @@ window.initSearch = function(rawSearchIndex) {
                             var elems = Object.create(null);
                             len = obj[GENERICS_DATA].length;
                             for (x = 0; x < len; ++x) {
-                                if (!elems[getObjectNameFromId(obj[GENERICS_DATA][x])]) {
-                                    elems[getObjectNameFromId(obj[GENERICS_DATA][x])] = 0;
+                                if (!elems[obj[GENERICS_DATA][x]]) {
+                                    elems[obj[GENERICS_DATA][x]] = 0;
                                 }
-                                elems[getObjectNameFromId(obj[GENERICS_DATA][x])] += 1;
+                                elems[obj[GENERICS_DATA][x]] += 1;
                             }
 
                             var allFound = true;
                             len = val.generics.length;
                             for (x = 0; x < len; ++x) {
-                                firstGeneric = getObjectNameFromId(val.generics[x]);
+                                firstGeneric = val.generics[x];
                                 if (elems[firstGeneric]) {
                                     elems[firstGeneric] -= 1;
                                 } else {
diff --git a/src/librustdoc/lib.rs b/src/librustdoc/lib.rs
index 64a9905b33f..bc635190f42 100644
--- a/src/librustdoc/lib.rs
+++ b/src/librustdoc/lib.rs
@@ -269,9 +269,9 @@ fn opts() -> Vec<RustcOptGroup> {
     let stable: fn(_, fn(&mut getopts::Options) -> &mut _) -> _ = RustcOptGroup::stable;
     let unstable: fn(_, fn(&mut getopts::Options) -> &mut _) -> _ = RustcOptGroup::unstable;
     vec![
-        stable("h", |o| o.optflag("h", "help", "show this help message")),
-        stable("V", |o| o.optflag("V", "version", "print rustdoc's version")),
-        stable("v", |o| o.optflag("v", "verbose", "use verbose output")),
+        stable("h", |o| o.optflagmulti("h", "help", "show this help message")),
+        stable("V", |o| o.optflagmulti("V", "version", "print rustdoc's version")),
+        stable("v", |o| o.optflagmulti("v", "verbose", "use verbose output")),
         stable("r", |o| {
             o.optopt("r", "input-format", "the input type of the specified file", "[rust]")
         }),
@@ -309,14 +309,14 @@ fn opts() -> Vec<RustcOptGroup> {
             )
         }),
         stable("plugins", |o| o.optmulti("", "plugins", "removed", "PLUGINS")),
-        stable("no-default", |o| o.optflag("", "no-defaults", "don't run the default passes")),
+        stable("no-default", |o| o.optflagmulti("", "no-defaults", "don't run the default passes")),
         stable("document-private-items", |o| {
-            o.optflag("", "document-private-items", "document private items")
+            o.optflagmulti("", "document-private-items", "document private items")
         }),
         unstable("document-hidden-items", |o| {
-            o.optflag("", "document-hidden-items", "document items that have doc(hidden)")
+            o.optflagmulti("", "document-hidden-items", "document items that have doc(hidden)")
         }),
-        stable("test", |o| o.optflag("", "test", "run code examples as tests")),
+        stable("test", |o| o.optflagmulti("", "test", "run code examples as tests")),
         stable("test-args", |o| {
             o.optmulti("", "test-args", "arguments to pass to the test runner", "ARGS")
         }),
@@ -386,7 +386,7 @@ fn opts() -> Vec<RustcOptGroup> {
             o.optopt("", "markdown-playground-url", "URL to send code snippets to", "URL")
         }),
         stable("markdown-no-toc", |o| {
-            o.optflag("", "markdown-no-toc", "don't include table of contents")
+            o.optflagmulti("", "markdown-no-toc", "don't include table of contents")
         }),
         stable("e", |o| {
             o.optopt(
@@ -412,13 +412,13 @@ fn opts() -> Vec<RustcOptGroup> {
             )
         }),
         unstable("display-warnings", |o| {
-            o.optflag("", "display-warnings", "to print code warnings when testing doc")
+            o.optflagmulti("", "display-warnings", "to print code warnings when testing doc")
         }),
         stable("crate-version", |o| {
             o.optopt("", "crate-version", "crate version to print into documentation", "VERSION")
         }),
         unstable("sort-modules-by-appearance", |o| {
-            o.optflag(
+            o.optflagmulti(
                 "",
                 "sort-modules-by-appearance",
                 "sort modules by where they appear in the program, rather than alphabetically",
@@ -495,7 +495,7 @@ fn opts() -> Vec<RustcOptGroup> {
             o.optopt("", "json", "Configure the structure of JSON diagnostics", "CONFIG")
         }),
         unstable("disable-minification", |o| {
-            o.optflag("", "disable-minification", "Disable minification applied on JS files")
+            o.optflagmulti("", "disable-minification", "Disable minification applied on JS files")
         }),
         stable("warn", |o| o.optmulti("W", "warn", "Set lint warnings", "OPT")),
         stable("allow", |o| o.optmulti("A", "allow", "Set lint allowed", "OPT")),
@@ -523,7 +523,7 @@ fn opts() -> Vec<RustcOptGroup> {
             o.optopt("", "index-page", "Markdown file to be used as index page", "PATH")
         }),
         unstable("enable-index-page", |o| {
-            o.optflag("", "enable-index-page", "To enable generation of the index page")
+            o.optflagmulti("", "enable-index-page", "To enable generation of the index page")
         }),
         unstable("static-root-path", |o| {
             o.optopt(
@@ -535,7 +535,7 @@ fn opts() -> Vec<RustcOptGroup> {
             )
         }),
         unstable("disable-per-crate-search", |o| {
-            o.optflag(
+            o.optflagmulti(
                 "",
                 "disable-per-crate-search",
                 "disables generating the crate selector on the search box",
@@ -550,14 +550,14 @@ fn opts() -> Vec<RustcOptGroup> {
             )
         }),
         unstable("show-coverage", |o| {
-            o.optflag(
+            o.optflagmulti(
                 "",
                 "show-coverage",
                 "calculate percentage of public items with documentation",
             )
         }),
         unstable("enable-per-target-ignores", |o| {
-            o.optflag(
+            o.optflagmulti(
                 "",
                 "enable-per-target-ignores",
                 "parse ignore-foo for ignoring doctests on a per-target basis",
@@ -582,9 +582,9 @@ fn opts() -> Vec<RustcOptGroup> {
         unstable("test-builder", |o| {
             o.optopt("", "test-builder", "The rustc-like binary to use as the test builder", "PATH")
         }),
-        unstable("check", |o| o.optflag("", "check", "Run rustdoc checks")),
+        unstable("check", |o| o.optflagmulti("", "check", "Run rustdoc checks")),
         unstable("generate-redirect-map", |o| {
-            o.optflag(
+            o.optflagmulti(
                 "",
                 "generate-redirect-map",
                 "Generate JSON file at the top level instead of generating HTML redirection files",
@@ -598,9 +598,11 @@ fn opts() -> Vec<RustcOptGroup> {
                 "[unversioned-shared-resources,toolchain-shared-resources,invocation-specific]",
             )
         }),
-        unstable("no-run", |o| o.optflag("", "no-run", "Compile doctests without running them")),
+        unstable("no-run", |o| {
+            o.optflagmulti("", "no-run", "Compile doctests without running them")
+        }),
         unstable("show-type-layout", |o| {
-            o.optflag("", "show-type-layout", "Include the memory layout of types in the docs")
+            o.optflagmulti("", "show-type-layout", "Include the memory layout of types in the docs")
         }),
     ]
 }
diff --git a/src/test/rustdoc/duplicate-flags.rs b/src/test/rustdoc/duplicate-flags.rs
new file mode 100644
index 00000000000..dde36df2cf5
--- /dev/null
+++ b/src/test/rustdoc/duplicate-flags.rs
@@ -0,0 +1,4 @@
+// compile-flags: --document-private-items --document-private-items
+
+// @has duplicate_flags/struct.Private.html
+struct Private;
diff --git a/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.rs b/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.rs
new file mode 100644
index 00000000000..f882a159f98
--- /dev/null
+++ b/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.rs
@@ -0,0 +1,27 @@
+// Regression test for #87051, where a double semicolon was erroneously
+// suggested after a `?` operator.
+
+fn main() -> Result<(), ()> {
+    a(|| {
+        b()
+        //~^ ERROR: mismatched types [E0308]
+        //~| NOTE: expected `()`, found `i32`
+        //~| HELP: consider using a semicolon here
+    })?;
+
+    // Here, we do want to suggest a semicolon:
+    let x = Ok(42);
+    if true {
+    //~^ NOTE: expected this to be `()`
+        x?
+        //~^ ERROR: mismatched types [E0308]
+        //~| NOTE: expected `()`, found integer
+        //~| HELP: consider using a semicolon here
+    }
+    //~^ HELP: consider using a semicolon here
+
+    Ok(())
+}
+
+fn a<F>(f: F) -> Result<(), ()> where F: FnMut() { Ok(()) }
+fn b() -> i32 { 42 }
diff --git a/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.stderr b/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.stderr
new file mode 100644
index 00000000000..4f7e18742e2
--- /dev/null
+++ b/src/test/ui/suggestions/try-operator-dont-suggest-semicolon.stderr
@@ -0,0 +1,33 @@
+error[E0308]: mismatched types
+  --> $DIR/try-operator-dont-suggest-semicolon.rs:6:9
+   |
+LL |         b()
+   |         ^^^- help: consider using a semicolon here: `;`
+   |         |
+   |         expected `()`, found `i32`
+
+error[E0308]: mismatched types
+  --> $DIR/try-operator-dont-suggest-semicolon.rs:16:9
+   |
+LL | /     if true {
+LL | |
+LL | |         x?
+   | |         ^^ expected `()`, found integer
+LL | |
+LL | |
+LL | |
+LL | |     }
+   | |_____- expected this to be `()`
+   |
+help: consider using a semicolon here
+   |
+LL |         x?;
+   |           ^
+help: consider using a semicolon here
+   |
+LL |     };
+   |      ^
+
+error: aborting due to 2 previous errors
+
+For more information about this error, try `rustc --explain E0308`.