Rollup of 7 pull requests

compiler/rustc_typeck/src/check/method/suggest.rs

@@ -1195,11 +1195,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
     fn suggest_derive(
         &self,
         err: &mut DiagnosticBuilder<'_>,
-        unsatisfied_predicates: &Vec<(
+        unsatisfied_predicates: &[(
             ty::Predicate<'tcx>,
             Option<ty::Predicate<'tcx>>,
             Option<ObligationCause<'tcx>>,
-        )>,
+        )],
     ) {
         let mut derives = Vec::<(String, Span, String)>::new();
         let mut traits = Vec::<Span>::new();
@@ -1236,23 +1236,24 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 traits.push(self.tcx.def_span(trait_pred.def_id()));
             }
         }
-        derives.sort();
-        let derives_grouped = derives.into_iter().fold(
-            Vec::<(String, Span, String)>::new(),
-            |mut acc, (self_name, self_span, trait_name)| {
-                if let Some((acc_self_name, _, ref mut traits)) = acc.last_mut() {
-                    if acc_self_name == &self_name {
-                        traits.push_str(format!(", {}", trait_name).as_str());
-                        return acc;
-                    }
-                }
-                acc.push((self_name, self_span, trait_name));
-                acc
-            },
-        );
         traits.sort();
         traits.dedup();
 
+        derives.sort();
+        derives.dedup();
+
+        let mut derives_grouped = Vec::<(String, Span, String)>::new();
+        for (self_name, self_span, trait_name) in derives.into_iter() {
+            if let Some((last_self_name, _, ref mut last_trait_names)) = derives_grouped.last_mut()
+            {
+                if last_self_name == &self_name {
+                    last_trait_names.push_str(format!(", {}", trait_name).as_str());
+                    continue;
+                }
+            }
+            derives_grouped.push((self_name, self_span, trait_name));
+        }
+
         let len = traits.len();
         if len > 0 {
             let span: MultiSpan = traits.into();

library/alloc/tests/str.rs

@@ -1183,6 +1183,37 @@ fn test_rev_iterator() {
     assert_eq!(pos, v.len());
 }
 
+#[test]
+fn test_to_lowercase_rev_iterator() {
+    let s = "AÖßÜ💩ΣΤΙΓΜΑΣDžfiİ";
+    let v = ['\u{307}', 'i', 'fi', 'dž', 'σ', 'α', 'μ', 'γ', 'ι', 'τ', 'σ', '💩', 'ü', 'ß', 'ö', 'a'];
+
+    let mut pos = 0;
+    let it = s.chars().flat_map(|c| c.to_lowercase()).rev();
+
+    for c in it {
+        assert_eq!(c, v[pos]);
+        pos += 1;
+    }
+    assert_eq!(pos, v.len());
+}
+
+#[test]
+fn test_to_uppercase_rev_iterator() {
+    let s = "aößü💩στιγμαςDžfiᾀ";
+    let v =
+        ['Ι', 'Ἀ', 'I', 'F', 'DŽ', 'Σ', 'Α', 'Μ', 'Γ', 'Ι', 'Τ', 'Σ', '💩', 'Ü', 'S', 'S', 'Ö', 'A'];
+
+    let mut pos = 0;
+    let it = s.chars().flat_map(|c| c.to_uppercase()).rev();
+
+    for c in it {
+        assert_eq!(c, v[pos]);
+        pos += 1;
+    }
+    assert_eq!(pos, v.len());
+}
+
 #[test]
 #[cfg_attr(miri, ignore)] // Miri is too slow
 fn test_chars_decoding() {

library/core/src/char/mod.rs

@@ -393,6 +393,13 @@ impl Iterator for ToLowercase {
     }
 }
 
+#[stable(feature = "case_mapping_double_ended", since = "1.59.0")]
+impl DoubleEndedIterator for ToLowercase {
+    fn next_back(&mut self) -> Option<char> {
+        self.0.next_back()
+    }
+}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl FusedIterator for ToLowercase {}
 
@@ -420,6 +427,13 @@ impl Iterator for ToUppercase {
     }
 }
 
+#[stable(feature = "case_mapping_double_ended", since = "1.59.0")]
+impl DoubleEndedIterator for ToUppercase {
+    fn next_back(&mut self) -> Option<char> {
+        self.0.next_back()
+    }
+}
+
 #[stable(feature = "fused", since = "1.26.0")]
 impl FusedIterator for ToUppercase {}
 
@@ -479,6 +493,26 @@ impl Iterator for CaseMappingIter {
     }
 }
 
+impl DoubleEndedIterator for CaseMappingIter {
+    fn next_back(&mut self) -> Option<char> {
+        match *self {
+            CaseMappingIter::Three(a, b, c) => {
+                *self = CaseMappingIter::Two(a, b);
+                Some(c)
+            }
+            CaseMappingIter::Two(b, c) => {
+                *self = CaseMappingIter::One(b);
+                Some(c)
+            }
+            CaseMappingIter::One(c) => {
+                *self = CaseMappingIter::Zero;
+                Some(c)
+            }
+            CaseMappingIter::Zero => None,
+        }
+    }
+}
+
 impl fmt::Display for CaseMappingIter {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match *self {

library/core/tests/char.rs

@@ -103,6 +103,9 @@ fn test_to_lowercase() {
         let iter: String = c.to_lowercase().collect();
         let disp: String = c.to_lowercase().to_string();
         assert_eq!(iter, disp);
+        let iter_rev: String = c.to_lowercase().rev().collect();
+        let disp_rev: String = disp.chars().rev().collect();
+        assert_eq!(iter_rev, disp_rev);
         iter
     }
     assert_eq!(lower('A'), "a");
@@ -130,6 +133,9 @@ fn test_to_uppercase() {
         let iter: String = c.to_uppercase().collect();
         let disp: String = c.to_uppercase().to_string();
         assert_eq!(iter, disp);
+        let iter_rev: String = c.to_uppercase().rev().collect();
+        let disp_rev: String = disp.chars().rev().collect();
+        assert_eq!(iter_rev, disp_rev);
         iter
     }
     assert_eq!(upper('a'), "A");

library/std/src/backtrace.rs

@@ -99,7 +99,7 @@ use crate::cell::UnsafeCell;
 use crate::env;
 use crate::ffi::c_void;
 use crate::fmt;
-use crate::sync::atomic::{AtomicUsize, Ordering::SeqCst};
+use crate::sync::atomic::{AtomicUsize, Ordering::Relaxed};
 use crate::sync::Once;
 use crate::sys_common::backtrace::{lock, output_filename};
 use crate::vec::Vec;
@@ -256,7 +256,7 @@ impl Backtrace {
         // backtrace captures speedy, because otherwise reading environment
         // variables every time can be somewhat slow.
         static ENABLED: AtomicUsize = AtomicUsize::new(0);
-        match ENABLED.load(SeqCst) {
+        match ENABLED.load(Relaxed) {
             0 => {}
             1 => return false,
             _ => return true,
@@ -268,7 +268,7 @@ impl Backtrace {
                 Err(_) => false,
             },
         };
-        ENABLED.store(enabled as usize + 1, SeqCst);
+        ENABLED.store(enabled as usize + 1, Relaxed);
         enabled
     }
 

library/std/src/process/tests.rs

@@ -420,3 +420,22 @@ fn env_empty() {
     let p = Command::new("cmd").args(&["/C", "exit 0"]).env_clear().spawn();
     assert!(p.is_ok());
 }
+
+// See issue #91991
+#[test]
+#[cfg(windows)]
+fn run_bat_script() {
+    let tempdir = crate::sys_common::io::test::tmpdir();
+    let script_path = tempdir.join("hello.cmd");
+
+    crate::fs::write(&script_path, "@echo Hello, %~1!").unwrap();
+    let output = Command::new(&script_path)
+        .arg("fellow Rustaceans")
+        .stdout(crate::process::Stdio::piped())
+        .spawn()
+        .unwrap()
+        .wait_with_output()
+        .unwrap();
+    assert!(output.status.success());
+    assert_eq!(String::from_utf8_lossy(&output.stdout).trim(), "Hello, fellow Rustaceans!");
+}

library/std/src/sys/solid/fs.rs

@@ -2,7 +2,7 @@ use super::{abi, error};
 use crate::{
     ffi::{CStr, CString, OsStr, OsString},
     fmt,
-    io::{self, IoSlice, IoSliceMut, SeekFrom},
+    io::{self, IoSlice, IoSliceMut, ReadBuf, SeekFrom},
     mem::MaybeUninit,
     os::raw::{c_int, c_short},
     os::solid::ffi::OsStrExt,
@@ -339,6 +339,32 @@ impl File {
         }
     }
 
+    pub fn read_buf(&self, buf: &mut ReadBuf<'_>) -> io::Result<()> {
+        unsafe {
+            let len = buf.remaining();
+            let mut out_num_bytes = MaybeUninit::uninit();
+            error::SolidError::err_if_negative(abi::SOLID_FS_Read(
+                self.fd.raw(),
+                buf.unfilled_mut().as_mut_ptr() as *mut u8,
+                len,
+                out_num_bytes.as_mut_ptr(),
+            ))
+            .map_err(|e| e.as_io_error())?;
+
+            // Safety: `out_num_bytes` is filled by the successful call to
+            // `SOLID_FS_Read`
+            let num_bytes_read = out_num_bytes.assume_init();
+
+            // Safety: `num_bytes_read` bytes were written to the unfilled
+            // portion of the buffer
+            buf.assume_init(num_bytes_read);
+
+            buf.add_filled(num_bytes_read);
+
+            Ok(())
+        }
+    }
+
     pub fn read_vectored(&self, bufs: &mut [IoSliceMut<'_>]) -> io::Result<usize> {
         crate::io::default_read_vectored(|buf| self.read(buf), bufs)
     }

library/std/src/sys/windows/process.rs

@@ -704,6 +704,19 @@ fn make_command_line(prog: &OsStr, args: &[Arg], force_quotes: bool) -> io::Resu
     // Encode the command and arguments in a command line string such
     // that the spawned process may recover them using CommandLineToArgvW.
     let mut cmd: Vec<u16> = Vec::new();
+
+    // CreateFileW has special handling for .bat and .cmd files, which means we
+    // need to add an extra pair of quotes surrounding the whole command line
+    // so they are properly passed on to the script.
+    // See issue #91991.
+    let is_batch_file = Path::new(prog)
+        .extension()
+        .map(|ext| ext.eq_ignore_ascii_case("cmd") || ext.eq_ignore_ascii_case("bat"))
+        .unwrap_or(false);
+    if is_batch_file {
+        cmd.push(b'"' as u16);
+    }
+
     // Always quote the program name so CreateProcess doesn't interpret args as
     // part of the name if the binary wasn't found first time.
     append_arg(&mut cmd, prog, Quote::Always)?;
@@ -715,6 +728,9 @@ fn make_command_line(prog: &OsStr, args: &[Arg], force_quotes: bool) -> io::Resu
         };
         append_arg(&mut cmd, arg, quote)?;
     }
+    if is_batch_file {
+        cmd.push(b'"' as u16);
+    }
     return Ok(cmd);
 
     fn append_arg(cmd: &mut Vec<u16>, arg: &OsStr, quote: Quote) -> io::Result<()> {

src/librustdoc/config.rs

@@ -272,7 +272,10 @@ crate struct RenderOptions {
     crate emit: Vec<EmitType>,
     /// If `true`, HTML source pages will generate links for items to their definition.
     crate generate_link_to_definition: bool,
+    /// Set of function-call locations to include as examples
     crate call_locations: AllCallLocations,
+    /// If `true`, Context::init will not emit shared files.
+    crate no_emit_shared: bool,
 }
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
@@ -732,6 +735,7 @@ impl Options {
                 emit,
                 generate_link_to_definition,
                 call_locations,
+                no_emit_shared: false,
             },
             crate_name,
             output_format,

src/librustdoc/html/render/context.rs

@@ -397,6 +397,7 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             show_type_layout,
             generate_link_to_definition,
             call_locations,
+            no_emit_shared,
             ..
         } = options;
 
@@ -516,13 +517,16 @@ impl<'tcx> FormatRenderer<'tcx> for Context<'tcx> {
             sources::render(&mut cx, &krate)?;
         }
 
-        // Build our search index
-        let index = build_index(&krate, &mut Rc::get_mut(&mut cx.shared).unwrap().cache, tcx);
+        if !no_emit_shared {
+            // Build our search index
+            let index = build_index(&krate, &mut Rc::get_mut(&mut cx.shared).unwrap().cache, tcx);
+
+            // Write shared runs within a flock; disable thread dispatching of IO temporarily.
+            Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(true);
+            write_shared(&cx, &krate, index, &md_opts)?;
+            Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(false);
+        }
 
-        // Write shared runs within a flock; disable thread dispatching of IO temporarily.
-        Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(true);
-        write_shared(&cx, &krate, index, &md_opts)?;
-        Rc::get_mut(&mut cx.shared).unwrap().fs.set_sync_only(false);
         Ok((cx, krate))
     }
 

src/librustdoc/html/static/js/README.md

@@ -0,0 +1,15 @@
+# Rustdoc JS
+
+These JavaScript files are incorporated into the rustdoc binary at build time,
+and are minified and written to the filesystem as part of the doc build process.
+
+We use the [Closure Compiler](https://github.com/google/closure-compiler/wiki/Annotating-JavaScript-for-the-Closure-Compiler)
+dialect of JSDoc to comment our code and annotate params and return types.
+To run a check:
+
+    ./x.py doc library/std
+    npm i -g google-closure-compiler
+    google-closure-compiler -W VERBOSE \
+      build/<YOUR PLATFORM>/doc/{search-index*.js,crates*.js} \
+      src/librustdoc/html/static/js/{search.js,main.js,storage.js} \
+      --externs src/librustdoc/html/static/js/externs.js >/dev/null

src/librustdoc/html/static/js/externs.js

@@ -0,0 +1,32 @@
+// This file contains type definitions that are processed by the Closure Compiler but are
+// not put into the JavaScript we include as part of the documentation. It is used for
+// type checking. See README.md in this directory for more info.
+
+/* eslint-disable */
+var searchState;
+function initSearch(searchIndex){}
+
+/**
+ * @typedef {{
+ *   raw: string,
+ *   query: string,
+ *   type: string,
+ *   id: string,
+ * }}
+ */
+var ParsedQuery;
+
+/**
+ * @typedef {{
+ *    crate: string,
+ *    desc: string,
+ *    id: number,
+ *    name: string,
+ *    normalizedName: string,
+ *    parent: (Object|null|undefined),
+ *    path: string,
+ *    ty: (Number|null|number),
+ *    type: (Array<?>|null)
+ * }}
+ */
+var Row;