Auto merge of rust-lang#74235 - Manishearth:rollup-bgs3q14, r=Manishe…

…arth

Rollup of 19 pull requests

Successful merges:

 - rust-lang#71322 (Accept tuple.0.0 as tuple indexing (take 2))
 - rust-lang#72303 (Add core::future::{poll_fn, PollFn})
 - rust-lang#73862 (Stabilize casts and coercions to `&[T]` in const fn)
 - rust-lang#73887 (stabilize const mem::forget)
 - rust-lang#73989 (adjust ub-enum test to be endianess-independent)
 - rust-lang#74045 (Explain effects of debugging options from config.toml)
 - rust-lang#74076 (Add `read_exact_at` and `write_all_at` to WASI's `FileExt`)
 - rust-lang#74099 (Add VecDeque::range* methods)
 - rust-lang#74100 (Use str::strip* in bootstrap)
 - rust-lang#74103 (Only add CFGuard on `windows-msvc` targets)
 - rust-lang#74109 (Only allow `repr(i128/u128)` on enum)
 - rust-lang#74122 (Start-up clean-up)
 - rust-lang#74125 (Correctly mark the ending span of a match arm)
 - rust-lang#74127 (Avoid "whitelist")
 - rust-lang#74129 (:arrow_up: rust-analyzer)
 - rust-lang#74135 (Update books)
 - rust-lang#74145 (Update rust-installer to latest version)
 - rust-lang#74161 (Fix  disabled dockerfiles)
 - rust-lang#74162 (take self by value in ToPredicate)

Failed merges:

r? @ghost

Cargo.lock

@@ -1366,8 +1366,8 @@ checksum = "7e81a7c05f79578dbc15793d8b619db9ba32b4577003ef3af1a91c416798c58d"
 name = "installer"
 version = "0.0.0"
 dependencies = [
+ "anyhow",
  "clap",
- "failure",
  "flate2",
  "lazy_static",
  "num_cpus",

config.toml.example

@@ -318,7 +318,9 @@
 #codegen-units-std = 1
 
 # Whether or not debug assertions are enabled for the compiler and standard
-# library.
+# library. Debug assertions control the maximum log level used by rustc. When
+# enabled calls to `trace!` and `debug!` macros are preserved in the compiled
+# binary, otherwise they are omitted.
 #
 # Defaults to rust.debug value
 #debug-assertions = false
@@ -331,7 +333,9 @@
 
 # Debuginfo level for most of Rust code, corresponds to the `-C debuginfo=N` option of `rustc`.
 # `0` - no debug info
-# `1` - line tables only
+# `1` - line tables only - sufficient to generate backtraces that include line
+#       information and inlined functions, set breakpoints at source code
+#       locations, and step through execution in a debugger.
 # `2` - full debug info with variable and type information
 # Can be overridden for specific subsets of Rust code (rustc, std or tools).
 # Debuginfo for tests run with compiletest is not controlled by this option

src/bootstrap/compile.rs

@@ -963,10 +963,11 @@ pub fn run_cargo(
         .collect::<Vec<_>>();
     for (prefix, extension, expected_len) in toplevel {
         let candidates = contents.iter().filter(|&&(_, ref filename, ref meta)| {
-            filename.starts_with(&prefix[..])
-                && filename[prefix.len()..].starts_with('-')
-                && filename.ends_with(&extension[..])
-                && meta.len() == expected_len
+            meta.len() == expected_len
+                && filename
+                    .strip_prefix(&prefix[..])
+                    .map(|s| s.starts_with('-') && s.ends_with(&extension[..]))
+                    .unwrap_or(false)
         });
         let max = candidates
             .max_by_key(|&&(_, _, ref metadata)| FileTime::from_last_modification_time(metadata));

src/bootstrap/doc.rs

@@ -439,8 +439,6 @@ impl Step for Std {
                 builder.cargo(compiler, Mode::Std, SourceType::InTree, target, "rustdoc");
             compile::std_cargo(builder, target, compiler.stage, &mut cargo);
 
-            // Keep a whitelist so we do not build internal stdlib crates, these will be
-            // build by the rustc step later if enabled.
             cargo.arg("-p").arg(package);
             // Create all crate output directories first to make sure rustdoc uses
             // relative links.
@@ -460,6 +458,10 @@ impl Step for Std {
 
             builder.run(&mut cargo.into());
         };
+        // Only build the following crates. While we could just iterate over the
+        // folder structure, that would also build internal crates that we do
+        // not want to show in documentation. These crates will later be visited
+        // by the rustc step, so internal documentation will show them.
         let krates = ["alloc", "core", "std", "proc_macro", "test"];
         for krate in &krates {
             run_cargo_rustdoc_for(krate);

src/bootstrap/lib.rs

@@ -436,10 +436,9 @@ impl Build {
             output(Command::new(&build.initial_rustc).arg("--version").arg("--verbose"));
         let local_release = local_version_verbose
             .lines()
-            .filter(|x| x.starts_with("release:"))
+            .filter_map(|x| x.strip_prefix("release:"))
             .next()
             .unwrap()
-            .trim_start_matches("release:")
             .trim();
         let my_version = channel::CFG_RELEASE_NUM;
         if local_release.split('.').take(2).eq(my_version.split('.').take(2)) {
@@ -1089,10 +1088,10 @@ impl Build {
         let toml_file_name = self.src.join(&format!("src/tools/{}/Cargo.toml", package));
         let toml = t!(fs::read_to_string(&toml_file_name));
         for line in toml.lines() {
-            let prefix = "version = \"";
-            let suffix = "\"";
-            if line.starts_with(prefix) && line.ends_with(suffix) {
-                return line[prefix.len()..line.len() - suffix.len()].to_string();
+            if let Some(stripped) =
+                line.strip_prefix("version = \"").and_then(|s| s.strip_suffix("\""))
+            {
+                return stripped.to_owned();
             }
         }
 

src/ci/docker/host-x86_64/disabled/riscv64gc-linux/Dockerfile

@@ -40,9 +40,9 @@ RUN curl https://cdn.kernel.org/pub/linux/kernel/v5.x/linux-5.6.16.tar.xz | tar
     cp linux.config linux-5.6.16/.config && \
     cd /build/linux-5.6.16 && \
     make olddefconfig && \
-    make -j$(nproc) vmlinux
-RUN cp linux-5.6.16/vmlinux /tmp
-RUN rm -rf linux-5.6.16
+    make -j$(nproc) vmlinux && \
+    cp vmlinux /tmp && \
+    rm -rf linux-5.6.16
 
 # Compile an instance of busybox as this provides a lightweight system and init
 # binary which we will boot into. Only trick here is configuring busybox to

src/ci/docker/run.sh

@@ -119,11 +119,11 @@ elif [ -f "$docker_dir/disabled/$image/Dockerfile" ]; then
         exit 1
     fi
     # Transform changes the context of disabled Dockerfiles to match the enabled ones
-    tar --transform 's#^./disabled/#./#' -C $docker_dir -c . | docker \
+    tar --transform 's#disabled/#./#' -C $script_dir -c . | docker \
       build \
       --rm \
       -t rust-ci \
-      -f "$image/Dockerfile" \
+      -f "host-$(uname -m)/$image/Dockerfile" \
       -
 else
     echo Invalid image: $image

src/etc/test-float-parse/runtests.py

@@ -195,9 +195,9 @@ def main():
     global MAILBOX
     tests = [os.path.splitext(f)[0] for f in glob('*.rs')
                                     if not f.startswith('_')]
-    whitelist = sys.argv[1:]
-    if whitelist:
-        tests = [test for test in tests if test in whitelist]
+    listed = sys.argv[1:]
+    if listed:
+        tests = [test for test in tests if test in listed]
     if not tests:
         print("Error: No tests to run")
         sys.exit(1)
@@ -210,8 +210,6 @@ def main():
     mailman.daemon = True
     mailman.start()
     for test in tests:
-        if whitelist and test not in whitelist:
-            continue
         run(test)
     MAILBOX.put(None)
     mailman.join()

src/liballoc/collections/vec_deque.rs

@@ -1084,6 +1084,108 @@ impl<T> VecDeque<T> {
         self.tail == self.head
     }
 
+    fn range_start_end<R>(&self, range: R) -> (usize, usize)
+    where
+        R: RangeBounds<usize>,
+    {
+        let len = self.len();
+        let start = match range.start_bound() {
+            Included(&n) => n,
+            Excluded(&n) => n + 1,
+            Unbounded => 0,
+        };
+        let end = match range.end_bound() {
+            Included(&n) => n + 1,
+            Excluded(&n) => n,
+            Unbounded => len,
+        };
+        assert!(start <= end, "lower bound was too large");
+        assert!(end <= len, "upper bound was too large");
+        (start, end)
+    }
+
+    /// Creates an iterator that covers the specified range in the `VecDeque`.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the starting point is greater than the end point or if
+    /// the end point is greater than the length of the vector.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(deque_range)]
+    ///
+    /// use std::collections::VecDeque;
+    ///
+    /// let v: VecDeque<_> = vec![1, 2, 3].into_iter().collect();
+    /// let range = v.range(2..).copied().collect::<VecDeque<_>>();
+    /// assert_eq!(range, [3]);
+    ///
+    /// // A full range covers all contents
+    /// let all = v.range(..);
+    /// assert_eq!(all.len(), 3);
+    /// ```
+    #[inline]
+    #[unstable(feature = "deque_range", issue = "74217")]
+    pub fn range<R>(&self, range: R) -> Iter<'_, T>
+    where
+        R: RangeBounds<usize>,
+    {
+        let (start, end) = self.range_start_end(range);
+        let tail = self.wrap_add(self.tail, start);
+        let head = self.wrap_add(self.tail, end);
+        Iter {
+            tail,
+            head,
+            // The shared reference we have in &self is maintained in the '_ of Iter.
+            ring: unsafe { self.buffer_as_slice() },
+        }
+    }
+
+    /// Creates an iterator that covers the specified mutable range in the `VecDeque`.
+    ///
+    /// # Panics
+    ///
+    /// Panics if the starting point is greater than the end point or if
+    /// the end point is greater than the length of the vector.
+    ///
+    /// # Examples
+    ///
+    /// ```
+    /// #![feature(deque_range)]
+    ///
+    /// use std::collections::VecDeque;
+    ///
+    /// let mut v: VecDeque<_> = vec![1, 2, 3].into_iter().collect();
+    /// for v in v.range_mut(2..) {
+    ///   *v *= 2;
+    /// }
+    /// assert_eq!(v, vec![1, 2, 6]);
+    ///
+    /// // A full range covers all contents
+    /// for v in v.range_mut(..) {
+    ///   *v *= 2;
+    /// }
+    /// assert_eq!(v, vec![2, 4, 12]);
+    /// ```
+    #[inline]
+    #[unstable(feature = "deque_range", issue = "74217")]
+    pub fn range_mut<R>(&mut self, range: R) -> IterMut<'_, T>
+    where
+        R: RangeBounds<usize>,
+    {
+        let (start, end) = self.range_start_end(range);
+        let tail = self.wrap_add(self.tail, start);
+        let head = self.wrap_add(self.tail, end);
+        IterMut {
+            tail,
+            head,
+            // The shared reference we have in &mut self is maintained in the '_ of IterMut.
+            ring: unsafe { self.buffer_as_mut_slice() },
+        }
+    }
+
     /// Creates a draining iterator that removes the specified range in the
     /// `VecDeque` and yields the removed items.
     ///
@@ -1129,19 +1231,7 @@ impl<T> VecDeque<T> {
         // When finished, the remaining data will be copied back to cover the hole,
         // and the head/tail values will be restored correctly.
         //
-        let len = self.len();
-        let start = match range.start_bound() {
-            Included(&n) => n,
-            Excluded(&n) => n + 1,
-            Unbounded => 0,
-        };
-        let end = match range.end_bound() {
-            Included(&n) => n + 1,
-            Excluded(&n) => n,
-            Unbounded => len,
-        };
-        assert!(start <= end, "drain lower bound was too large");
-        assert!(end <= len, "drain upper bound was too large");
+        let (start, end) = self.range_start_end(range);
 
         // The deque's elements are parted into three segments:
         // * self.tail  -> drain_tail

src/liballoc/collections/vec_deque/tests.rs

@@ -246,6 +246,65 @@ fn test_remove() {
     }
 }
 
+#[test]
+fn test_range() {
+    let mut tester: VecDeque<usize> = VecDeque::with_capacity(7);
+
+    let cap = tester.capacity();
+    for len in 0..=cap {
+        for tail in 0..=cap {
+            for start in 0..=len {
+                for end in start..=len {
+                    tester.tail = tail;
+                    tester.head = tail;
+                    for i in 0..len {
+                        tester.push_back(i);
+                    }
+
+                    // Check that we iterate over the correct values
+                    let range: VecDeque<_> = tester.range(start..end).copied().collect();
+                    let expected: VecDeque<_> = (start..end).collect();
+                    assert_eq!(range, expected);
+                }
+            }
+        }
+    }
+}
+
+#[test]
+fn test_range_mut() {
+    let mut tester: VecDeque<usize> = VecDeque::with_capacity(7);
+
+    let cap = tester.capacity();
+    for len in 0..=cap {
+        for tail in 0..=cap {
+            for start in 0..=len {
+                for end in start..=len {
+                    tester.tail = tail;
+                    tester.head = tail;
+                    for i in 0..len {
+                        tester.push_back(i);
+                    }
+
+                    let head_was = tester.head;
+                    let tail_was = tester.tail;
+
+                    // Check that we iterate over the correct values
+                    let range: VecDeque<_> = tester.range_mut(start..end).map(|v| *v).collect();
+                    let expected: VecDeque<_> = (start..end).collect();
+                    assert_eq!(range, expected);
+
+                    // We shouldn't have changed the capacity or made the
+                    // head or tail out of bounds
+                    assert_eq!(tester.capacity(), cap);
+                    assert_eq!(tester.tail, tail_was);
+                    assert_eq!(tester.head, head_was);
+                }
+            }
+        }
+    }
+}
+
 #[test]
 fn test_drain() {
     let mut tester: VecDeque<usize> = VecDeque::with_capacity(7);

src/liballoc/lib.rs

@@ -89,6 +89,7 @@
 #![feature(const_in_array_repeat_expressions)]
 #![cfg_attr(bootstrap, feature(const_if_match))]
 #![feature(cow_is_borrowed)]
+#![feature(deque_range)]
 #![feature(dispatch_from_dyn)]
 #![feature(core_intrinsics)]
 #![feature(container_error_extra)]

src/libcore/ffi.rs

@@ -280,7 +280,7 @@ impl<'a, 'f: 'a> DerefMut for VaList<'a, 'f> {
 // within a private module. Once RFC 2145 has been implemented look into
 // improving this.
 mod sealed_trait {
-    /// Trait which whitelists the allowed types to be used with [VaList::arg]
+    /// Trait which permits the allowed types to be used with [VaList::arg].
     ///
     /// [VaList::arg]: ../struct.VaList.html#method.arg
     #[unstable(

src/libcore/future/mod.rs

@@ -12,6 +12,7 @@ use crate::{
 mod future;
 mod into_future;
 mod pending;
+mod poll_fn;
 mod ready;
 
 #[stable(feature = "futures_api", since = "1.36.0")]
@@ -25,6 +26,9 @@ pub use pending::{pending, Pending};
 #[unstable(feature = "future_readiness_fns", issue = "70921")]
 pub use ready::{ready, Ready};
 
+#[unstable(feature = "future_poll_fn", issue = "72302")]
+pub use poll_fn::{poll_fn, PollFn};
+
 /// This type is needed because:
 ///
 /// a) Generators cannot implement `for<'a, 'b> Generator<&'a mut Context<'b>>`, so we need to pass