Auto merge of rust-lang#67310 - Centril:rollup-22jiyow, r=Centril

Rollup of 6 pull requests

Successful merges:

 - rust-lang#67255 (Remove i686-unknown-dragonfly target)
 - rust-lang#67267 (Fix signature of `__wasilibc_find_relpath`)
 - rust-lang#67282 (Fix example code of OpenOptions::open)
 - rust-lang#67289 (Do not ICE on unnamed future)
 - rust-lang#67300 (Restore original implementation of Vec::retain)
 - rust-lang#67305 (Doc typo)

Failed merges:

r? @ghost

Author: bors

src/liballoc/vec.rs

@@ -1079,7 +1079,22 @@ impl<T> Vec<T> {
     pub fn retain<F>(&mut self, mut f: F)
         where F: FnMut(&T) -> bool
     {
-        self.drain_filter(|x| !f(x));
+        let len = self.len();
+        let mut del = 0;
+        {
+            let v = &mut **self;
+
+            for i in 0..len {
+                if !f(&v[i]) {
+                    del += 1;
+                } else if del > 0 {
+                    v.swap(i - del, i);
+                }
+            }
+        }
+        if del > 0 {
+            self.truncate(len - del);
+        }
     }
 
     /// Removes all but the first of consecutive elements in the vector that resolve to the same

src/libcore/num/mod.rs

@@ -144,7 +144,7 @@ NonZeroI8 NonZeroI16 NonZeroI32 NonZeroI64 NonZeroI128 NonZeroIsize }
 
 /// Provides intentionally-wrapped arithmetic on `T`.
 ///
-/// Operations like `+` on `u32` values is intended to never overflow,
+/// Operations like `+` on `u32` values are intended to never overflow,
 /// and in some debug configurations overflow is detected and results
 /// in a panic. While most arithmetic falls into this category, some
 /// code explicitly expects and relies upon modular arithmetic (e.g.,

src/librustc/hir/map/mod.rs

@@ -1016,8 +1016,8 @@ impl<'hir> Map<'hir> {
         }
     }
 
-    pub fn name(&self, id: HirId) -> Name {
-        match self.get(id) {
+    pub fn opt_name(&self, id: HirId) -> Option<Name> {
+        Some(match self.get(id) {
             Node::Item(i) => i.ident.name,
             Node::ForeignItem(fi) => fi.ident.name,
             Node::ImplItem(ii) => ii.ident.name,
@@ -1028,7 +1028,14 @@ impl<'hir> Map<'hir> {
             Node::GenericParam(param) => param.name.ident().name,
             Node::Binding(&Pat { kind: PatKind::Binding(_, _, l, _), .. }) => l.name,
             Node::Ctor(..) => self.name(self.get_parent_item(id)),
-            _ => bug!("no name for {}", self.node_to_string(id))
+            _ => return None,
+        })
+    }
+
+    pub fn name(&self, id: HirId) -> Name {
+        match self.opt_name(id) {
+            Some(name) => name,
+            None => bug!("no name for {}", self.node_to_string(id)),
         }
     }
 

src/librustc/traits/error_reporting.rs

@@ -2404,7 +2404,7 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
             let message = if let Some(name) = last_generator
                 .and_then(|generator_did| self.tcx.parent(generator_did))
                 .and_then(|parent_did| self.tcx.hir().as_local_hir_id(parent_did))
-                .map(|parent_hir_id| self.tcx.hir().name(parent_hir_id))
+                .and_then(|parent_hir_id| self.tcx.hir().opt_name(parent_hir_id))
             {
                 format!("future returned by `{}` is not {}", name, trait_name)
             } else {

src/librustc_target/spec/i686_unknown_dragonfly.rs

@@ -398,7 +398,6 @@ supported_targets! {
     ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
     ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
 
-    ("i686-unknown-dragonfly", i686_unknown_dragonfly),
     ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
 
     ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),

src/librustc_target/spec/mod.rs

@@ -936,7 +936,7 @@ impl OpenOptions {
     /// ```no_run
     /// use std::fs::OpenOptions;
     ///
-    /// let file = OpenOptions::new().open("foo.txt");
+    /// let file = OpenOptions::new().read(true).open("foo.txt");
     /// ```
     ///
     /// [`ErrorKind`]: ../io/enum.ErrorKind.html

src/libstd/fs.rs

@@ -364,7 +364,7 @@ impl OpenOptions {
 
 impl File {
     pub fn open(path: &Path, opts: &OpenOptions) -> io::Result<File> {
-        let (dir, file) = open_parent(path, wasi::RIGHTS_PATH_OPEN)?;
+        let (dir, file) = open_parent(path)?;
         open_at(&dir, &file, opts)
     }
 
@@ -452,7 +452,7 @@ impl DirBuilder {
     }
 
     pub fn mkdir(&self, p: &Path) -> io::Result<()> {
-        let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_CREATE_DIRECTORY)?;
+        let (dir, file) = open_parent(p)?;
         dir.create_directory(osstr2str(file.as_ref())?)
     }
 }
@@ -478,13 +478,13 @@ pub fn readdir(p: &Path) -> io::Result<ReadDir> {
 }
 
 pub fn unlink(p: &Path) -> io::Result<()> {
-    let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_UNLINK_FILE)?;
+    let (dir, file) = open_parent(p)?;
     dir.unlink_file(osstr2str(file.as_ref())?)
 }
 
 pub fn rename(old: &Path, new: &Path) -> io::Result<()> {
-    let (old, old_file) = open_parent(old, wasi::RIGHTS_PATH_RENAME_SOURCE)?;
-    let (new, new_file) = open_parent(new, wasi::RIGHTS_PATH_RENAME_TARGET)?;
+    let (old, old_file) = open_parent(old)?;
+    let (new, new_file) = open_parent(new)?;
     old.rename(osstr2str(old_file.as_ref())?, &new, osstr2str(new_file.as_ref())?)
 }
 
@@ -495,12 +495,12 @@ pub fn set_perm(_p: &Path, _perm: FilePermissions) -> io::Result<()> {
 }
 
 pub fn rmdir(p: &Path) -> io::Result<()> {
-    let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_REMOVE_DIRECTORY)?;
+    let (dir, file) = open_parent(p)?;
     dir.remove_directory(osstr2str(file.as_ref())?)
 }
 
 pub fn readlink(p: &Path) -> io::Result<PathBuf> {
-    let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_READLINK)?;
+    let (dir, file) = open_parent(p)?;
     read_link(&dir, &file)
 }
 
@@ -536,13 +536,13 @@ fn read_link(fd: &WasiFd, file: &Path) -> io::Result<PathBuf> {
 }
 
 pub fn symlink(src: &Path, dst: &Path) -> io::Result<()> {
-    let (dst, dst_file) = open_parent(dst, wasi::RIGHTS_PATH_SYMLINK)?;
+    let (dst, dst_file) = open_parent(dst)?;
     dst.symlink(osstr2str(src.as_ref())?, osstr2str(dst_file.as_ref())?)
 }
 
 pub fn link(src: &Path, dst: &Path) -> io::Result<()> {
-    let (src, src_file) = open_parent(src, wasi::RIGHTS_PATH_LINK_SOURCE)?;
-    let (dst, dst_file) = open_parent(dst, wasi::RIGHTS_PATH_LINK_TARGET)?;
+    let (src, src_file) = open_parent(src)?;
+    let (dst, dst_file) = open_parent(dst)?;
     src.link(
         wasi::LOOKUPFLAGS_SYMLINK_FOLLOW,
         osstr2str(src_file.as_ref())?,
@@ -552,12 +552,12 @@ pub fn link(src: &Path, dst: &Path) -> io::Result<()> {
 }
 
 pub fn stat(p: &Path) -> io::Result<FileAttr> {
-    let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_FILESTAT_GET)?;
+    let (dir, file) = open_parent(p)?;
     metadata_at(&dir, wasi::LOOKUPFLAGS_SYMLINK_FOLLOW, &file)
 }
 
 pub fn lstat(p: &Path) -> io::Result<FileAttr> {
-    let (dir, file) = open_parent(p, wasi::RIGHTS_PATH_FILESTAT_GET)?;
+    let (dir, file) = open_parent(p)?;
     metadata_at(&dir, 0, &file)
 }
 
@@ -611,11 +611,11 @@ fn open_at(fd: &WasiFd, path: &Path, opts: &OpenOptions) -> io::Result<File> {
 ///
 /// Note that this can fail if `p` doesn't look like it can be opened relative
 /// to any preopened file descriptor.
-fn open_parent(p: &Path, rights: wasi::Rights) -> io::Result<(ManuallyDrop<WasiFd>, PathBuf)> {
+fn open_parent(p: &Path) -> io::Result<(ManuallyDrop<WasiFd>, PathBuf)> {
     let p = CString::new(p.as_os_str().as_bytes())?;
     unsafe {
         let mut ret = ptr::null();
-        let fd = libc::__wasilibc_find_relpath(p.as_ptr(), rights, 0, &mut ret);
+        let fd = __wasilibc_find_relpath(p.as_ptr(), &mut ret);
         if fd == -1 {
             let msg = format!(
                 "failed to find a preopened file descriptor \
@@ -635,6 +635,13 @@ fn open_parent(p: &Path, rights: wasi::Rights) -> io::Result<(ManuallyDrop<WasiF
 
         return Ok((ManuallyDrop::new(WasiFd::from_raw(fd as u32)), path));
     }
+
+    extern "C" {
+        pub fn __wasilibc_find_relpath(
+            path: *const libc::c_char,
+            relative_path: *mut *const libc::c_char,
+        ) -> libc::c_int;
+    }
 }
 
 pub fn osstr2str(f: &OsStr) -> io::Result<&str> {

src/libstd/sys/wasi/fs.rs

@@ -0,0 +1,24 @@
+// edition:2018
+use std::future::Future;
+use std::pin::Pin;
+use std::task::{Context, Poll};
+
+fn spawn<T: Send>(_: T) {}
+
+pub struct AFuture;
+impl Future for AFuture{
+    type Output = ();
+
+    fn poll(mut self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<()> {
+        unimplemented!()
+    }
+}
+
+async fn foo() {
+    spawn(async { //~ ERROR future cannot be sent between threads safely
+        let _a = std::ptr::null_mut::<()>(); // `*mut ()` is not `Send`
+        AFuture.await;
+    });
+}
+
+fn main() {}

src/test/ui/async-await/issue-67252-unnamed-future.rs

@@ -0,0 +1,22 @@
+error: future cannot be sent between threads safely
+  --> $DIR/issue-67252-unnamed-future.rs:18:5
+   |
+LL | fn spawn<T: Send>(_: T) {}
+   |    -----    ---- required by this bound in `spawn`
+...
+LL |     spawn(async {
+   |     ^^^^^ future is not `Send`
+   |
+   = help: within `impl std::future::Future`, the trait `std::marker::Send` is not implemented for `*mut ()`
+note: future is not `Send` as this value is used across an await
+  --> $DIR/issue-67252-unnamed-future.rs:20:9
+   |
+LL |         let _a = std::ptr::null_mut::<()>(); // `*mut ()` is not `Send`
+   |             -- has type `*mut ()`
+LL |         AFuture.await;
+   |         ^^^^^^^^^^^^^ await occurs here, with `_a` maybe used later
+LL |     });
+   |     - `_a` is later dropped here
+
+error: aborting due to previous error
+