Rollup of 4 pull requests

compiler/rustc_hir_analysis/messages.ftl

@@ -351,7 +351,7 @@ hir_analysis_param_in_ty_of_assoc_const_binding =
         *[normal] the {$param_def_kind} `{$param_name}` is defined here
     }
 
-hir_analysis_param_not_captured = `impl Trait` must mention all {$kind} parameters in scope
+hir_analysis_param_not_captured = `impl Trait` must mention all {$kind} parameters in scope in `use<...>`
     .label = {$kind} parameter is implicitly captured by this `impl Trait`
     .note = currently, all {$kind} parameters are required to be mentioned in the precise captures list
 
@@ -405,6 +405,10 @@ hir_analysis_self_in_impl_self =
     `Self` is not valid in the self type of an impl block
     .note = replace `Self` with a different type
 
+hir_analysis_self_ty_not_captured = `impl Trait` must mention the `Self` type of the trait in `use<...>`
+    .label = `Self` type parameter is implicitly captured by this `impl Trait`
+    .note = currently, all type parameters are required to be mentioned in the precise captures list
+
 hir_analysis_simd_ffi_highly_experimental = use of SIMD type{$snip} in FFI is highly experimental and may result in invalid code
     .help = add `#![feature(simd_ffi)]` to the crate attributes to enable
 

compiler/rustc_hir_analysis/src/check/check.rs

@@ -580,37 +580,52 @@ fn check_opaque_precise_captures<'tcx>(tcx: TyCtxt<'tcx>, opaque_def_id: LocalDe
 
             match param.kind {
                 ty::GenericParamDefKind::Lifetime => {
+                    let use_span = tcx.def_span(param.def_id);
+                    let opaque_span = tcx.def_span(opaque_def_id);
                     // Check if the lifetime param was captured but isn't named in the precise captures list.
                     if variances[param.index as usize] == ty::Invariant {
-                        let param_span = if let DefKind::OpaqueTy =
-                            tcx.def_kind(tcx.parent(param.def_id))
+                        if let DefKind::OpaqueTy = tcx.def_kind(tcx.parent(param.def_id))
                             && let ty::ReEarlyParam(ty::EarlyParamRegion { def_id, .. })
                             | ty::ReLateParam(ty::LateParamRegion {
                                 bound_region: ty::BoundRegionKind::BrNamed(def_id, _),
                                 ..
                             }) = *tcx
                                 .map_opaque_lifetime_to_parent_lifetime(param.def_id.expect_local())
                         {
-                            Some(tcx.def_span(def_id))
+                            tcx.dcx().emit_err(errors::LifetimeNotCaptured {
+                                opaque_span,
+                                use_span,
+                                param_span: tcx.def_span(def_id),
+                            });
                         } else {
-                            None
-                        };
-                        // FIXME(precise_capturing): Structured suggestion for this would be useful
-                        tcx.dcx().emit_err(errors::LifetimeNotCaptured {
-                            use_span: tcx.def_span(param.def_id),
-                            param_span,
-                            opaque_span: tcx.def_span(opaque_def_id),
-                        });
+                            // If the `use_span` is actually just the param itself, then we must
+                            // have not duplicated the lifetime but captured the original.
+                            // The "effective" `use_span` will be the span of the opaque itself,
+                            // and the param span will be the def span of the param.
+                            tcx.dcx().emit_err(errors::LifetimeNotCaptured {
+                                opaque_span,
+                                use_span: opaque_span,
+                                param_span: use_span,
+                            });
+                        }
                         continue;
                     }
                 }
                 ty::GenericParamDefKind::Type { .. } => {
-                    // FIXME(precise_capturing): Structured suggestion for this would be useful
-                    tcx.dcx().emit_err(errors::ParamNotCaptured {
-                        param_span: tcx.def_span(param.def_id),
-                        opaque_span: tcx.def_span(opaque_def_id),
-                        kind: "type",
-                    });
+                    if matches!(tcx.def_kind(param.def_id), DefKind::Trait | DefKind::TraitAlias) {
+                        // FIXME(precise_capturing): Structured suggestion for this would be useful
+                        tcx.dcx().emit_err(errors::SelfTyNotCaptured {
+                            trait_span: tcx.def_span(param.def_id),
+                            opaque_span: tcx.def_span(opaque_def_id),
+                        });
+                    } else {
+                        // FIXME(precise_capturing): Structured suggestion for this would be useful
+                        tcx.dcx().emit_err(errors::ParamNotCaptured {
+                            param_span: tcx.def_span(param.def_id),
+                            opaque_span: tcx.def_span(opaque_def_id),
+                            kind: "type",
+                        });
+                    }
                 }
                 ty::GenericParamDefKind::Const { .. } => {
                     // FIXME(precise_capturing): Structured suggestion for this would be useful

compiler/rustc_hir_analysis/src/errors/precise_captures.rs

@@ -6,19 +6,29 @@ use rustc_span::{Span, Symbol};
 #[note]
 pub struct ParamNotCaptured {
     #[primary_span]
-    pub param_span: Span,
-    #[label]
     pub opaque_span: Span,
+    #[label]
+    pub param_span: Span,
     pub kind: &'static str,
 }
 
+#[derive(Diagnostic)]
+#[diag(hir_analysis_self_ty_not_captured)]
+#[note]
+pub struct SelfTyNotCaptured {
+    #[primary_span]
+    pub opaque_span: Span,
+    #[label]
+    pub trait_span: Span,
+}
+
 #[derive(Diagnostic)]
 #[diag(hir_analysis_lifetime_not_captured)]
 pub struct LifetimeNotCaptured {
     #[primary_span]
     pub use_span: Span,
     #[label(hir_analysis_param_label)]
-    pub param_span: Option<Span>,
+    pub param_span: Span,
     #[label]
     pub opaque_span: Span,
 }

library/core/src/num/int_macros.rs

@@ -3199,7 +3199,8 @@ macro_rules! int_impl {
         /// that code in debug mode will trigger a panic on this case and
         /// optimized code will return
         #[doc = concat!("`", stringify!($SelfT), "::MIN`")]
-        /// without a panic.
+        /// without a panic. If you do not want this behavior consider
+        /// using [`unsigned_abs`](Self::unsigned_abs) instead.
         ///
         /// # Examples
         ///

library/std/src/sys/pal/unix/fd.rs

@@ -45,13 +45,9 @@ const READ_LIMIT: usize = libc::ssize_t::MAX as usize;
 #[cfg(any(
     target_os = "dragonfly",
     target_os = "freebsd",
-    target_os = "ios",
-    target_os = "tvos",
-    target_os = "macos",
     target_os = "netbsd",
     target_os = "openbsd",
-    target_os = "watchos",
-    target_os = "visionos",
+    target_vendor = "apple",
 ))]
 const fn max_iov() -> usize {
     libc::IOV_MAX as usize
@@ -72,17 +68,13 @@ const fn max_iov() -> usize {
     target_os = "dragonfly",
     target_os = "emscripten",
     target_os = "freebsd",
-    target_os = "ios",
-    target_os = "tvos",
     target_os = "linux",
-    target_os = "macos",
     target_os = "netbsd",
     target_os = "nto",
     target_os = "openbsd",
     target_os = "horizon",
     target_os = "vita",
-    target_os = "watchos",
-    target_os = "visionos",
+    target_vendor = "apple",
 )))]
 const fn max_iov() -> usize {
     16 // The minimum value required by POSIX.
@@ -201,13 +193,10 @@ impl FileDesc {
         target_os = "fuchsia",
         target_os = "hurd",
         target_os = "illumos",
-        target_os = "ios",
-        target_os = "tvos",
         target_os = "linux",
-        target_os = "macos",
         target_os = "netbsd",
         target_os = "openbsd",
-        target_os = "watchos",
+        target_vendor = "apple",
     )))]
     pub fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
         io::default_read_vectored(|b| self.read_at(b, offset), bufs)
@@ -241,15 +230,7 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
-    // We support old MacOS and iOS versions that do not have `preadv`. There is
-    // no `syscall` possible in these platform.
-    #[cfg(any(
-        all(target_os = "android", target_pointer_width = "32"),
-        target_os = "ios", // ios 14.0
-        target_os = "tvos", // tvos 14.0
-        target_os = "macos", // macos 11.0
-        target_os = "watchos", // watchos 7.0
-    ))]
+    #[cfg(all(target_os = "android", target_pointer_width = "32"))]
     pub fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
         super::weak::weak!(fn preadv64(libc::c_int, *const libc::iovec, libc::c_int, off64_t) -> isize);
 
@@ -269,6 +250,35 @@ impl FileDesc {
         }
     }
 
+    // We support old MacOS, iOS, watchOS, tvOS and visionOS. `preadv` was added in the following
+    // Apple OS versions:
+    // ios 14.0
+    // tvos 14.0
+    // macos 11.0
+    // watchos 7.0
+    //
+    // These versions may be newer than the minimum supported versions of OS's we support so we must
+    // use "weak" linking.
+    #[cfg(target_vendor = "apple")]
+    pub fn read_vectored_at(&self, bufs: &mut [IoSliceMut<'_>], offset: u64) -> io::Result<usize> {
+        super::weak::weak!(fn preadv(libc::c_int, *const libc::iovec, libc::c_int, off64_t) -> isize);
+
+        match preadv.get() {
+            Some(preadv) => {
+                let ret = cvt(unsafe {
+                    preadv(
+                        self.as_raw_fd(),
+                        bufs.as_mut_ptr() as *mut libc::iovec as *const libc::iovec,
+                        cmp::min(bufs.len(), max_iov()) as libc::c_int,
+                        offset as _,
+                    )
+                })?;
+                Ok(ret as usize)
+            }
+            None => io::default_read_vectored(|b| self.read_at(b, offset), bufs),
+        }
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         let ret = cvt(unsafe {
             libc::write(
@@ -360,13 +370,10 @@ impl FileDesc {
         target_os = "fuchsia",
         target_os = "hurd",
         target_os = "illumos",
-        target_os = "ios",
-        target_os = "tvos",
         target_os = "linux",
-        target_os = "macos",
         target_os = "netbsd",
         target_os = "openbsd",
-        target_os = "watchos",
+        target_vendor = "apple",
     )))]
     pub fn write_vectored_at(&self, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
         io::default_write_vectored(|b| self.write_at(b, offset), bufs)
@@ -400,15 +407,7 @@ impl FileDesc {
         Ok(ret as usize)
     }
 
-    // We support old MacOS and iOS versions that do not have `pwritev`. There is
-    // no `syscall` possible in these platform.
-    #[cfg(any(
-        all(target_os = "android", target_pointer_width = "32"),
-        target_os = "ios", // ios 14.0
-        target_os = "tvos", // tvos 14.0
-        target_os = "macos", // macos 11.0
-        target_os = "watchos", // watchos 7.0
-    ))]
+    #[cfg(all(target_os = "android", target_pointer_width = "32"))]
     pub fn write_vectored_at(&self, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
         super::weak::weak!(fn pwritev64(libc::c_int, *const libc::iovec, libc::c_int, off64_t) -> isize);
 
@@ -428,6 +427,35 @@ impl FileDesc {
         }
     }
 
+    // We support old MacOS, iOS, watchOS, tvOS and visionOS. `pwritev` was added in the following
+    // Apple OS versions:
+    // ios 14.0
+    // tvos 14.0
+    // macos 11.0
+    // watchos 7.0
+    //
+    // These versions may be newer than the minimum supported versions of OS's we support so we must
+    // use "weak" linking.
+    #[cfg(target_vendor = "apple")]
+    pub fn write_vectored_at(&self, bufs: &[IoSlice<'_>], offset: u64) -> io::Result<usize> {
+        super::weak::weak!(fn pwritev(libc::c_int, *const libc::iovec, libc::c_int, off64_t) -> isize);
+
+        match pwritev.get() {
+            Some(pwritev) => {
+                let ret = cvt(unsafe {
+                    pwritev(
+                        self.as_raw_fd(),
+                        bufs.as_ptr() as *const libc::iovec,
+                        cmp::min(bufs.len(), max_iov()) as libc::c_int,
+                        offset as _,
+                    )
+                })?;
+                Ok(ret as usize)
+            }
+            None => io::default_write_vectored(|b| self.write_at(b, offset), bufs),
+        }
+    }
+
     #[cfg(not(any(
         target_env = "newlib",
         target_os = "solaris",

library/std/src/sys/pal/unix/weak.rs

@@ -28,7 +28,7 @@ use crate::ptr;
 use crate::sync::atomic::{self, AtomicPtr, Ordering};
 
 // We can use true weak linkage on ELF targets.
-#[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "tvos")))]
+#[cfg(all(unix, not(target_vendor = "apple")))]
 pub(crate) macro weak {
     (fn $name:ident($($t:ty),*) -> $ret:ty) => (
         let ref $name: ExternWeak<unsafe extern "C" fn($($t),*) -> $ret> = {
@@ -43,7 +43,7 @@ pub(crate) macro weak {
 }
 
 // On non-ELF targets, use the dlsym approximation of weak linkage.
-#[cfg(any(target_os = "macos", target_os = "ios", target_os = "tvos"))]
+#[cfg(target_vendor = "apple")]
 pub(crate) use self::dlsym as weak;
 
 pub(crate) struct ExternWeak<F: Copy> {

src/bootstrap/src/bin/main.rs

@@ -37,6 +37,7 @@ fn main() {
 
         build_lock = fd_lock::RwLock::new(t!(fs::OpenOptions::new()
             .write(true)
+            .truncate(true)
             .create(true)
             .open(&lock_path)));
         _build_lock_guard = match build_lock.try_write() {
@@ -143,8 +144,8 @@ fn check_version(config: &Config) -> Option<String> {
         // then use the one from the config.toml. This way we never show the same warnings
         // more than once.
         if let Ok(t) = fs::read_to_string(&warned_id_path) {
-            let last_warned_id =
-                usize::from_str(&t).expect(&format!("{} is corrupted.", warned_id_path.display()));
+            let last_warned_id = usize::from_str(&t)
+                .unwrap_or_else(|_| panic!("{} is corrupted.", warned_id_path.display()));
 
             // We only use the last_warned_id if it exists in `CONFIG_CHANGE_HISTORY`.
             // Otherwise, we may retrieve all the changes if it's not the highest value.