Auto merge of #46130 - kennytm:rollup, r=kennytm

Rollup of 9 pull requests

- Successful merges: #46082, #46088, #46092, #46107, #46119, #46121, #46122, #46124, #46128
- Failed merges:

src/liballoc/arc.rs

@@ -1328,7 +1328,7 @@ impl<T: ?Sized + fmt::Debug> fmt::Debug for Arc<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> fmt::Pointer for Arc<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Pointer::fmt(&self.ptr, f)
+        fmt::Pointer::fmt(&(&**self as *const T), f)
     }
 }
 

src/liballoc/fmt.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Utilities for formatting and printing `String`s
+//! Utilities for formatting and printing `String`s.
 //!
 //! This module contains the runtime support for the [`format!`] syntax extension.
 //! This macro is implemented in the compiler to emit calls to this module in

src/liballoc/rc.rs

@@ -1072,7 +1072,7 @@ impl<T: ?Sized + fmt::Debug> fmt::Debug for Rc<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized> fmt::Pointer for Rc<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Pointer::fmt(&self.ptr, f)
+        fmt::Pointer::fmt(&(&**self as *const T), f)
     }
 }
 

src/liballoc/str.rs

@@ -1734,7 +1734,7 @@ impl str {
     /// A more complex pattern, using a closure:
     ///
     /// ```
-    /// assert_eq!("1fooX".trim_left_matches(|c| c == '1' || c == 'X'), "fooX");
+    /// assert_eq!("1fooX".trim_right_matches(|c| c == '1' || c == 'X'), "1foo");
     /// ```
     #[stable(feature = "rust1", since = "1.0.0")]
     pub fn trim_right_matches<'a, P: Pattern<'a>>(&'a self, pat: P) -> &'a str

src/libcore/macros.rs

@@ -361,7 +361,7 @@ macro_rules! try {
     })
 }
 
-/// Write formatted data into a buffer
+/// Write formatted data into a buffer.
 ///
 /// This macro accepts a format string, a list of arguments, and a 'writer'. Arguments will be
 /// formatted according to the specified format string and the result will be passed to the writer.

src/librustc_mir/borrow_check.rs

@@ -91,7 +91,7 @@ fn do_mir_borrowck<'a, 'gcx, 'tcx>(infcx: &InferCtxt<'a, 'gcx, 'tcx>,
                     IllegalMoveOriginKind::Static =>
                         tcx.cannot_move_out_of(span, "static item", origin),
                     IllegalMoveOriginKind::BorrowedContent =>
-                        tcx.cannot_move_out_of(span, "borrowed_content", origin),
+                        tcx.cannot_move_out_of(span, "borrowed content", origin),
                     IllegalMoveOriginKind::InteriorOfTypeWithDestructor { container_ty: ty } =>
                         tcx.cannot_move_out_of_interior_of_drop(span, ty, origin),
                     IllegalMoveOriginKind::InteriorOfSliceOrArray { ty, is_index } =>

src/libstd/f32.rs

@@ -9,8 +9,9 @@
 // except according to those terms.
 
 //! This module provides constants which are specific to the implementation
-//! of the `f32` floating point data type. Mathematically significant
-//! numbers are provided in the `consts` sub-module.
+//! of the `f32` floating point data type.
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 //!
 //! *[See also the `f32` primitive type](../primitive.f32.html).*
 

src/libstd/f64.rs

@@ -9,8 +9,9 @@
 // except according to those terms.
 
 //! This module provides constants which are specific to the implementation
-//! of the `f64` floating point data type. Mathematically significant
-//! numbers are provided in the `consts` sub-module.
+//! of the `f64` floating point data type.
+//!
+//! Mathematically significant numbers are provided in the `consts` sub-module.
 //!
 //! *[See also the `f64` primitive type](../primitive.f64.html).*
 

src/libstd/io/mod.rs

@@ -419,14 +419,8 @@ fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize>
 ///
 /// [`File`]s implement `Read`:
 ///
-/// [`read()`]: trait.Read.html#tymethod.read
-/// [`std::io`]: ../../std/io/index.html
-/// [`File`]: ../fs/struct.File.html
-/// [`BufRead`]: trait.BufRead.html
-/// [`BufReader`]: struct.BufReader.html
-///
 /// ```
-/// use std::io;
+/// # use std::io;
 /// use std::io::prelude::*;
 /// use std::fs::File;
 ///
@@ -449,6 +443,32 @@ fn read_to_end<R: Read + ?Sized>(r: &mut R, buf: &mut Vec<u8>) -> Result<usize>
 /// # Ok(())
 /// # }
 /// ```
+///
+/// Read from `&str` because [`&[u8]`] implements [`Read`]:
+///
+/// ```
+/// # use std::io;
+/// use std::io::prelude::*;
+///
+/// # fn foo() -> io::Result<()> {
+/// let mut b = "This string will be read".as_bytes();
+/// let mut buffer = [0; 10];
+///
+/// // read up to 10 bytes
+/// b.read(&mut buffer)?;
+///
+/// // etc... it works exactly as a File does!
+/// # Ok(())
+/// # }
+/// ```
+///
+/// [`read()`]: trait.Read.html#tymethod.read
+/// [`std::io`]: ../../std/io/index.html
+/// [`File`]: ../fs/struct.File.html
+/// [`BufRead`]: trait.BufRead.html
+/// [`BufReader`]: struct.BufReader.html
+/// [`&[u8]`]: primitive.slice.html
+///
 #[stable(feature = "rust1", since = "1.0.0")]
 pub trait Read {
     /// Pull some bytes from this source into the specified buffer, returning

src/libstd/panic.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-//! Panic support in the standard library
+//! Panic support in the standard library.
 
 #![stable(feature = "std_panic", since = "1.9.0")]
 

src/libstd/sync/mutex.rs

@@ -382,6 +382,17 @@ unsafe impl<#[may_dangle] T: ?Sized> Drop for Mutex<T> {
     }
 }
 
+#[stable(feature = "mutex_from", since = "1.22.0")]
+impl<T> From<T> for Mutex<T> {
+    /// Creates a new mutex in an unlocked state ready for use.
+    /// This is equivalent to [`Mutex::new`].
+    ///
+    /// [`Mutex::new`]: #method.new
+    fn from(t: T) -> Self {
+        Mutex::new(t)
+    }
+}
+
 #[stable(feature = "mutex_default", since = "1.10.0")]
 impl<T: ?Sized + Default> Default for Mutex<T> {
     /// Creates a `Mutex<T>`, with the `Default` value for T.

src/libstd/sync/rwlock.rs

@@ -457,6 +457,17 @@ impl<T: Default> Default for RwLock<T> {
     }
 }
 
+#[stable(feature = "rw_lock_from", since = "1.22.0")]
+impl<T> From<T> for RwLock<T> {
+    /// Creates a new instance of an `RwLock<T>` which is unlocked.
+    /// This is equivalent to [`RwLock::new`].
+    ///
+    /// [`RwLock::new`]: #method.new
+    fn from(t: T) -> Self {
+        RwLock::new(t)
+    }
+}
+
 impl<'rwlock, T: ?Sized> RwLockReadGuard<'rwlock, T> {
     unsafe fn new(lock: &'rwlock RwLock<T>)
                   -> LockResult<RwLockReadGuard<'rwlock, T>> {

src/libstd/sys/redox/os.rs

@@ -213,3 +213,7 @@ pub fn exit(code: i32) -> ! {
 pub fn getpid() -> u32 {
     syscall::getpid().unwrap() as u32
 }
+
+pub fn getppid() -> u32 {
+    syscall::getppid().unwrap() as u32
+}

src/libstd/sys/unix/ext/process.rs

@@ -191,3 +191,9 @@ impl IntoRawFd for process::ChildStderr {
         self.into_inner().into_fd().into_raw()
     }
 }
+
+/// Returns the OS-assigned process identifier associated with this process's parent.
+#[unstable(feature = "unix_ppid", issue = "46104")]
+pub fn parent_id() -> u32 {
+    ::sys::os::getppid()
+}

src/libstd/sys/unix/os.rs

@@ -515,3 +515,7 @@ pub fn exit(code: i32) -> ! {
 pub fn getpid() -> u32 {
     unsafe { libc::getpid() as u32 }
 }
+
+pub fn getppid() -> u32 {
+    unsafe { libc::getppid() as u32 }
+}

src/rustllvm/ArchiveWrapper.cpp

@@ -66,7 +66,7 @@ static Archive::Kind fromRust(LLVMRustArchiveKind Kind) {
   case LLVMRustArchiveKind::COFF:
     return Archive::K_COFF;
   default:
-    llvm_unreachable("Bad ArchiveKind.");
+    report_fatal_error("Bad ArchiveKind.");
   }
 }
 

src/rustllvm/PassWrapper.cpp

@@ -235,7 +235,7 @@ static CodeModel::Model fromRust(LLVMRustCodeModel Model) {
   case LLVMRustCodeModel::Large:
     return CodeModel::Large;
   default:
-    llvm_unreachable("Bad CodeModel.");
+    report_fatal_error("Bad CodeModel.");
   }
 }
 
@@ -258,7 +258,7 @@ static CodeGenOpt::Level fromRust(LLVMRustCodeGenOptLevel Level) {
   case LLVMRustCodeGenOptLevel::Aggressive:
     return CodeGenOpt::Aggressive;
   default:
-    llvm_unreachable("Bad CodeGenOptLevel.");
+    report_fatal_error("Bad CodeGenOptLevel.");
   }
 }
 
@@ -302,7 +302,7 @@ static Optional<Reloc::Model> fromRust(LLVMRustRelocMode RustReloc) {
     break;
 #endif
   }
-  llvm_unreachable("Bad RelocModel.");
+  report_fatal_error("Bad RelocModel.");
 }
 
 #if LLVM_RUSTLLVM
@@ -511,7 +511,7 @@ static TargetMachine::CodeGenFileType fromRust(LLVMRustFileType Type) {
   case LLVMRustFileType::ObjectFile:
     return TargetMachine::CGFT_ObjectFile;
   default:
-    llvm_unreachable("Bad FileType.");
+    report_fatal_error("Bad FileType.");
   }
 }
 
@@ -1197,7 +1197,7 @@ extern "C" bool
 LLVMRustWriteThinBitcodeToFile(LLVMPassManagerRef PMR,
                                LLVMModuleRef M,
                                const char *BcFile) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 struct LLVMRustThinLTOData {
@@ -1211,62 +1211,62 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
                           int num_modules,
                           const char **preserved_symbols,
                           int num_symbols) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" bool
 LLVMRustPrepareThinLTORename(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" bool
 LLVMRustPrepareThinLTOResolveWeak(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" bool
 LLVMRustPrepareThinLTOInternalize(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" bool
 LLVMRustPrepareThinLTOImport(const LLVMRustThinLTOData *Data, LLVMModuleRef M) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" void
 LLVMRustFreeThinLTOData(LLVMRustThinLTOData *Data) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 struct LLVMRustThinLTOBuffer {
 };
 
 extern "C" LLVMRustThinLTOBuffer*
 LLVMRustThinLTOBufferCreate(LLVMModuleRef M) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" void
 LLVMRustThinLTOBufferFree(LLVMRustThinLTOBuffer *Buffer) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" const void*
 LLVMRustThinLTOBufferPtr(const LLVMRustThinLTOBuffer *Buffer) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" size_t
 LLVMRustThinLTOBufferLen(const LLVMRustThinLTOBuffer *Buffer) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 
 extern "C" LLVMModuleRef
 LLVMRustParseBitcodeForThinLTO(LLVMContextRef Context,
                                const char *data,
                                size_t len,
                                const char *identifier) {
-  llvm_unreachable("ThinLTO not available");
+  report_fatal_error("ThinLTO not available");
 }
 #endif // LLVM_VERSION_GE(4, 0)