Auto merge of rust-lang#83454 - JohnTitor:rollup-9ae0565, r=JohnTitor

Rollup of 8 pull requests

Successful merges:

 - rust-lang#83041 (stabilize debug_non_exhaustive)
 - rust-lang#83349 (Remove Option::{unwrap_none, expect_none}.)
 - rust-lang#83420 (Add documentation for rustdoc-gui tests)
 - rust-lang#83421 (Add Result::into_err where the Ok variant is the never type)
 - rust-lang#83427 (small cleanups in rustc_errors / emitter)
 - rust-lang#83434 (Update RELEASES.md)
 - rust-lang#83440 (Use intra-doc link in core::cell)
 - rust-lang#83442 (LLVMWrapper: attractive nuisance macros)

Failed merges:

 - rust-lang#83438 (Update RELEASES.md)

r? `@ghost`
`@rustbot` modify labels: rollup

RELEASES.md

@@ -34,7 +34,6 @@ Compiler
   `aarch64-unknown-linux-gnu_ilp32`, and `aarch64_be-unknown-linux-gnu_ilp32` targets.][81455]
 - [Added tier 3 support for `i386-unknown-linux-gnu` and `i486-unknown-linux-gnu` targets.][80662]
 - [The `target-cpu=native` option will now detect individual features of CPUs.][80749]
-- [Rust now uses `inline-asm` for stack probes when used with LLVM 11.0.1+][77885]
 
 \* Refer to Rust's [platform support page][forge-platform-support] for more
 information on Rust's tiered platform support.
@@ -146,7 +145,6 @@ Internal Only
 [80764]: https://github.com/rust-lang/rust/pull/80764
 [80749]: https://github.com/rust-lang/rust/pull/80749
 [80662]: https://github.com/rust-lang/rust/pull/80662
-[77885]: https://github.com/rust-lang/rust/pull/77885
 [cargo/8997]: https://github.com/rust-lang/cargo/pull/8997
 [cargo/9112]: https://github.com/rust-lang/cargo/pull/9112
 [feature-resolver@2.0]: https://doc.rust-lang.org/nightly/cargo/reference/features.html#feature-resolver-version-2

compiler/rustc_errors/src/emitter.rs

@@ -434,34 +434,31 @@ pub trait Emitter {
         span: &mut MultiSpan,
         children: &mut Vec<SubDiagnostic>,
     ) {
+        let source_map = if let Some(ref sm) = source_map {
+            sm
+        } else {
+            return;
+        };
         debug!("fix_multispans_in_extern_macros: before: span={:?} children={:?}", span, children);
-        for span in iter::once(&mut *span).chain(children.iter_mut().map(|child| &mut child.span)) {
-            self.fix_multispan_in_extern_macros(source_map, span);
+        self.fix_multispan_in_extern_macros(source_map, span);
+        for child in children.iter_mut() {
+            self.fix_multispan_in_extern_macros(source_map, &mut child.span);
         }
         debug!("fix_multispans_in_extern_macros: after: span={:?} children={:?}", span, children);
     }
 
     // This "fixes" MultiSpans that contain `Span`s pointing to locations inside of external macros.
     // Since these locations are often difficult to read,
     // we move these spans from the external macros to their corresponding use site.
-    fn fix_multispan_in_extern_macros(
-        &self,
-        source_map: &Option<Lrc<SourceMap>>,
-        span: &mut MultiSpan,
-    ) {
-        let sm = match source_map {
-            Some(ref sm) => sm,
-            None => return,
-        };
-
+    fn fix_multispan_in_extern_macros(&self, source_map: &Lrc<SourceMap>, span: &mut MultiSpan) {
         // First, find all the spans in external macros and point instead at their use site.
         let replacements: Vec<(Span, Span)> = span
             .primary_spans()
             .iter()
             .copied()
             .chain(span.span_labels().iter().map(|sp_label| sp_label.span))
             .filter_map(|sp| {
-                if !sp.is_dummy() && sm.is_imported(sp) {
+                if !sp.is_dummy() && source_map.is_imported(sp) {
                     let maybe_callsite = sp.source_callsite();
                     if sp != maybe_callsite {
                         return Some((sp, maybe_callsite));
@@ -1232,7 +1229,6 @@ impl EmitterWriter {
         is_secondary: bool,
     ) -> io::Result<()> {
         let mut buffer = StyledBuffer::new();
-        let header_style = if is_secondary { Style::HeaderMsg } else { Style::MainHeaderMsg };
 
         if !msp.has_primary_spans() && !msp.has_span_labels() && is_secondary && !self.short_message
         {
@@ -1257,6 +1253,7 @@ impl EmitterWriter {
                 buffer.append(0, &code, Style::Level(*level));
                 buffer.append(0, "]", Style::Level(*level));
             }
+            let header_style = if is_secondary { Style::HeaderMsg } else { Style::MainHeaderMsg };
             if *level != Level::FailureNote {
                 buffer.append(0, ": ", header_style);
             }
@@ -1470,9 +1467,7 @@ impl EmitterWriter {
                     let mut to_add = FxHashMap::default();
 
                     for (depth, style) in depths {
-                        if multilines.get(&depth).is_some() {
-                            multilines.remove(&depth);
-                        } else {
+                        if multilines.remove(&depth).is_none() {
                             to_add.insert(depth, style);
                         }
                     }
@@ -1726,14 +1721,13 @@ impl EmitterWriter {
                     if !self.short_message {
                         draw_col_separator_no_space(&mut buffer, 0, max_line_num_len + 1);
                     }
-                    match emit_to_destination(
+                    if let Err(e) = emit_to_destination(
                         &buffer.render(),
                         level,
                         &mut self.dst,
                         self.short_message,
                     ) {
-                        Ok(()) => (),
-                        Err(e) => panic!("failed to emit error: {}", e),
+                        panic!("failed to emit error: {}", e)
                     }
                 }
                 if !self.short_message {

compiler/rustc_llvm/llvm-wrapper/LLVMWrapper.h

@@ -33,13 +33,6 @@
   (LLVM_VERSION_MAJOR > (major) ||                                             \
    LLVM_VERSION_MAJOR == (major) && LLVM_VERSION_MINOR >= (minor))
 
-#define LLVM_VERSION_EQ(major, minor)                                          \
-  (LLVM_VERSION_MAJOR == (major) && LLVM_VERSION_MINOR == (minor))
-
-#define LLVM_VERSION_LE(major, minor)                                          \
-  (LLVM_VERSION_MAJOR < (major) ||                                             \
-   LLVM_VERSION_MAJOR == (major) && LLVM_VERSION_MINOR <= (minor))
-
 #define LLVM_VERSION_LT(major, minor) (!LLVM_VERSION_GE((major), (minor)))
 
 #include "llvm/IR/LegacyPassManager.h"

library/core/src/cell.rs

@@ -188,7 +188,7 @@
 //! [`Rc<T>`]: ../../std/rc/struct.Rc.html
 //! [`RwLock<T>`]: ../../std/sync/struct.RwLock.html
 //! [`Mutex<T>`]: ../../std/sync/struct.Mutex.html
-//! [`atomic`]: ../../core/sync/atomic/index.html
+//! [`atomic`]: crate::sync::atomic
 
 #![stable(feature = "rust1", since = "1.0.0")]
 

library/core/src/fmt/builders.rs

@@ -165,7 +165,6 @@ impl<'a, 'b: 'a> DebugStruct<'a, 'b> {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(debug_non_exhaustive)]
     /// use std::fmt;
     ///
     /// struct Bar {
@@ -186,7 +185,7 @@ impl<'a, 'b: 'a> DebugStruct<'a, 'b> {
     ///     "Bar { bar: 10, .. }",
     /// );
     /// ```
-    #[unstable(feature = "debug_non_exhaustive", issue = "67364")]
+    #[stable(feature = "debug_non_exhaustive", since = "1.53.0")]
     pub fn finish_non_exhaustive(&mut self) -> fmt::Result {
         self.result = self.result.and_then(|_| {
             // Draw non-exhaustive dots (`..`), and open brace if necessary (no fields).

library/core/src/option.rs

@@ -150,7 +150,7 @@
 use crate::iter::{FromIterator, FusedIterator, TrustedLen};
 use crate::pin::Pin;
 use crate::{
-    fmt, hint, mem,
+    hint, mem,
     ops::{self, Deref, DerefMut},
 };
 
@@ -1121,90 +1121,6 @@ impl<T: Clone> Option<&mut T> {
     }
 }
 
-impl<T: fmt::Debug> Option<T> {
-    /// Consumes `self` while expecting [`None`] and returning nothing.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the value is a [`Some`], with a panic message including the
-    /// passed message, and the content of the [`Some`].
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(option_expect_none)]
-    ///
-    /// use std::collections::HashMap;
-    /// let mut squares = HashMap::new();
-    /// for i in -10..=10 {
-    ///     // This will not panic, since all keys are unique.
-    ///     squares.insert(i, i * i).expect_none("duplicate key");
-    /// }
-    /// ```
-    ///
-    /// ```should_panic
-    /// #![feature(option_expect_none)]
-    ///
-    /// use std::collections::HashMap;
-    /// let mut sqrts = HashMap::new();
-    /// for i in -10..=10 {
-    ///     // This will panic, since both negative and positive `i` will
-    ///     // insert the same `i * i` key, returning the old `Some(i)`.
-    ///     sqrts.insert(i * i, i).expect_none("duplicate key");
-    /// }
-    /// ```
-    #[inline]
-    #[track_caller]
-    #[unstable(feature = "option_expect_none", reason = "newly added", issue = "62633")]
-    pub fn expect_none(self, msg: &str) {
-        if let Some(val) = self {
-            expect_none_failed(msg, &val);
-        }
-    }
-
-    /// Consumes `self` while expecting [`None`] and returning nothing.
-    ///
-    /// # Panics
-    ///
-    /// Panics if the value is a [`Some`], with a custom panic message provided
-    /// by the [`Some`]'s value.
-    ///
-    /// [`Some(v)`]: Some
-    ///
-    /// # Examples
-    ///
-    /// ```
-    /// #![feature(option_unwrap_none)]
-    ///
-    /// use std::collections::HashMap;
-    /// let mut squares = HashMap::new();
-    /// for i in -10..=10 {
-    ///     // This will not panic, since all keys are unique.
-    ///     squares.insert(i, i * i).unwrap_none();
-    /// }
-    /// ```
-    ///
-    /// ```should_panic
-    /// #![feature(option_unwrap_none)]
-    ///
-    /// use std::collections::HashMap;
-    /// let mut sqrts = HashMap::new();
-    /// for i in -10..=10 {
-    ///     // This will panic, since both negative and positive `i` will
-    ///     // insert the same `i * i` key, returning the old `Some(i)`.
-    ///     sqrts.insert(i * i, i).unwrap_none();
-    /// }
-    /// ```
-    #[inline]
-    #[track_caller]
-    #[unstable(feature = "option_unwrap_none", reason = "newly added", issue = "62633")]
-    pub fn unwrap_none(self) {
-        if let Some(val) = self {
-            expect_none_failed("called `Option::unwrap_none()` on a `Some` value", &val);
-        }
-    }
-}
-
 impl<T: Default> Option<T> {
     /// Returns the contained [`Some`] value or a default
     ///
@@ -1321,14 +1237,6 @@ fn expect_failed(msg: &str) -> ! {
     panic!("{}", msg)
 }
 
-// This is a separate function to reduce the code size of .expect_none() itself.
-#[inline(never)]
-#[cold]
-#[track_caller]
-fn expect_none_failed(msg: &str, value: &dyn fmt::Debug) -> ! {
-    panic!("{}: {:?}", msg, value)
-}
-
 /////////////////////////////////////////////////////////////////////////////
 // Trait implementations
 /////////////////////////////////////////////////////////////////////////////

library/core/src/result.rs

@@ -1167,6 +1167,42 @@ impl<T, E: Into<!>> Result<T, E> {
     }
 }
 
+#[unstable(feature = "unwrap_infallible", reason = "newly added", issue = "61695")]
+impl<T: Into<!>, E> Result<T, E> {
+    /// Returns the contained [`Err`] value, but never panics.
+    ///
+    /// Unlike [`unwrap_err`], this method is known to never panic on the
+    /// result types it is implemented for. Therefore, it can be used
+    /// instead of `unwrap_err` as a maintainability safeguard that will fail
+    /// to compile if the ok type of the `Result` is later changed
+    /// to a type that can actually occur.
+    ///
+    /// [`unwrap_err`]: Result::unwrap_err
+    ///
+    /// # Examples
+    ///
+    /// Basic usage:
+    ///
+    /// ```
+    /// # #![feature(never_type)]
+    /// # #![feature(unwrap_infallible)]
+    ///
+    /// fn only_bad_news() -> Result<!, String> {
+    ///     Err("Oops, it failed".into())
+    /// }
+    ///
+    /// let error: String = only_bad_news().into_err();
+    /// println!("{}", error);
+    /// ```
+    #[inline]
+    pub fn into_err(self) -> E {
+        match self {
+            Ok(x) => x.into(),
+            Err(e) => e,
+        }
+    }
+}
+
 impl<T: Deref, E> Result<T, E> {
     /// Converts from `Result<T, E>` (or `&Result<T, E>`) to `Result<&<T as Deref>::Target, &E>`.
     ///

library/core/tests/iter/adapters/chain.rs

@@ -174,14 +174,14 @@ fn test_iterator_chain_size_hint() {
 fn test_iterator_chain_unfused() {
     // Chain shouldn't be fused in its second iterator, depending on direction
     let mut iter = NonFused::new(empty()).chain(Toggle { is_empty: true });
-    iter.next().unwrap_none();
-    iter.next().unwrap();
-    iter.next().unwrap_none();
+    assert!(iter.next().is_none());
+    assert!(iter.next().is_some());
+    assert!(iter.next().is_none());
 
     let mut iter = Toggle { is_empty: true }.chain(NonFused::new(empty()));
-    iter.next_back().unwrap_none();
-    iter.next_back().unwrap();
-    iter.next_back().unwrap_none();
+    assert!(iter.next_back().is_none());
+    assert!(iter.next_back().is_some());
+    assert!(iter.next_back().is_none());
 }
 
 #[test]

library/core/tests/lib.rs

@@ -20,7 +20,6 @@
 #![feature(core_intrinsics)]
 #![feature(core_private_bignum)]
 #![feature(core_private_diy_float)]
-#![feature(debug_non_exhaustive)]
 #![feature(dec2flt)]
 #![feature(div_duration)]
 #![feature(duration_consts_2)]
@@ -68,7 +67,6 @@
 #![feature(unwrap_infallible)]
 #![feature(option_result_unwrap_unchecked)]
 #![feature(result_into_ok_or_err)]
-#![feature(option_unwrap_none)]
 #![feature(peekable_peek_mut)]
 #![cfg_attr(not(bootstrap), feature(ptr_metadata))]
 #![feature(once_cell)]

library/core/tests/result.rs

@@ -225,6 +225,28 @@ pub fn test_into_ok() {
     assert_eq!(infallible_op2().into_ok(), 667);
 }
 
+#[test]
+pub fn test_into_err() {
+    fn until_error_op() -> Result<!, isize> {
+        Err(666)
+    }
+
+    assert_eq!(until_error_op().into_err(), 666);
+
+    enum MyNeverToken {}
+    impl From<MyNeverToken> for ! {
+        fn from(never: MyNeverToken) -> ! {
+            match never {}
+        }
+    }
+
+    fn until_error_op2() -> Result<MyNeverToken, isize> {
+        Err(667)
+    }
+
+    assert_eq!(until_error_op2().into_err(), 667);
+}
+
 #[test]
 fn test_try() {
     fn try_result_some() -> Option<u8> {

library/test/src/lib.rs

@@ -25,7 +25,6 @@
 #![feature(nll)]
 #![feature(available_concurrency)]
 #![feature(internal_output_capture)]
-#![feature(option_unwrap_none)]
 #![feature(panic_unwind)]
 #![feature(staged_api)]
 #![feature(termination_trait_lib)]
@@ -298,8 +297,9 @@ where
             let test = remaining.pop().unwrap();
             let event = TestEvent::TeWait(test.desc.clone());
             notify_about_test_event(event)?;
-            run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::No)
-                .unwrap_none();
+            let join_handle =
+                run_test(opts, !opts.run_tests, test, run_strategy, tx.clone(), Concurrent::No);
+            assert!(join_handle.is_none());
             let completed_test = rx.recv().unwrap();
 
             let event = TestEvent::TeResult(completed_test);