Auto merge of #83573 - JohnTitor:rollup-28jnzsr, r=JohnTitor

Rollup of 10 pull requests

Successful merges:

 - #79399 (Use detailed and shorter fs error explaination)
 - #83348 (format macro argument parsing fix)
 - #83462 (ExitStatus: print "exit status: {}" rather than "exit code: {}" on unix)
 - #83526 (lazily calls some fns)
 - #83558 (Use DebugStruct::finish_non_exhaustive() in std.)
 - #83559 (Fix Debug implementation for RwLock{Read,Write}Guard.)
 - #83560 (Derive Debug for io::Chain instead of manually implementing it.)
 - #83561 (Improve Debug implementations of Mutex and RwLock.)
 - #83567 (Update rustup cross-compilation docs link)
 - #83569 (Add regression tests for #56445)

Failed merges:

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

compiler/rustc_errors/src/json.rs

@@ -493,7 +493,7 @@ impl DiagnosticSpanLine {
         h_end: usize,
     ) -> DiagnosticSpanLine {
         DiagnosticSpanLine {
-            text: sf.get_line(index).map_or(String::new(), |l| l.into_owned()),
+            text: sf.get_line(index).map_or_else(String::new, |l| l.into_owned()),
             highlight_start: h_start,
             highlight_end: h_end,
         }

compiler/rustc_middle/src/ty/instance.rs

@@ -216,9 +216,10 @@ impl<'tcx> InstanceDef<'tcx> {
             // drops of `Option::None` before LTO. We also respect the intent of
             // `#[inline]` on `Drop::drop` implementations.
             return ty.ty_adt_def().map_or(true, |adt_def| {
-                adt_def.destructor(tcx).map_or(adt_def.is_enum(), |dtor| {
-                    tcx.codegen_fn_attrs(dtor.did).requests_inline()
-                })
+                adt_def.destructor(tcx).map_or_else(
+                    || adt_def.is_enum(),
+                    |dtor| tcx.codegen_fn_attrs(dtor.did).requests_inline(),
+                )
             });
         }
         tcx.codegen_fn_attrs(self.def_id()).requests_inline()

compiler/rustc_middle/src/ty/query/on_disk_cache.rs

@@ -525,7 +525,7 @@ impl<'sess> OnDiskCache<'sess> {
     ) {
         let mut current_diagnostics = self.current_diagnostics.borrow_mut();
 
-        let x = current_diagnostics.entry(dep_node_index).or_insert(Vec::new());
+        let x = current_diagnostics.entry(dep_node_index).or_default();
 
         x.extend(Into::<Vec<_>>::into(diagnostics));
     }

compiler/rustc_mir/src/borrow_check/diagnostics/outlives_suggestion.rs

@@ -157,7 +157,7 @@ impl OutlivesSuggestionBuilder {
         debug!("Collected {:?}: {:?}", fr, outlived_fr);
 
         // Add to set of constraints for final help note.
-        self.constraints_to_add.entry(fr).or_insert(Vec::new()).push(outlived_fr);
+        self.constraints_to_add.entry(fr).or_default().push(outlived_fr);
     }
 
     /// Emit an intermediate note on the given `Diagnostic` if the involved regions are

compiler/rustc_parse_format/src/lib.rs

@@ -213,11 +213,13 @@ impl<'a> Iterator for Parser<'a> {
                         Some(String(self.string(pos + 1)))
                     } else {
                         let arg = self.argument();
-                        if let Some(end) = self.must_consume('}') {
-                            let start = self.to_span_index(pos);
-                            let end = self.to_span_index(end + 1);
+                        if let Some(rbrace_byte_idx) = self.must_consume('}') {
+                            let lbrace_inner_offset = self.to_span_index(pos);
+                            let rbrace_inner_offset = self.to_span_index(rbrace_byte_idx);
                             if self.is_literal {
-                                self.arg_places.push(start.to(end));
+                                self.arg_places.push(
+                                    lbrace_inner_offset.to(InnerOffset(rbrace_inner_offset.0 + 1)),
+                                );
                             }
                         }
                         Some(NextArgument(arg))

compiler/rustc_resolve/src/late.rs

@@ -2327,7 +2327,7 @@ impl<'a: 'ast, 'b, 'ast> LateResolutionVisitor<'a, 'b, 'ast> {
 
             ExprKind::Call(ref callee, ref arguments) => {
                 self.resolve_expr(callee, Some(expr));
-                let const_args = self.r.legacy_const_generic_args(callee).unwrap_or(Vec::new());
+                let const_args = self.r.legacy_const_generic_args(callee).unwrap_or_default();
                 for (idx, argument) in arguments.iter().enumerate() {
                     // Constant arguments need to be treated as AnonConst since
                     // that is how they will be later lowered to HIR.

compiler/rustc_resolve/src/late/diagnostics.rs

@@ -184,7 +184,7 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                         PathResult::Module(ModuleOrUniformRoot::Module(module)) => module.res(),
                         _ => None,
                     }
-                    .map_or(String::new(), |res| format!("{} ", res.descr()));
+                    .map_or_else(String::new, |res| format!("{} ", res.descr()));
                 (mod_prefix, format!("`{}`", Segment::names_to_string(mod_path)))
             };
             (
@@ -1042,10 +1042,10 @@ impl<'a: 'ast, 'ast> LateResolutionVisitor<'a, '_, 'ast> {
                 if let Some(span) = self.def_span(def_id) {
                     err.span_label(span, &format!("`{}` defined here", path_str));
                 }
-                let fields =
-                    self.r.field_names.get(&def_id).map_or("/* fields */".to_string(), |fields| {
-                        vec!["_"; fields.len()].join(", ")
-                    });
+                let fields = self.r.field_names.get(&def_id).map_or_else(
+                    || "/* fields */".to_string(),
+                    |fields| vec!["_"; fields.len()].join(", "),
+                );
                 err.span_suggestion(
                     span,
                     "use the tuple variant pattern syntax instead",

library/std/src/collections/hash/map.rs

@@ -1793,7 +1793,7 @@ impl<'a, K, V, S> RawVacantEntryMut<'a, K, V, S> {
 #[unstable(feature = "hash_raw_entry", issue = "56167")]
 impl<K, V, S> Debug for RawEntryBuilderMut<'_, K, V, S> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("RawEntryBuilder").finish()
+        f.debug_struct("RawEntryBuilder").finish_non_exhaustive()
     }
 }
 
@@ -1813,21 +1813,21 @@ impl<K: Debug, V: Debug, S> Debug for RawOccupiedEntryMut<'_, K, V, S> {
         f.debug_struct("RawOccupiedEntryMut")
             .field("key", self.key())
             .field("value", self.get())
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 
 #[unstable(feature = "hash_raw_entry", issue = "56167")]
 impl<K, V, S> Debug for RawVacantEntryMut<'_, K, V, S> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("RawVacantEntryMut").finish()
+        f.debug_struct("RawVacantEntryMut").finish_non_exhaustive()
     }
 }
 
 #[unstable(feature = "hash_raw_entry", issue = "56167")]
 impl<K, V, S> Debug for RawEntryBuilder<'_, K, V, S> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("RawEntryBuilder").finish()
+        f.debug_struct("RawEntryBuilder").finish_non_exhaustive()
     }
 }
 
@@ -1867,7 +1867,10 @@ pub struct OccupiedEntry<'a, K: 'a, V: 'a> {
 #[stable(feature = "debug_hash_map", since = "1.12.0")]
 impl<K: Debug, V: Debug> Debug for OccupiedEntry<'_, K, V> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("OccupiedEntry").field("key", self.key()).field("value", self.get()).finish()
+        f.debug_struct("OccupiedEntry")
+            .field("key", self.key())
+            .field("value", self.get())
+            .finish_non_exhaustive()
     }
 }
 
@@ -1903,7 +1906,7 @@ impl<K: Debug, V: Debug> Debug for OccupiedError<'_, K, V> {
             .field("key", self.entry.key())
             .field("old_value", self.entry.get())
             .field("new_value", &self.value)
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 

library/std/src/fs.rs

@@ -1154,7 +1154,7 @@ impl fmt::Debug for Metadata {
             .field("modified", &self.modified())
             .field("accessed", &self.accessed())
             .field("created", &self.created())
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 
@@ -1677,9 +1677,9 @@ pub fn rename<P: AsRef<Path>, Q: AsRef<Path>>(from: P, to: Q) -> io::Result<()>
 /// This function will return an error in the following situations, but is not
 /// limited to just these cases:
 ///
-/// * The `from` path is not a file.
-/// * The `from` file does not exist.
-/// * The current process does not have the permission rights to access
+/// * `from` is neither a regular file nor a symlink to a regular file.
+/// * `from` does not exist.
+/// * The current process does not have the permission rights to read
 ///   `from` or write `to`.
 ///
 /// # Examples

library/std/src/io/buffered/linewriter.rs

@@ -227,6 +227,6 @@ where
                 "buffer",
                 &format_args!("{}/{}", self.inner.buffer().len(), self.inner.capacity()),
             )
-            .finish()
+            .finish_non_exhaustive()
     }
 }

library/std/src/io/mod.rs

@@ -2114,6 +2114,7 @@ pub trait BufRead: Read {
 ///
 /// [`chain`]: Read::chain
 #[stable(feature = "rust1", since = "1.0.0")]
+#[derive(Debug)]
 pub struct Chain<T, U> {
     first: T,
     second: U,
@@ -2195,13 +2196,6 @@ impl<T, U> Chain<T, U> {
     }
 }
 
-#[stable(feature = "std_debug", since = "1.16.0")]
-impl<T: fmt::Debug, U: fmt::Debug> fmt::Debug for Chain<T, U> {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Chain").field("t", &self.first).field("u", &self.second).finish()
-    }
-}
-
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: Read, U: Read> Read for Chain<T, U> {
     fn read(&mut self, buf: &mut [u8]) -> Result<usize> {

library/std/src/lazy.rs

@@ -515,7 +515,7 @@ pub struct SyncLazy<T, F = fn() -> T> {
 #[unstable(feature = "once_cell", issue = "74465")]
 impl<T: fmt::Debug, F> fmt::Debug for SyncLazy<T, F> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Lazy").field("cell", &self.cell).field("init", &"..").finish()
+        f.debug_struct("Lazy").field("cell", &self.cell).finish_non_exhaustive()
     }
 }
 

library/std/src/process.rs

@@ -234,7 +234,7 @@ impl fmt::Debug for Child {
             .field("stdin", &self.stdin)
             .field("stdout", &self.stdout)
             .field("stderr", &self.stderr)
-            .finish()
+            .finish_non_exhaustive()
     }
 }
 

library/std/src/sync/mpsc/mod.rs

@@ -864,7 +864,7 @@ impl<T> Drop for Sender<T> {
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for Sender<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Sender").finish()
+        f.debug_struct("Sender").finish_non_exhaustive()
     }
 }
 
@@ -991,7 +991,7 @@ impl<T> Drop for SyncSender<T> {
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for SyncSender<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("SyncSender").finish()
+        f.debug_struct("SyncSender").finish_non_exhaustive()
     }
 }
 
@@ -1470,7 +1470,7 @@ impl<T> Drop for Receiver<T> {
 #[stable(feature = "mpsc_debug", since = "1.8.0")]
 impl<T> fmt::Debug for Receiver<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Receiver").finish()
+        f.debug_struct("Receiver").finish_non_exhaustive()
     }
 }
 

library/std/src/sync/mutex.rs

@@ -441,10 +441,13 @@ impl<T: ?Sized + Default> Default for Mutex<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut d = f.debug_struct("Mutex");
         match self.try_lock() {
-            Ok(guard) => f.debug_struct("Mutex").field("data", &&*guard).finish(),
+            Ok(guard) => {
+                d.field("data", &&*guard);
+            }
             Err(TryLockError::Poisoned(err)) => {
-                f.debug_struct("Mutex").field("data", &&**err.get_ref()).finish()
+                d.field("data", &&**err.get_ref());
             }
             Err(TryLockError::WouldBlock) => {
                 struct LockedPlaceholder;
@@ -453,10 +456,11 @@ impl<T: ?Sized + fmt::Debug> fmt::Debug for Mutex<T> {
                         f.write_str("<locked>")
                     }
                 }
-
-                f.debug_struct("Mutex").field("data", &LockedPlaceholder).finish()
+                d.field("data", &LockedPlaceholder);
             }
         }
+        d.field("poisoned", &self.poison.get());
+        d.finish_non_exhaustive()
     }
 }
 

library/std/src/sync/rwlock.rs

@@ -422,10 +422,13 @@ unsafe impl<#[may_dangle] T: ?Sized> Drop for RwLock<T> {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl<T: ?Sized + fmt::Debug> fmt::Debug for RwLock<T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let mut d = f.debug_struct("RwLock");
         match self.try_read() {
-            Ok(guard) => f.debug_struct("RwLock").field("data", &&*guard).finish(),
+            Ok(guard) => {
+                d.field("data", &&*guard);
+            }
             Err(TryLockError::Poisoned(err)) => {
-                f.debug_struct("RwLock").field("data", &&**err.get_ref()).finish()
+                d.field("data", &&**err.get_ref());
             }
             Err(TryLockError::WouldBlock) => {
                 struct LockedPlaceholder;
@@ -434,10 +437,11 @@ impl<T: ?Sized + fmt::Debug> fmt::Debug for RwLock<T> {
                         f.write_str("<locked>")
                     }
                 }
-
-                f.debug_struct("RwLock").field("data", &LockedPlaceholder).finish()
+                d.field("data", &LockedPlaceholder);
             }
         }
+        d.field("poisoned", &self.poison.get());
+        d.finish_non_exhaustive()
     }
 }
 
@@ -473,7 +477,7 @@ impl<'rwlock, T: ?Sized> RwLockWriteGuard<'rwlock, T> {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<T: fmt::Debug> fmt::Debug for RwLockReadGuard<'_, T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("RwLockReadGuard").field("lock", &self.lock).finish()
+        (**self).fmt(f)
     }
 }
 
@@ -487,7 +491,7 @@ impl<T: ?Sized + fmt::Display> fmt::Display for RwLockReadGuard<'_, T> {
 #[stable(feature = "std_debug", since = "1.16.0")]
 impl<T: fmt::Debug> fmt::Debug for RwLockWriteGuard<'_, T> {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("RwLockWriteGuard").field("lock", &self.lock).finish()
+        (**self).fmt(f)
     }
 }
 

library/std/src/sys/unix/process/process_unix.rs

@@ -535,7 +535,7 @@ impl From<c_int> for ExitStatus {
 impl fmt::Display for ExitStatus {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         if let Some(code) = self.code() {
-            write!(f, "exit code: {}", code)
+            write!(f, "exit status: {}", code)
         } else if let Some(signal) = self.signal() {
             if self.core_dumped() {
                 write!(f, "signal: {} (core dumped)", signal)

library/std/src/sys/unix/process/process_unix/tests.rs

@@ -9,8 +9,8 @@ fn exitstatus_display_tests() {
 
     t(0x0000f, "signal: 15");
     t(0x0008b, "signal: 11 (core dumped)");
-    t(0x00000, "exit code: 0");
-    t(0x0ff00, "exit code: 255");
+    t(0x00000, "exit status: 0");
+    t(0x0ff00, "exit status: 255");
 
     // On MacOS, 0x0137f is WIFCONTINUED, not WIFSTOPPED.  Probably *BSD is similar.
     //   https://github.com/rust-lang/rust/pull/82749#issuecomment-790525956

library/std/src/sys/wasi/fs.rs

@@ -130,7 +130,7 @@ impl FileType {
 
 impl fmt::Debug for ReadDir {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("ReadDir").finish()
+        f.debug_struct("ReadDir").finish_non_exhaustive()
     }
 }
 

library/std/src/thread/mod.rs

@@ -1176,7 +1176,10 @@ impl Thread {
 #[stable(feature = "rust1", since = "1.0.0")]
 impl fmt::Debug for Thread {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Thread").field("id", &self.id()).field("name", &self.name()).finish()
+        f.debug_struct("Thread")
+            .field("id", &self.id())
+            .field("name", &self.name())
+            .finish_non_exhaustive()
     }
 }
 

library/test/src/helpers/exit_code.rs

@@ -4,7 +4,7 @@ use std::process::ExitStatus;
 
 #[cfg(not(unix))]
 pub fn get_exit_code(status: ExitStatus) -> Result<i32, String> {
-    status.code().ok_or("received no exit code from child process".into())
+    status.code().ok_or_else(|| "received no exit code from child process".into())
 }
 
 #[cfg(unix)]

src/doc/rustc/src/targets/built-in.md

@@ -12,4 +12,4 @@ library built by the official Rust distributions. Most targets will need a
 system linker, and possibly other things.
 
 [rustup]: https://github.com/rust-lang/rustup
-[rustup-cross]: https://github.com/rust-lang/rustup#cross-compilation
+[rustup-cross]: https://rust-lang.github.io/rustup/cross-compilation.html

src/test/ui/const-generics/issues/issue-56445.full.stderr → src/test/ui/const-generics/issues/issue-56445-1.full.stderr

@@ -1,5 +1,5 @@
 warning: the feature `const_generics` is incomplete and may not be safe to use and/or cause compiler crashes
-  --> $DIR/issue-56445.rs:3:27
+  --> $DIR/issue-56445-1.rs:3:27
    |
 LL | #![cfg_attr(full, feature(const_generics))]
    |                           ^^^^^^^^^^^^^^
@@ -8,7 +8,7 @@ LL | #![cfg_attr(full, feature(const_generics))]
    = note: see issue #44580 <https://github.com/rust-lang/rust/issues/44580> for more information
 
 error[E0771]: use of non-static lifetime `'a` in const generic
-  --> $DIR/issue-56445.rs:8:26
+  --> $DIR/issue-56445-1.rs:8:26
    |
 LL | struct Bug<'a, const S: &'a str>(PhantomData<&'a ()>);
    |                          ^^