Rollup of 9 pull requests

compiler/rustc_codegen_cranelift/src/abi/comments.rs

@@ -65,7 +65,7 @@ pub(super) fn add_locals_header_comment(fx: &mut FunctionCx<'_, '_, '_>) {
     if fx.clif_comments.enabled() {
         fx.add_global_comment(String::new());
         fx.add_global_comment(
-            "kind  local ty                              size align (abi,pref)".to_string(),
+            "kind  local ty                              size align (abi)".to_string(),
         );
     }
 }
@@ -84,14 +84,13 @@ pub(super) fn add_local_place_comments<'tcx>(
     let (kind, extra) = place.debug_comment();
 
     fx.add_global_comment(format!(
-        "{:<5} {:5} {:30} {:4}b {}, {}{}{}",
+        "{:<5} {:5} {:30} {:4}b {}{}{}",
         kind,
         format!("{:?}", local),
         format!("{:?}", ty),
         size.bytes(),
         align.abi.bytes(),
-        align.pref.bytes(),
-        if extra.is_empty() { "" } else { "              " },
+        if extra.is_empty() { "" } else { "                " },
         extra,
     ));
 }

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -272,7 +272,7 @@ fn data_id_for_static(
             .layout_of(ty::TypingEnv::fully_monomorphized().as_query_input(ty))
             .unwrap()
             .align
-            .pref
+            .abi
             .bytes();
 
         let linkage = if import_linkage == rustc_middle::mir::mono::Linkage::ExternalWeak

compiler/rustc_data_structures/src/intern.rs

@@ -92,7 +92,10 @@ impl<'a, T: Ord> Ord for Interned<'a, T> {
     }
 }
 
-impl<'a, T> Hash for Interned<'a, T> {
+impl<'a, T> Hash for Interned<'a, T>
+where
+    T: Hash,
+{
     #[inline]
     fn hash<H: Hasher>(&self, s: &mut H) {
         // Pointer hashing is sufficient, due to the uniqueness constraint.

compiler/rustc_driver_impl/src/signal_handler.rs

@@ -6,6 +6,15 @@ use std::{fmt, mem, ptr, slice};
 
 use rustc_interface::util::{DEFAULT_STACK_SIZE, STACK_SIZE};
 
+/// Signals that represent that we have a bug, and our prompt termination has
+/// been ordered.
+#[rustfmt::skip]
+const KILL_SIGNALS: [(libc::c_int, &str); 3] = [
+    (libc::SIGILL, "SIGILL"),
+    (libc::SIGBUS, "SIGBUS"),
+    (libc::SIGSEGV, "SIGSEGV")
+];
+
 unsafe extern "C" {
     fn backtrace_symbols_fd(buffer: *const *mut libc::c_void, size: libc::c_int, fd: libc::c_int);
 }
@@ -39,8 +48,19 @@ macro raw_errln($tokens:tt) {
 /// # Safety
 ///
 /// Caller must ensure that this function is not re-entered.
-unsafe extern "C" fn print_stack_trace(_: libc::c_int) {
+unsafe extern "C" fn print_stack_trace(signum: libc::c_int) {
     const MAX_FRAMES: usize = 256;
+
+    let signame = {
+        let mut signame = "<unknown>";
+        for sig in KILL_SIGNALS {
+            if sig.0 == signum {
+                signame = sig.1;
+            }
+        }
+        signame
+    };
+
     let stack = unsafe {
         // Reserve data segment so we don't have to malloc in a signal handler, which might fail
         // in incredibly undesirable and unexpected ways due to e.g. the allocator deadlocking
@@ -54,7 +74,8 @@ unsafe extern "C" fn print_stack_trace(_: libc::c_int) {
     };
 
     // Just a stack trace is cryptic. Explain what we're doing.
-    raw_errln!("error: rustc interrupted by SIGSEGV, printing backtrace\n");
+    raw_errln!("error: rustc interrupted by {signame}, printing backtrace\n");
+
     let mut written = 1;
     let mut consumed = 0;
     // Begin elaborating return addrs into symbols and writing them directly to stderr
@@ -94,7 +115,7 @@ unsafe extern "C" fn print_stack_trace(_: libc::c_int) {
     written += rem.len() + 1;
 
     let random_depth = || 8 * 16; // chosen by random diceroll (2d20)
-    if cyclic || stack.len() > random_depth() {
+    if (cyclic || stack.len() > random_depth()) && signum == libc::SIGSEGV {
         // technically speculation, but assert it with confidence anyway.
         // rustc only arrived in this signal handler because bad things happened
         // and this message is for explaining it's not the programmer's fault
@@ -106,17 +127,22 @@ unsafe extern "C" fn print_stack_trace(_: libc::c_int) {
         written += 1;
     }
     raw_errln!("note: we would appreciate a report at https://github.com/rust-lang/rust");
-    // get the current stack size WITHOUT blocking and double it
-    let new_size = STACK_SIZE.get().copied().unwrap_or(DEFAULT_STACK_SIZE) * 2;
-    raw_errln!("help: you can increase rustc's stack size by setting RUST_MIN_STACK={new_size}");
-    written += 2;
+    written += 1;
+    if signum == libc::SIGSEGV {
+        // get the current stack size WITHOUT blocking and double it
+        let new_size = STACK_SIZE.get().copied().unwrap_or(DEFAULT_STACK_SIZE) * 2;
+        raw_errln!(
+            "help: you can increase rustc's stack size by setting RUST_MIN_STACK={new_size}"
+        );
+        written += 1;
+    }
     if written > 24 {
-        // We probably just scrolled the earlier "we got SIGSEGV" message off the terminal
-        raw_errln!("note: backtrace dumped due to SIGSEGV! resuming signal");
+        // We probably just scrolled the earlier "interrupted by {signame}" message off the terminal
+        raw_errln!("note: backtrace dumped due to {signame}! resuming signal");
     };
 }
 
-/// When SIGSEGV is delivered to the process, print a stack trace and then exit.
+/// When one of the KILL signals is delivered to the process, print a stack trace and then exit.
 pub(super) fn install() {
     unsafe {
         let alt_stack_size: usize = min_sigstack_size() + 64 * 1024;
@@ -129,7 +155,9 @@ pub(super) fn install() {
         sa.sa_sigaction = print_stack_trace as libc::sighandler_t;
         sa.sa_flags = libc::SA_NODEFER | libc::SA_RESETHAND | libc::SA_ONSTACK;
         libc::sigemptyset(&mut sa.sa_mask);
-        libc::sigaction(libc::SIGSEGV, &sa, ptr::null_mut());
+        for (signum, _signame) in KILL_SIGNALS {
+            libc::sigaction(signum, &sa, ptr::null_mut());
+        }
     }
 }
 

compiler/rustc_middle/src/thir.rs

@@ -376,7 +376,6 @@ pub enum ExprKind<'tcx> {
     /// A `match` expression.
     Match {
         scrutinee: ExprId,
-        scrutinee_hir_id: HirId,
         arms: Box<[ArmId]>,
         match_source: MatchSource,
     },

compiler/rustc_mir_build/src/thir/cx/expr.rs

@@ -828,7 +828,6 @@ impl<'tcx> ThirBuildCx<'tcx> {
             },
             hir::ExprKind::Match(discr, arms, match_source) => ExprKind::Match {
                 scrutinee: self.mirror_expr(discr),
-                scrutinee_hir_id: discr.hir_id,
                 arms: arms.iter().map(|a| self.convert_arm(a)).collect(),
                 match_source,
             },

compiler/rustc_mir_build/src/thir/pattern/check_match.rs

@@ -151,7 +151,7 @@ impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx> {
                 }
                 return;
             }
-            ExprKind::Match { scrutinee, scrutinee_hir_id: _, box ref arms, match_source } => {
+            ExprKind::Match { scrutinee, box ref arms, match_source } => {
                 self.check_match(scrutinee, arms, match_source, ex.span);
             }
             ExprKind::Let { box ref pat, expr } => {

compiler/rustc_next_trait_solver/src/solve/alias_relate.rs

@@ -34,7 +34,17 @@ where
     ) -> QueryResult<I> {
         let cx = self.cx();
         let Goal { param_env, predicate: (lhs, rhs, direction) } = goal;
-        debug_assert!(lhs.to_alias_term().is_some() || rhs.to_alias_term().is_some());
+
+        // Check that the alias-relate goal is reasonable. Writeback for
+        // `coroutine_stalled_predicates` can replace alias terms with
+        // `{type error}` if the alias still contains infer vars, so we also
+        // accept alias-relate goals where one of the terms is an error.
+        debug_assert!(
+            lhs.to_alias_term().is_some()
+                || rhs.to_alias_term().is_some()
+                || lhs.is_error()
+                || rhs.is_error()
+        );
 
         // Structurally normalize the lhs.
         let lhs = if let Some(alias) = lhs.to_alias_term() {

compiler/rustc_resolve/src/imports.rs

@@ -182,6 +182,19 @@ pub(crate) struct ImportData<'ra> {
 /// so we can use referential equality to compare them.
 pub(crate) type Import<'ra> = Interned<'ra, ImportData<'ra>>;
 
+// Allows us to use Interned without actually enforcing (via Hash/PartialEq/...) uniqueness of the
+// contained data.
+// FIXME: We may wish to actually have at least debug-level assertions that Interned's guarantees
+// are upheld.
+impl std::hash::Hash for ImportData<'_> {
+    fn hash<H>(&self, _: &mut H)
+    where
+        H: std::hash::Hasher,
+    {
+        unreachable!()
+    }
+}
+
 impl<'ra> ImportData<'ra> {
     pub(crate) fn is_glob(&self) -> bool {
         matches!(self.kind, ImportKind::Glob { .. })

compiler/rustc_resolve/src/lib.rs

@@ -589,6 +589,19 @@ struct ModuleData<'ra> {
 #[rustc_pass_by_value]
 struct Module<'ra>(Interned<'ra, ModuleData<'ra>>);
 
+// Allows us to use Interned without actually enforcing (via Hash/PartialEq/...) uniqueness of the
+// contained data.
+// FIXME: We may wish to actually have at least debug-level assertions that Interned's guarantees
+// are upheld.
+impl std::hash::Hash for ModuleData<'_> {
+    fn hash<H>(&self, _: &mut H)
+    where
+        H: std::hash::Hasher,
+    {
+        unreachable!()
+    }
+}
+
 impl<'ra> ModuleData<'ra> {
     fn new(
         parent: Option<Module<'ra>>,
@@ -739,6 +752,19 @@ struct NameBindingData<'ra> {
 /// so we can use referential equality to compare them.
 type NameBinding<'ra> = Interned<'ra, NameBindingData<'ra>>;
 
+// Allows us to use Interned without actually enforcing (via Hash/PartialEq/...) uniqueness of the
+// contained data.
+// FIXME: We may wish to actually have at least debug-level assertions that Interned's guarantees
+// are upheld.
+impl std::hash::Hash for NameBindingData<'_> {
+    fn hash<H>(&self, _: &mut H)
+    where
+        H: std::hash::Hasher,
+    {
+        unreachable!()
+    }
+}
+
 trait ToNameBinding<'ra> {
     fn to_name_binding(self, arenas: &'ra ResolverArenas<'ra>) -> NameBinding<'ra>;
 }

compiler/rustc_span/src/symbol.rs

@@ -192,6 +192,7 @@ symbols! {
         Capture,
         Cell,
         Center,
+        Child,
         Cleanup,
         Clone,
         CoercePointee,
@@ -336,6 +337,7 @@ symbols! {
         SliceIter,
         Some,
         SpanCtxt,
+        Stdin,
         String,
         StructuralPartialEq,
         SubdiagMessage,
@@ -599,6 +601,9 @@ symbols! {
         cfi,
         cfi_encoding,
         char,
+        char_is_ascii,
+        child_id,
+        child_kill,
         client,
         clippy,
         clobber_abi,
@@ -1468,6 +1473,7 @@ symbols! {
         panic_2015,
         panic_2021,
         panic_abort,
+        panic_any,
         panic_bounds_check,
         panic_cannot_unwind,
         panic_const_add_overflow,
@@ -1573,6 +1579,7 @@ symbols! {
         proc_macro_mod,
         proc_macro_non_items,
         proc_macro_path_invoc,
+        process_abort,
         process_exit,
         profiler_builtins,
         profiler_runtime,

compiler/rustc_type_ir/src/inherent.rs

@@ -126,6 +126,10 @@ pub trait Ty<I: Interner<Ty = Self>>:
         matches!(self.kind(), ty::Infer(ty::TyVar(_)))
     }
 
+    fn is_ty_error(self) -> bool {
+        matches!(self.kind(), ty::Error(_))
+    }
+
     fn is_floating_point(self) -> bool {
         matches!(self.kind(), ty::Float(_) | ty::Infer(ty::FloatVar(_)))
     }
@@ -284,6 +288,10 @@ pub trait Const<I: Interner<Const = Self>>:
     fn is_ct_var(self) -> bool {
         matches!(self.kind(), ty::ConstKind::Infer(ty::InferConst::Var(_)))
     }
+
+    fn is_ct_error(self) -> bool {
+        matches!(self.kind(), ty::ConstKind::Error(_))
+    }
 }
 
 pub trait ValueConst<I: Interner<ValueConst = Self>>: Copy + Debug + Hash + Eq {
@@ -370,6 +378,13 @@ pub trait Term<I: Interner<Term = Self>>:
         }
     }
 
+    fn is_error(self) -> bool {
+        match self.kind() {
+            ty::TermKind::Ty(ty) => ty.is_ty_error(),
+            ty::TermKind::Const(ct) => ct.is_ct_error(),
+        }
+    }
+
     fn to_alias_term(self) -> Option<ty::AliasTerm<I>> {
         match self.kind() {
             ty::TermKind::Ty(ty) => match ty.kind() {

library/core/src/char/methods.rs

@@ -1168,6 +1168,7 @@ impl char {
     #[must_use]
     #[stable(feature = "ascii_methods_on_intrinsics", since = "1.23.0")]
     #[rustc_const_stable(feature = "const_char_is_ascii", since = "1.32.0")]
+    #[cfg_attr(not(test), rustc_diagnostic_item = "char_is_ascii")]
     #[inline]
     pub const fn is_ascii(&self) -> bool {
         *self as u32 <= 0x7F

library/core/src/ub_checks.rs

@@ -65,9 +65,9 @@ macro_rules! assert_unsafe_precondition {
             #[rustc_nounwind]
             const fn precondition_check($($name:$ty),*) {
                 if !$e {
-                    ::core::panicking::panic_nounwind(
-                        concat!("unsafe precondition(s) violated: ", $message)
-                    );
+                    ::core::panicking::panic_nounwind(concat!("unsafe precondition(s) violated: ", $message,
+                        "\n\nThis indicates a bug in the program. \
+                        This Undefined Behavior check is optional, and cannot be relied on for safety."));
                 }
             }
 

library/std/src/f16.rs

@@ -1321,12 +1321,14 @@ impl f16 {
     /// ```
     /// #![feature(f16)]
     /// #![feature(float_erf)]
+    /// # #[cfg(reliable_f16_math)] {
     /// let x: f16 = 0.123;
     ///
     /// let one = x.erf() + x.erfc();
     /// let abs_difference = (one - 1.0).abs();
     ///
     /// assert!(abs_difference <= f16::EPSILON);
+    /// # }
     /// ```
     #[rustc_allow_incoherent_impl]
     #[must_use = "method returns a new number and does not mutate the original value"]

library/std/src/io/stdio.rs

@@ -239,6 +239,7 @@ fn handle_ebadf_lazy<T>(r: io::Result<T>, default: impl FnOnce() -> T) -> io::Re
 /// }
 /// ```
 #[stable(feature = "rust1", since = "1.0.0")]
+#[cfg_attr(not(test), rustc_diagnostic_item = "Stdin")]
 pub struct Stdin {
     inner: &'static Mutex<BufReader<StdinRaw>>,
 }

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

@@ -162,13 +162,6 @@ pub trait FileExt {
         Ok(())
     }
 
-    /// Returns the current position within the file.
-    ///
-    /// This corresponds to the `fd_tell` syscall and is similar to
-    /// `seek` where you offset 0 bytes from the current position.
-    #[doc(alias = "fd_tell")]
-    fn tell(&self) -> io::Result<u64>;
-
     /// Adjusts the flags associated with this file.
     ///
     /// This corresponds to the `fd_fdstat_set_flags` syscall.
@@ -240,10 +233,6 @@ impl FileExt for fs::File {
         self.as_inner().as_inner().pwrite(bufs, offset)
     }
 
-    fn tell(&self) -> io::Result<u64> {
-        self.as_inner().as_inner().tell()
-    }
-
     fn fdstat_set_flags(&self, flags: u16) -> io::Result<()> {
         self.as_inner().as_inner().set_flags(flags)
     }