Rollup of 7 pull requests

compiler/rustc_borrowck/src/diagnostics/conflict_errors.rs

@@ -7,7 +7,7 @@ use rustc_errors::{
 };
 use rustc_hir as hir;
 use rustc_hir::intravisit::{walk_block, walk_expr, Visitor};
-use rustc_hir::{AsyncGeneratorKind, GeneratorKind};
+use rustc_hir::{AsyncGeneratorKind, GeneratorKind, LangItem};
 use rustc_infer::infer::TyCtxtInferExt;
 use rustc_infer::traits::ObligationCause;
 use rustc_middle::mir::tcx::PlaceTy;
@@ -601,7 +601,7 @@ impl<'cx, 'tcx> MirBorrowckCtxt<'cx, 'tcx> {
         else { return; };
         // Try to find predicates on *generic params* that would allow copying `ty`
         let infcx = tcx.infer_ctxt().build();
-        let copy_did = infcx.tcx.lang_items().copy_trait().unwrap();
+        let copy_did = infcx.tcx.require_lang_item(LangItem::Copy, Some(span));
         let cause = ObligationCause::new(
             span,
             self.mir_hir_id(),

compiler/rustc_const_eval/src/transform/check_consts/ops.rs

@@ -1,7 +1,7 @@
 //! Concrete error types for all operations which may be invalid in a certain const context.
 
 use hir::def_id::LocalDefId;
-use hir::ConstContext;
+use hir::{ConstContext, LangItem};
 use rustc_errors::{
     error_code, struct_span_err, Applicability, DiagnosticBuilder, ErrorGuaranteed,
 };
@@ -304,7 +304,7 @@ impl<'tcx> NonConstOp<'tcx> for FnCallNonConst<'tcx> {
                     err.span_note(deref_target, "deref defined here");
                 }
 
-                diag_trait(&mut err, self_ty, tcx.lang_items().deref_trait().unwrap());
+                diag_trait(&mut err, self_ty, tcx.require_lang_item(LangItem::Deref, Some(span)));
                 err
             }
             _ if tcx.opt_parent(callee) == tcx.get_diagnostic_item(sym::ArgumentV1Methods) => {

compiler/rustc_const_eval/src/util/call_kind.rs

@@ -3,7 +3,7 @@
 //! context.
 
 use rustc_hir::def_id::DefId;
-use rustc_hir::lang_items;
+use rustc_hir::{lang_items, LangItem};
 use rustc_middle::ty::subst::SubstsRef;
 use rustc_middle::ty::{self, AssocItemContainer, DefIdTree, Instance, ParamEnv, Ty, TyCtxt};
 use rustc_span::symbol::Ident;
@@ -26,7 +26,7 @@ impl CallDesugaringKind {
         match self {
             Self::ForLoopIntoIter => tcx.get_diagnostic_item(sym::IntoIterator).unwrap(),
             Self::QuestionBranch | Self::TryBlockFromOutput => {
-                tcx.lang_items().try_trait().unwrap()
+                tcx.require_lang_item(LangItem::Try, None)
             }
             Self::QuestionFromResidual => tcx.get_diagnostic_item(sym::FromResidual).unwrap(),
         }

compiler/rustc_hir_analysis/src/coherence/builtin.rs

@@ -114,7 +114,7 @@ fn visit_implementation_of_copy(tcx: TyCtxt<'_>, impl_did: LocalDefId) {
                     traits::ObligationCause::dummy_with_span(field_ty_span),
                     param_env,
                     ty,
-                    tcx.lang_items().copy_trait().unwrap(),
+                    tcx.require_lang_item(LangItem::Copy, Some(span)),
                 ) {
                     let error_predicate = error.obligation.predicate;
                     // Only note if it's not the root obligation, otherwise it's trivial and

compiler/rustc_hir_typeck/src/expr.rs

@@ -1118,7 +1118,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let lhs_deref_ty_is_sized = self
                     .infcx
                     .type_implements_trait(
-                        self.tcx.lang_items().sized_trait().unwrap(),
+                        self.tcx.require_lang_item(LangItem::Sized, None),
                         [lhs_deref_ty],
                         self.param_env,
                     )

compiler/rustc_middle/src/ty/closure.rs

@@ -5,6 +5,7 @@ use crate::{mir, ty};
 
 use std::fmt::Write;
 
+use hir::LangItem;
 use rustc_data_structures::fx::{FxHashMap, FxIndexMap};
 use rustc_hir as hir;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -130,11 +131,14 @@ impl<'tcx> ClosureKind {
     }
 
     pub fn to_def_id(&self, tcx: TyCtxt<'_>) -> DefId {
-        match self {
-            ClosureKind::Fn => tcx.lang_items().fn_once_trait().unwrap(),
-            ClosureKind::FnMut => tcx.lang_items().fn_mut_trait().unwrap(),
-            ClosureKind::FnOnce => tcx.lang_items().fn_trait().unwrap(),
-        }
+        tcx.require_lang_item(
+            match self {
+                ClosureKind::Fn => LangItem::Fn,
+                ClosureKind::FnMut => LangItem::FnMut,
+                ClosureKind::FnOnce => LangItem::FnOnce,
+            },
+            None,
+        )
     }
 }
 

compiler/rustc_middle/src/ty/context.rs

@@ -2293,7 +2293,7 @@ impl<'tcx> TyCtxt<'tcx> {
     /// Given a `ty`, return whether it's an `impl Future<...>`.
     pub fn ty_is_opaque_future(self, ty: Ty<'_>) -> bool {
         let ty::Opaque(def_id, _) = ty.kind() else { return false };
-        let future_trait = self.lang_items().future_trait().unwrap();
+        let future_trait = self.require_lang_item(LangItem::Future, None);
 
         self.explicit_item_bounds(def_id).iter().any(|(predicate, _)| {
             let ty::PredicateKind::Trait(trait_predicate) = predicate.kind().skip_binder() else {

compiler/rustc_middle/src/ty/print/pretty.rs

@@ -11,6 +11,7 @@ use rustc_hir as hir;
 use rustc_hir::def::{self, CtorKind, DefKind, Namespace};
 use rustc_hir::def_id::{DefId, DefIdSet, CRATE_DEF_ID, LOCAL_CRATE};
 use rustc_hir::definitions::{DefPathData, DefPathDataName, DisambiguatedDefPathData};
+use rustc_hir::LangItem;
 use rustc_session::config::TrimmedDefPaths;
 use rustc_session::cstore::{ExternCrate, ExternCrateSource};
 use rustc_session::Limit;
@@ -889,7 +890,7 @@ pub trait PrettyPrinter<'tcx>:
                                 // Group the return ty with its def id, if we had one.
                                 entry
                                     .return_ty
-                                    .map(|ty| (tcx.lang_items().fn_once_output().unwrap(), ty)),
+                                    .map(|ty| (tcx.require_lang_item(LangItem::FnOnce, None), ty)),
                             );
                         }
                         if let Some(trait_ref) = entry.fn_mut_trait_ref {

compiler/rustc_middle/src/ty/sty.rs

@@ -17,6 +17,7 @@ use rustc_data_structures::captures::Captures;
 use rustc_data_structures::intern::Interned;
 use rustc_hir as hir;
 use rustc_hir::def_id::DefId;
+use rustc_hir::LangItem;
 use rustc_index::vec::Idx;
 use rustc_macros::HashStable;
 use rustc_span::symbol::{kw, sym, Symbol};
@@ -2108,7 +2109,7 @@ impl<'tcx> Ty<'tcx> {
 
             ty::Str | ty::Slice(_) => (tcx.types.usize, false),
             ty::Dynamic(..) => {
-                let dyn_metadata = tcx.lang_items().dyn_metadata().unwrap();
+                let dyn_metadata = tcx.require_lang_item(LangItem::DynMetadata, None);
                 (tcx.bound_type_of(dyn_metadata).subst(tcx, &[tail.into()]), false)
             },
 

compiler/rustc_target/src/spec/aix_base.rs

@@ -0,0 +1,32 @@
+use crate::abi::Endian;
+use crate::spec::{crt_objects, cvs, Cc, CodeModel, LinkOutputKind, LinkerFlavor, TargetOptions};
+
+pub fn opts() -> TargetOptions {
+    TargetOptions {
+        abi: "vec-extabi".into(),
+        code_model: Some(CodeModel::Small),
+        cpu: "pwr7".into(),
+        os: "aix".into(),
+        vendor: "ibm".into(),
+        dynamic_linking: true,
+        endian: Endian::Big,
+        executables: true,
+        archive_format: "aix_big".into(),
+        families: cvs!["unix"],
+        has_rpath: false,
+        has_thread_local: true,
+        crt_static_respected: true,
+        linker_flavor: LinkerFlavor::Unix(Cc::No),
+        linker: Some("ld".into()),
+        eh_frame_header: false,
+        is_like_aix: true,
+        default_dwarf_version: 3,
+        function_sections: true,
+        pre_link_objects: crt_objects::new(&[
+            (LinkOutputKind::DynamicNoPicExe, &["/usr/lib/crt0_64.o", "/usr/lib/crti_64.o"]),
+            (LinkOutputKind::DynamicPicExe, &["/usr/lib/crt0_64.o", "/usr/lib/crti_64.o"]),
+        ]),
+        dll_suffix: ".a".into(),
+        ..Default::default()
+    }
+}

compiler/rustc_target/src/spec/mod.rs

@@ -58,6 +58,7 @@ use rustc_macros::HashStable_Generic;
 pub mod abi;
 pub mod crt_objects;
 
+mod aix_base;
 mod android_base;
 mod apple_base;
 mod avr_gnu_base;
@@ -1027,6 +1028,7 @@ supported_targets! {
     ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
     ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
     ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
+    ("powerpc64-ibm-aix", powerpc64_ibm_aix),
     ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
     ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
     ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
@@ -1454,6 +1456,9 @@ pub struct TargetOptions {
     pub families: StaticCow<[StaticCow<str>]>,
     /// Whether the target toolchain's ABI supports returning small structs as an integer.
     pub abi_return_struct_as_int: bool,
+    /// Whether the target toolchain is like AIX's. Linker options on AIX are special and it uses
+    /// XCOFF as binary format. Defaults to false.
+    pub is_like_aix: bool,
     /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
     /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
     /// Also indiates whether to use Apple-specific ABI changes, such as extending function
@@ -1817,6 +1822,7 @@ impl Default for TargetOptions {
             staticlib_suffix: ".a".into(),
             families: cvs![],
             abi_return_struct_as_int: false,
+            is_like_aix: false,
             is_like_osx: false,
             is_like_solaris: false,
             is_like_windows: false,
@@ -2488,6 +2494,7 @@ impl Target {
         key!(staticlib_suffix);
         key!(families, TargetFamilies);
         key!(abi_return_struct_as_int, bool);
+        key!(is_like_aix, bool);
         key!(is_like_osx, bool);
         key!(is_like_solaris, bool);
         key!(is_like_windows, bool);
@@ -2741,6 +2748,7 @@ impl ToJson for Target {
         target_option_val!(staticlib_suffix);
         target_option_val!(families, "target-family");
         target_option_val!(abi_return_struct_as_int);
+        target_option_val!(is_like_aix);
         target_option_val!(is_like_osx);
         target_option_val!(is_like_solaris);
         target_option_val!(is_like_windows);

compiler/rustc_target/src/spec/powerpc64_ibm_aix.rs

@@ -0,0 +1,23 @@
+use crate::spec::{Cc, LinkerFlavor, Target};
+
+pub fn target() -> Target {
+    let mut base = super::aix_base::opts();
+    base.max_atomic_width = Some(64);
+    base.add_pre_link_args(
+        LinkerFlavor::Unix(Cc::No),
+        &[
+            "-b64".into(),
+            "-bpT:0x100000000".into(),
+            "-bpD:0x110000000".into(),
+            "-bcdtors:all:0:s".into(),
+        ],
+    );
+
+    Target {
+        llvm_target: "powerpc64-ibm-aix".into(),
+        pointer_width: 64,
+        data_layout: "E-m:a-i64:64-n32:64-S128-v256:256:256-v512:512:512".into(),
+        arch: "powerpc64".into(),
+        options: base,
+    }
+}

compiler/rustc_trait_selection/src/traits/error_reporting/suggestions.rs

@@ -2625,7 +2625,7 @@ impl<'tcx> TypeErrCtxtExt<'tcx> for TypeErrCtxt<'_, 'tcx> {
                     }
                 };
 
-                let from_generator = tcx.lang_items().from_generator_fn().unwrap();
+                let from_generator = tcx.require_lang_item(LangItem::FromGenerator, None);
 
                 // Don't print the tuple of capture types
                 'print: {

library/std/src/thread/local.rs

@@ -181,7 +181,8 @@ macro_rules! thread_local {
 macro_rules! __thread_local_inner {
     // used to generate the `LocalKey` value for const-initialized thread locals
     (@key $t:ty, const $init:expr) => {{
-        #[cfg_attr(not(windows), inline)] // see comments below
+        #[cfg_attr(not(all(windows, target_thread_local)), inline)] // see comments below
+        #[cfg_attr(all(windows, target_thread_local), inline(never))]
         #[deny(unsafe_op_in_unsafe_fn)]
         unsafe fn __getit(
             _init: $crate::option::Option<&mut $crate::option::Option<$t>>,
@@ -294,12 +295,17 @@ macro_rules! __thread_local_inner {
             fn __init() -> $t { $init }
 
             // When reading this function you might ask "why is this inlined
-            // everywhere other than Windows?", and that's a very reasonable
-            // question to ask. The short story is that it segfaults rustc if
-            // this function is inlined. The longer story is that Windows looks
-            // to not support `extern` references to thread locals across DLL
-            // boundaries. This appears to at least not be supported in the ABI
-            // that LLVM implements.
+            // everywhere other than Windows?", and "why must it not be inlined
+            // on Windows?" and these are very reasonable questions to ask.
+            //
+            // The short story is that Windows doesn't support referencing
+            // `#[thread_local]` across DLL boundaries. The slightly longer
+            // story is that each module (dll or exe) has its own separate set
+            // of static thread locals, so if you try and reference a
+            // `#[thread_local]` that comes from `crate1.dll` from within one of
+            // `crate2.dll`'s functions, then it might give you a completely
+            // different thread local than what you asked for (or it might just
+            // crash).
             //
             // Because of this we never inline on Windows, but we do inline on
             // other platforms (where external references to thread locals
@@ -314,8 +320,9 @@ macro_rules! __thread_local_inner {
             // Cargo question kinda). This means that, unfortunately, Windows
             // gets the pessimistic path for now where it's never inlined.
             //
-            // The issue of "should enable on Windows sometimes" is #84933
-            #[cfg_attr(not(windows), inline)]
+            // The issue of "should improve things on Windows" is #84933
+            #[cfg_attr(not(all(windows, target_thread_local)), inline)]
+            #[cfg_attr(all(windows, target_thread_local), inline(never))]
             unsafe fn __getit(
                 init: $crate::option::Option<&mut $crate::option::Option<$t>>,
             ) -> $crate::option::Option<&'static $t> {

src/doc/rustc/src/platform-support.md

@@ -283,6 +283,7 @@ target | std | host | notes
 `powerpc64-wrs-vxworks` | ? |  |
 `powerpc64le-unknown-linux-musl` | ? |  |
 [`powerpc64-unknown-openbsd`](platform-support/openbsd.md) | ✓ | ✓ | OpenBSD/powerpc64
+`powerpc64-ibm-aix` | ? |  | 64-bit AIX (7.2 and newer)
 `riscv32gc-unknown-linux-gnu` |   |   | RISC-V Linux (kernel 5.4, glibc 2.33)
 `riscv32gc-unknown-linux-musl` |   |   | RISC-V Linux (kernel 5.4, musl + RISCV32 support patches)
 `riscv32im-unknown-none-elf` | * |  | Bare RISC-V (RV32IM ISA)

src/librustdoc/html/static/css/rustdoc.css

@@ -932,7 +932,6 @@ so that we can apply CSS-filters to change the arrow color in themes */
 	right: var(--popover-arrow-offset);
 	border: solid var(--border-color);
 	border-width: 1px 1px 0 0;
-	display: inline-block;
 	padding: 4px;
 	transform: rotate(-45deg);
 	top: -5px;
@@ -1200,7 +1199,6 @@ pre.rust .doccomment {
 }
 
 a.test-arrow {
-	display: inline-block;
 	visibility: hidden;
 	position: absolute;
 	padding: 5px 10px 5px 10px;

src/test/ui/check-cfg/well-known-values.stderr

@@ -6,7 +6,7 @@ LL | #[cfg(target_os = "linuz")]
    |                   |
    |                   help: did you mean: `"linux"`
    |
-   = note: expected values for `target_os` are: android, cuda, dragonfly, emscripten, espidf, freebsd, fuchsia, haiku, hermit, horizon, illumos, ios, l4re, linux, macos, netbsd, none, nto, openbsd, psp, redox, solaris, solid_asp3, tvos, uefi, unknown, vxworks, wasi, watchos, windows, xous
+   = note: expected values for `target_os` are: aix, android, cuda, dragonfly, emscripten, espidf, freebsd, fuchsia, haiku, hermit, horizon, illumos, ios, l4re, linux, macos, netbsd, none, nto, openbsd, psp, redox, solaris, solid_asp3, tvos, uefi, unknown, vxworks, wasi, watchos, windows, xous
    = note: `#[warn(unexpected_cfgs)]` on by default
 
 warning: unexpected `cfg` condition value

src/test/ui/const-generics/projection-as-arg-const.rs

@@ -0,0 +1,20 @@
+// This is currently not possible to use projections as const generics.
+// More information about this available here:
+// https://github.com/rust-lang/rust/pull/104443#discussion_r1029375633
+
+pub trait Identity {
+    type Identity;
+}
+
+impl<T> Identity for T {
+    type Identity = Self;
+}
+
+pub fn foo<const X: <i32 as Identity>::Identity>() {
+//~^ ERROR
+    assert!(X == 12);
+}
+
+fn main() {
+    foo::<12>();
+}

src/test/ui/const-generics/projection-as-arg-const.stderr

@@ -0,0 +1,11 @@
+error: `<i32 as Identity>::Identity` is forbidden as the type of a const generic parameter
+  --> $DIR/projection-as-arg-const.rs:13:21
+   |
+LL | pub fn foo<const X: <i32 as Identity>::Identity>() {
+   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: the only supported types are integers, `bool` and `char`
+   = help: more complex types are supported with `#![feature(adt_const_params)]`
+
+error: aborting due to previous error
+

src/test/ui/mismatched_types/overloaded-calls-bad.rs

@@ -20,14 +20,23 @@ impl FnOnce<(isize,)> for S {
     }
 }
 
+struct F;
+
+impl FnOnce<(i32,)> for F {
+    type Output = ();
+
+    extern "rust-call" fn call_once(self, args: (i32,)) -> Self::Output {}
+}
+
 fn main() {
-    let mut s = S {
-        x: 3,
-        y: 3,
-    };
-    let ans = s("what");    //~ ERROR mismatched types
+    let mut s = S { x: 3, y: 3 };
+    let ans = s("what");
+    //~^ ERROR mismatched types
     let ans = s();
     //~^ ERROR this function takes 1 argument but 0 arguments were supplied
     let ans = s("burma", "shave");
     //~^ ERROR this function takes 1 argument but 2 arguments were supplied
+
+    F("");
+    //~^ ERROR mismatched types
 }