Auto merge of rust-lang#119680 - compiler-errors:rollup-1kvfehl, r=co…

…mpiler-errors

Rollup of 6 pull requests

Successful merges:

 - rust-lang#119252 (rustc_mir_transform: Enforce `rustc::potential_query_instability` lint)
 - rust-lang#119548 (Use the current target instead of iterating over all targets)
 - rust-lang#119656 (document rounding behavior of rint/nearbyint for ties)
 - rust-lang#119657 (Fix typo in docs for slice::split_once, slice::rsplit_once)
 - rust-lang#119666 (Populate `yield` and `resume` types in MIR body while body is being initialized)
 - rust-lang#119679 (Ask for rustc version in diagnostic reports, remind users to update their toolchain)

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

.github/ISSUE_TEMPLATE/diagnostics.yaml

@@ -52,10 +52,23 @@ body:
       render: Rust
     validations:
       required: false
-  - type: markdown
+  - type: textarea
+    id: version
     attributes:
-      value: |
-        If you're using the stable version of the compiler, you should also check if the bug also exists in the beta or nightly versions. The output might also be different depending on the Edition.
+      label: Rust Version
+      description: Please provide the `rustc` version, `rustc --version --verbose`. Make sure that you're using the latest version of the compiler, and not an outdated stable or nightly release!
+      placeholder: |
+        $ rustc --version --verbose
+        rustc 1.XX.Y (SHORTHASH DATE)
+        binary: rustc
+        commit-hash: LONGHASHVALUE
+        commit-date: DATE
+        host: PLATFORMTRIPLE
+        release: 1.XX.Y
+        LLVM version: XX.YY.ZZ
+      render: Shell
+    validations:
+      required: true
   - type: textarea
     id: extra
     attributes:

.github/ISSUE_TEMPLATE/ice.yaml

@@ -40,7 +40,7 @@ body:
     id: version
     attributes:
       label: Rust Version
-      description: Please provide the `rustc` version, `rustc --version --verbose`
+      description: Please provide the `rustc` version, `rustc --version --verbose`. Make sure that you're using the latest version of the compiler, and not an outdated stable or nightly release!
       placeholder: |
         $ rustc --version --verbose
         rustc 1.XX.Y (SHORTHASH DATE)

compiler/rustc_const_eval/src/transform/promote_consts.rs

@@ -969,7 +969,7 @@ pub fn promote_candidates<'tcx>(
             0,
             vec![],
             body.span,
-            body.coroutine_kind(),
+            None,
             body.tainted_by_errors,
         );
         promoted.phase = MirPhase::Analysis(AnalysisPhase::Initial);

compiler/rustc_middle/src/mir/mod.rs

@@ -263,6 +263,23 @@ pub struct CoroutineInfo<'tcx> {
     pub coroutine_kind: CoroutineKind,
 }
 
+impl<'tcx> CoroutineInfo<'tcx> {
+    // Sets up `CoroutineInfo` for a pre-coroutine-transform MIR body.
+    pub fn initial(
+        coroutine_kind: CoroutineKind,
+        yield_ty: Ty<'tcx>,
+        resume_ty: Ty<'tcx>,
+    ) -> CoroutineInfo<'tcx> {
+        CoroutineInfo {
+            coroutine_kind,
+            yield_ty: Some(yield_ty),
+            resume_ty: Some(resume_ty),
+            coroutine_drop: None,
+            coroutine_layout: None,
+        }
+    }
+}
+
 /// The lowered representation of a single function.
 #[derive(Clone, TyEncodable, TyDecodable, Debug, HashStable, TypeFoldable, TypeVisitable)]
 pub struct Body<'tcx> {
@@ -367,7 +384,7 @@ impl<'tcx> Body<'tcx> {
         arg_count: usize,
         var_debug_info: Vec<VarDebugInfo<'tcx>>,
         span: Span,
-        coroutine_kind: Option<CoroutineKind>,
+        coroutine: Option<Box<CoroutineInfo<'tcx>>>,
         tainted_by_errors: Option<ErrorGuaranteed>,
     ) -> Self {
         // We need `arg_count` locals, and one for the return place.
@@ -384,15 +401,7 @@ impl<'tcx> Body<'tcx> {
             source,
             basic_blocks: BasicBlocks::new(basic_blocks),
             source_scopes,
-            coroutine: coroutine_kind.map(|coroutine_kind| {
-                Box::new(CoroutineInfo {
-                    yield_ty: None,
-                    resume_ty: None,
-                    coroutine_drop: None,
-                    coroutine_layout: None,
-                    coroutine_kind,
-                })
-            }),
+            coroutine,
             local_decls,
             user_type_annotations,
             arg_count,

compiler/rustc_middle/src/thir.rs

@@ -86,8 +86,6 @@ macro_rules! thir_with_elements {
     }
 }
 
-pub const UPVAR_ENV_PARAM: ParamId = ParamId::from_u32(0);
-
 thir_with_elements! {
     body_type: BodyTy<'tcx>,
 

compiler/rustc_mir_build/src/build/mod.rs

@@ -9,7 +9,7 @@ use rustc_errors::ErrorGuaranteed;
 use rustc_hir as hir;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
-use rustc_hir::{CoroutineKind, Node};
+use rustc_hir::Node;
 use rustc_index::bit_set::GrowableBitSet;
 use rustc_index::{Idx, IndexSlice, IndexVec};
 use rustc_infer::infer::{InferCtxt, TyCtxtInferExt};
@@ -177,7 +177,7 @@ struct Builder<'a, 'tcx> {
     check_overflow: bool,
     fn_span: Span,
     arg_count: usize,
-    coroutine_kind: Option<CoroutineKind>,
+    coroutine: Option<Box<CoroutineInfo<'tcx>>>,
 
     /// The current set of scopes, updated as we traverse;
     /// see the `scope` module for more details.
@@ -458,7 +458,6 @@ fn construct_fn<'tcx>(
 ) -> Body<'tcx> {
     let span = tcx.def_span(fn_def);
     let fn_id = tcx.local_def_id_to_hir_id(fn_def);
-    let coroutine_kind = tcx.coroutine_kind(fn_def);
 
     // The representation of thir for `-Zunpretty=thir-tree` relies on
     // the entry expression being the last element of `thir.exprs`.
@@ -488,17 +487,15 @@ fn construct_fn<'tcx>(
 
     let arguments = &thir.params;
 
-    let (resume_ty, yield_ty, return_ty) = if coroutine_kind.is_some() {
-        let coroutine_ty = arguments[thir::UPVAR_ENV_PARAM].ty;
-        let coroutine_sig = match coroutine_ty.kind() {
-            ty::Coroutine(_, gen_args, ..) => gen_args.as_coroutine().sig(),
-            _ => {
-                span_bug!(span, "coroutine w/o coroutine type: {:?}", coroutine_ty)
-            }
-        };
-        (Some(coroutine_sig.resume_ty), Some(coroutine_sig.yield_ty), coroutine_sig.return_ty)
-    } else {
-        (None, None, fn_sig.output())
+    let return_ty = fn_sig.output();
+    let coroutine = match tcx.type_of(fn_def).instantiate_identity().kind() {
+        ty::Coroutine(_, args) => Some(Box::new(CoroutineInfo::initial(
+            tcx.coroutine_kind(fn_def).unwrap(),
+            args.as_coroutine().yield_ty(),
+            args.as_coroutine().resume_ty(),
+        ))),
+        ty::Closure(..) | ty::FnDef(..) => None,
+        ty => span_bug!(span_with_body, "unexpected type of body: {ty:?}"),
     };
 
     if let Some(custom_mir_attr) =
@@ -529,7 +526,7 @@ fn construct_fn<'tcx>(
         safety,
         return_ty,
         return_ty_span,
-        coroutine_kind,
+        coroutine,
     );
 
     let call_site_scope =
@@ -563,11 +560,6 @@ fn construct_fn<'tcx>(
         None
     };
 
-    if coroutine_kind.is_some() {
-        body.coroutine.as_mut().unwrap().yield_ty = yield_ty;
-        body.coroutine.as_mut().unwrap().resume_ty = resume_ty;
-    }
-
     body
 }
 
@@ -632,47 +624,62 @@ fn construct_const<'a, 'tcx>(
 fn construct_error(tcx: TyCtxt<'_>, def_id: LocalDefId, guar: ErrorGuaranteed) -> Body<'_> {
     let span = tcx.def_span(def_id);
     let hir_id = tcx.local_def_id_to_hir_id(def_id);
-    let coroutine_kind = tcx.coroutine_kind(def_id);
 
-    let (inputs, output, resume_ty, yield_ty) = match tcx.def_kind(def_id) {
+    let (inputs, output, coroutine) = match tcx.def_kind(def_id) {
         DefKind::Const
         | DefKind::AssocConst
         | DefKind::AnonConst
         | DefKind::InlineConst
-        | DefKind::Static(_) => (vec![], tcx.type_of(def_id).instantiate_identity(), None, None),
+        | DefKind::Static(_) => (vec![], tcx.type_of(def_id).instantiate_identity(), None),
         DefKind::Ctor(..) | DefKind::Fn | DefKind::AssocFn => {
             let sig = tcx.liberate_late_bound_regions(
                 def_id.to_def_id(),
                 tcx.fn_sig(def_id).instantiate_identity(),
             );
-            (sig.inputs().to_vec(), sig.output(), None, None)
-        }
-        DefKind::Closure if coroutine_kind.is_some() => {
-            let coroutine_ty = tcx.type_of(def_id).instantiate_identity();
-            let ty::Coroutine(_, args) = coroutine_ty.kind() else {
-                bug!("expected type of coroutine-like closure to be a coroutine")
-            };
-            let args = args.as_coroutine();
-            let resume_ty = args.resume_ty();
-            let yield_ty = args.yield_ty();
-            let return_ty = args.return_ty();
-            (vec![coroutine_ty, args.resume_ty()], return_ty, Some(resume_ty), Some(yield_ty))
+            (sig.inputs().to_vec(), sig.output(), None)
         }
         DefKind::Closure => {
             let closure_ty = tcx.type_of(def_id).instantiate_identity();
-            let ty::Closure(_, args) = closure_ty.kind() else {
-                bug!("expected type of closure to be a closure")
-            };
-            let args = args.as_closure();
-            let sig = tcx.liberate_late_bound_regions(def_id.to_def_id(), args.sig());
-            let self_ty = match args.kind() {
-                ty::ClosureKind::Fn => Ty::new_imm_ref(tcx, tcx.lifetimes.re_erased, closure_ty),
-                ty::ClosureKind::FnMut => Ty::new_mut_ref(tcx, tcx.lifetimes.re_erased, closure_ty),
-                ty::ClosureKind::FnOnce => closure_ty,
-            };
-            ([self_ty].into_iter().chain(sig.inputs().to_vec()).collect(), sig.output(), None, None)
+            match closure_ty.kind() {
+                ty::Closure(_, args) => {
+                    let args = args.as_closure();
+                    let sig = tcx.liberate_late_bound_regions(def_id.to_def_id(), args.sig());
+                    let self_ty = match args.kind() {
+                        ty::ClosureKind::Fn => {
+                            Ty::new_imm_ref(tcx, tcx.lifetimes.re_erased, closure_ty)
+                        }
+                        ty::ClosureKind::FnMut => {
+                            Ty::new_mut_ref(tcx, tcx.lifetimes.re_erased, closure_ty)
+                        }
+                        ty::ClosureKind::FnOnce => closure_ty,
+                    };
+                    (
+                        [self_ty].into_iter().chain(sig.inputs().to_vec()).collect(),
+                        sig.output(),
+                        None,
+                    )
+                }
+                ty::Coroutine(_, args) => {
+                    let args = args.as_coroutine();
+                    let resume_ty = args.resume_ty();
+                    let yield_ty = args.yield_ty();
+                    let return_ty = args.return_ty();
+                    (
+                        vec![closure_ty, args.resume_ty()],
+                        return_ty,
+                        Some(Box::new(CoroutineInfo::initial(
+                            tcx.coroutine_kind(def_id).unwrap(),
+                            yield_ty,
+                            resume_ty,
+                        ))),
+                    )
+                }
+                _ => {
+                    span_bug!(span, "expected type of closure body to be a closure or coroutine");
+                }
+            }
         }
-        dk => bug!("{:?} is not a body: {:?}", def_id, dk),
+        dk => span_bug!(span, "{:?} is not a body: {:?}", def_id, dk),
     };
 
     let source_info = SourceInfo { span, scope: OUTERMOST_SOURCE_SCOPE };
@@ -696,7 +703,7 @@ fn construct_error(tcx: TyCtxt<'_>, def_id: LocalDefId, guar: ErrorGuaranteed) -
 
     cfg.terminate(START_BLOCK, source_info, TerminatorKind::Unreachable);
 
-    let mut body = Body::new(
+    Body::new(
         MirSource::item(def_id.to_def_id()),
         cfg.basic_blocks,
         source_scopes,
@@ -705,16 +712,9 @@ fn construct_error(tcx: TyCtxt<'_>, def_id: LocalDefId, guar: ErrorGuaranteed) -
         inputs.len(),
         vec![],
         span,
-        coroutine_kind,
+        coroutine,
         Some(guar),
-    );
-
-    body.coroutine.as_mut().map(|gen| {
-        gen.yield_ty = yield_ty;
-        gen.resume_ty = resume_ty;
-    });
-
-    body
+    )
 }
 
 impl<'a, 'tcx> Builder<'a, 'tcx> {
@@ -728,7 +728,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         safety: Safety,
         return_ty: Ty<'tcx>,
         return_span: Span,
-        coroutine_kind: Option<CoroutineKind>,
+        coroutine: Option<Box<CoroutineInfo<'tcx>>>,
     ) -> Builder<'a, 'tcx> {
         let tcx = infcx.tcx;
         let attrs = tcx.hir().attrs(hir_id);
@@ -759,7 +759,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             cfg: CFG { basic_blocks: IndexVec::new() },
             fn_span: span,
             arg_count,
-            coroutine_kind,
+            coroutine,
             scopes: scope::Scopes::new(),
             block_context: BlockContext::new(),
             source_scopes: IndexVec::new(),
@@ -803,7 +803,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             self.arg_count,
             self.var_debug_info,
             self.fn_span,
-            self.coroutine_kind,
+            self.coroutine,
             None,
         )
     }

compiler/rustc_mir_build/src/build/scope.rs

@@ -706,7 +706,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         // If we are emitting a `drop` statement, we need to have the cached
         // diverge cleanup pads ready in case that drop panics.
         let needs_cleanup = self.scopes.scopes.last().is_some_and(|scope| scope.needs_cleanup());
-        let is_coroutine = self.coroutine_kind.is_some();
+        let is_coroutine = self.coroutine.is_some();
         let unwind_to = if needs_cleanup { self.diverge_cleanup() } else { DropIdx::MAX };
 
         let scope = self.scopes.scopes.last().expect("leave_top_scope called with no scopes");
@@ -960,7 +960,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
         // path, we only need to invalidate the cache for drops that happen on
         // the unwind or coroutine drop paths. This means that for
         // non-coroutines we don't need to invalidate caches for `DropKind::Storage`.
-        let invalidate_caches = needs_drop || self.coroutine_kind.is_some();
+        let invalidate_caches = needs_drop || self.coroutine.is_some();
         for scope in self.scopes.scopes.iter_mut().rev() {
             if invalidate_caches {
                 scope.invalidate_cache();
@@ -1073,7 +1073,7 @@ impl<'a, 'tcx> Builder<'a, 'tcx> {
             return cached_drop;
         }
 
-        let is_coroutine = self.coroutine_kind.is_some();
+        let is_coroutine = self.coroutine.is_some();
         for scope in &mut self.scopes.scopes[uncached_scope..=target] {
             for drop in &scope.drops {
                 if is_coroutine || drop.kind == DropKind::Value {
@@ -1318,7 +1318,7 @@ impl<'a, 'tcx: 'a> Builder<'a, 'tcx> {
         blocks[ROOT_NODE] = continue_block;
 
         drops.build_mir::<ExitScopes>(&mut self.cfg, &mut blocks);
-        let is_coroutine = self.coroutine_kind.is_some();
+        let is_coroutine = self.coroutine.is_some();
 
         // Link the exit drop tree to unwind drop tree.
         if drops.drops.iter().any(|(drop, _)| drop.kind == DropKind::Value) {
@@ -1355,7 +1355,7 @@ impl<'a, 'tcx: 'a> Builder<'a, 'tcx> {
 
     /// Build the unwind and coroutine drop trees.
     pub(crate) fn build_drop_trees(&mut self) {
-        if self.coroutine_kind.is_some() {
+        if self.coroutine.is_some() {
             self.build_coroutine_drop_trees();
         } else {
             Self::build_unwind_tree(

compiler/rustc_mir_transform/src/const_prop_lint.rs

@@ -670,6 +670,8 @@ impl<'tcx> Visitor<'tcx> for ConstPropagator<'_, 'tcx> {
         // This loop can get very hot for some bodies: it check each local in each bb.
         // To avoid this quadratic behaviour, we only clear the locals that were modified inside
         // the current block.
+        // The order in which we remove consts does not matter.
+        #[allow(rustc::potential_query_instability)]
         for local in written_only_inside_own_block_locals.drain() {
             debug_assert_eq!(
                 self.ecx.machine.can_const_prop[local],

compiler/rustc_mir_transform/src/lib.rs

@@ -1,4 +1,3 @@
-#![allow(rustc::potential_query_instability)]
 #![deny(rustc::untranslatable_diagnostic)]
 #![deny(rustc::diagnostic_outside_of_impl)]
 #![feature(box_patterns)]

compiler/rustc_mir_transform/src/unreachable_prop.rs

@@ -54,6 +54,8 @@ impl MirPass<'_> for UnreachablePropagation {
         patch.apply(body);
 
         // We do want do keep some unreachable blocks, but make them empty.
+        // The order in which we clear bb statements does not matter.
+        #[allow(rustc::potential_query_instability)]
         for bb in unreachable_blocks {
             body.basic_blocks_mut()[bb].statements.clear();
         }