Auto merge of #99592 - Dylan-DPC:rollup-xlw4wax, r=Dylan-DPC

Rollup of 6 pull requests

Successful merges:

 - #98174 (Rename `<*{mut,const} T>::as_{const,mut}` to `cast_`)
 - #98868 (Fix unreachable coverage generation for inlined functions)
 - #99393 (feat: omit suffixes in const generics (e.g. `1_i32`))
 - #99423 (Group CSS font rule)
 - #99539 (Improve suggestions for returning binding)
 - #99579 (Add same warning to Result::expect as Result::unwrap)

Failed merges:

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

compiler/rustc_codegen_ssa/src/mir/coverageinfo.rs

@@ -9,11 +9,8 @@ use super::FunctionCx;
 impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
     pub fn codegen_coverage(&self, bx: &mut Bx, coverage: Coverage, scope: SourceScope) {
         // Determine the instance that coverage data was originally generated for.
-        let scope_data = &self.mir.source_scopes[scope];
-        let instance = if let Some((inlined_instance, _)) = scope_data.inlined {
-            self.monomorphize(inlined_instance)
-        } else if let Some(inlined_scope) = scope_data.inlined_parent_scope {
-            self.monomorphize(self.mir.source_scopes[inlined_scope].inlined.unwrap().0)
+        let instance = if let Some(inlined) = scope.inlined_instance(&self.mir.source_scopes) {
+            self.monomorphize(inlined)
         } else {
             self.instance
         };

compiler/rustc_hir/src/hir.rs

@@ -954,6 +954,16 @@ pub struct Block<'hir> {
     pub targeted_by_break: bool,
 }
 
+impl<'hir> Block<'hir> {
+    pub fn innermost_block(&self) -> &Block<'hir> {
+        let mut block = self;
+        while let Some(Expr { kind: ExprKind::Block(inner_block, _), .. }) = block.expr {
+            block = inner_block;
+        }
+        block
+    }
+}
+
 #[derive(Debug, HashStable_Generic)]
 pub struct Pat<'hir> {
     #[stable_hasher(ignore)]

compiler/rustc_middle/src/mir/mod.rs

@@ -1662,6 +1662,22 @@ impl SourceScope {
             ClearCrossCrate::Clear => None,
         }
     }
+
+    /// The instance this source scope was inlined from, if any.
+    #[inline]
+    pub fn inlined_instance<'tcx>(
+        self,
+        source_scopes: &IndexVec<SourceScope, SourceScopeData<'tcx>>,
+    ) -> Option<ty::Instance<'tcx>> {
+        let scope_data = &source_scopes[self];
+        if let Some((inlined_instance, _)) = scope_data.inlined {
+            Some(inlined_instance)
+        } else if let Some(inlined_scope) = scope_data.inlined_parent_scope {
+            Some(source_scopes[inlined_scope].inlined.unwrap().0)
+        } else {
+            None
+        }
+    }
 }
 
 #[derive(Clone, Debug, TyEncodable, TyDecodable, HashStable, TypeFoldable, TypeVisitable)]

compiler/rustc_middle/src/traits/mod.rs

@@ -351,7 +351,7 @@ pub enum ObligationCauseCode<'tcx> {
     ConstPatternStructural,
 
     /// Computing common supertype in an if expression
-    IfExpression(Box<IfExpressionCause>),
+    IfExpression(Box<IfExpressionCause<'tcx>>),
 
     /// Computing common supertype of an if expression with no else counter-part
     IfExpressionWithNoElse,
@@ -488,22 +488,27 @@ impl<'tcx> ty::Lift<'tcx> for StatementAsExpression {
 
 #[derive(Clone, Debug, PartialEq, Eq, Hash, Lift)]
 pub struct MatchExpressionArmCause<'tcx> {
+    pub arm_block_id: Option<hir::HirId>,
+    pub arm_ty: Ty<'tcx>,
     pub arm_span: Span,
+    pub prior_arm_block_id: Option<hir::HirId>,
+    pub prior_arm_ty: Ty<'tcx>,
+    pub prior_arm_span: Span,
     pub scrut_span: Span,
-    pub semi_span: Option<(Span, StatementAsExpression)>,
     pub source: hir::MatchSource,
     pub prior_arms: Vec<Span>,
-    pub last_ty: Ty<'tcx>,
     pub scrut_hir_id: hir::HirId,
     pub opt_suggest_box_span: Option<Span>,
 }
 
-#[derive(Clone, Debug, PartialEq, Eq, Hash)]
-pub struct IfExpressionCause {
-    pub then: Span,
-    pub else_sp: Span,
-    pub outer: Option<Span>,
-    pub semicolon: Option<(Span, StatementAsExpression)>,
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
+#[derive(Lift, TypeFoldable, TypeVisitable)]
+pub struct IfExpressionCause<'tcx> {
+    pub then_id: hir::HirId,
+    pub else_id: hir::HirId,
+    pub then_ty: Ty<'tcx>,
+    pub else_ty: Ty<'tcx>,
+    pub outer_span: Option<Span>,
     pub opt_suggest_box_span: Option<Span>,
 }
 

compiler/rustc_middle/src/traits/structural_impls.rs

@@ -130,7 +130,6 @@ impl<N: fmt::Debug> fmt::Debug for traits::ImplSourceConstDestructData<N> {
 // Lift implementations
 
 TrivialTypeTraversalAndLiftImpls! {
-    super::IfExpressionCause,
     super::ImplSourceDiscriminantKindData,
     super::ImplSourcePointeeData,
 }

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

@@ -1729,7 +1729,7 @@ impl<'tcx> Printer<'tcx> for FmtPrinter<'_, 'tcx> {
     }
 
     fn print_const(self, ct: ty::Const<'tcx>) -> Result<Self::Const, Self::Error> {
-        self.pretty_print_const(ct, true)
+        self.pretty_print_const(ct, false)
     }
 
     fn path_crate(mut self, cnum: CrateNum) -> Result<Self::Path, Self::Error> {

compiler/rustc_mir_transform/src/simplify.rs

@@ -28,6 +28,7 @@
 //! return.
 
 use crate::MirPass;
+use rustc_data_structures::fx::FxHashSet;
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_middle::mir::coverage::*;
 use rustc_middle::mir::visit::{MutVisitor, MutatingUseContext, PlaceContext, Visitor};
@@ -267,7 +268,8 @@ pub fn remove_dead_blocks<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
         return;
     }
 
-    let basic_blocks = body.basic_blocks_mut();
+    let basic_blocks = body.basic_blocks.as_mut();
+    let source_scopes = &body.source_scopes;
     let mut replacements: Vec<_> = (0..num_blocks).map(BasicBlock::new).collect();
     let mut used_blocks = 0;
     for alive_index in reachable.iter() {
@@ -282,7 +284,7 @@ pub fn remove_dead_blocks<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
     }
 
     if tcx.sess.instrument_coverage() {
-        save_unreachable_coverage(basic_blocks, used_blocks);
+        save_unreachable_coverage(basic_blocks, source_scopes, used_blocks);
     }
 
     basic_blocks.raw.truncate(used_blocks);
@@ -311,56 +313,62 @@ pub fn remove_dead_blocks<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
 /// `Unreachable` coverage statements. These are non-executable statements whose
 /// code regions are still recorded in the coverage map, representing regions
 /// with `0` executions.
+///
+/// If there are no live `Counter` `Coverage` statements remaining, we remove
+/// dead `Coverage` statements along with the dead blocks. Since at least one
+/// counter per function is required by LLVM (and necessary, to add the
+/// `function_hash` to the counter's call to the LLVM intrinsic
+/// `instrprof.increment()`).
+///
+/// The `generator::StateTransform` MIR pass and MIR inlining can create
+/// atypical conditions, where all live `Counter`s are dropped from the MIR.
+///
+/// With MIR inlining we can have coverage counters belonging to different
+/// instances in a single body, so the strategy described above is applied to
+/// coverage counters from each instance individually.
 fn save_unreachable_coverage(
     basic_blocks: &mut IndexVec<BasicBlock, BasicBlockData<'_>>,
+    source_scopes: &IndexVec<SourceScope, SourceScopeData<'_>>,
     first_dead_block: usize,
 ) {
-    let has_live_counters = basic_blocks.raw[0..first_dead_block].iter().any(|live_block| {
-        live_block.statements.iter().any(|statement| {
-            if let StatementKind::Coverage(coverage) = &statement.kind {
-                matches!(coverage.kind, CoverageKind::Counter { .. })
-            } else {
-                false
-            }
-        })
-    });
-    if !has_live_counters {
-        // If there are no live `Counter` `Coverage` statements anymore, don't
-        // move dead coverage to the `START_BLOCK`. Just allow the dead
-        // `Coverage` statements to be dropped with the dead blocks.
-        //
-        // The `generator::StateTransform` MIR pass can create atypical
-        // conditions, where all live `Counter`s are dropped from the MIR.
-        //
-        // At least one Counter per function is required by LLVM (and necessary,
-        // to add the `function_hash` to the counter's call to the LLVM
-        // intrinsic `instrprof.increment()`).
+    // Identify instances that still have some live coverage counters left.
+    let mut live = FxHashSet::default();
+    for basic_block in &basic_blocks.raw[0..first_dead_block] {
+        for statement in &basic_block.statements {
+            let StatementKind::Coverage(coverage) = &statement.kind else { continue };
+            let CoverageKind::Counter { .. } = coverage.kind else { continue };
+            let instance = statement.source_info.scope.inlined_instance(source_scopes);
+            live.insert(instance);
+        }
+    }
+
+    if live.is_empty() {
         return;
     }
 
-    // Retain coverage info for dead blocks, so coverage reports will still
-    // report `0` executions for the uncovered code regions.
-    let mut dropped_coverage = Vec::new();
-    for dead_block in basic_blocks.raw[first_dead_block..].iter() {
-        for statement in dead_block.statements.iter() {
-            if let StatementKind::Coverage(coverage) = &statement.kind {
-                if let Some(code_region) = &coverage.code_region {
-                    dropped_coverage.push((statement.source_info, code_region.clone()));
-                }
+    // Retain coverage for instances that still have some live counters left.
+    let mut retained_coverage = Vec::new();
+    for dead_block in &basic_blocks.raw[first_dead_block..] {
+        for statement in &dead_block.statements {
+            let StatementKind::Coverage(coverage) = &statement.kind else { continue };
+            let Some(code_region) = &coverage.code_region else { continue };
+            let instance = statement.source_info.scope.inlined_instance(source_scopes);
+            if live.contains(&instance) {
+                retained_coverage.push((statement.source_info, code_region.clone()));
             }
         }
     }
 
     let start_block = &mut basic_blocks[START_BLOCK];
-    for (source_info, code_region) in dropped_coverage {
-        start_block.statements.push(Statement {
+    start_block.statements.extend(retained_coverage.into_iter().map(
+        |(source_info, code_region)| Statement {
             source_info,
             kind: StatementKind::Coverage(Box::new(Coverage {
                 kind: CoverageKind::Unreachable,
                 code_region: Some(code_region),
             })),
-        })
-    }
+        },
+    ));
 }
 
 pub struct SimplifyLocals;

compiler/rustc_monomorphize/src/partitioning/mod.rs

@@ -98,6 +98,7 @@ mod merging;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_data_structures::sync;
 use rustc_hir::def_id::DefIdSet;
+use rustc_middle::mir;
 use rustc_middle::mir::mono::MonoItem;
 use rustc_middle::mir::mono::{CodegenUnit, Linkage};
 use rustc_middle::ty::print::with_no_trimmed_paths;
@@ -479,9 +480,14 @@ fn codegened_and_inlined_items<'tcx>(tcx: TyCtxt<'tcx>, (): ()) -> &'tcx DefIdSe
                 if !visited.insert(did) {
                     continue;
                 }
-                for scope in &tcx.instance_mir(instance.def).source_scopes {
-                    if let Some((ref inlined, _)) = scope.inlined {
-                        result.insert(inlined.def_id());
+                let body = tcx.instance_mir(instance.def);
+                for block in body.basic_blocks() {
+                    for statement in &block.statements {
+                        let mir::StatementKind::Coverage(_) = statement.kind else { continue };
+                        let scope = statement.source_info.scope;
+                        if let Some(inlined) = scope.inlined_instance(&body.source_scopes) {
+                            result.insert(inlined.def_id());
+                        }
                     }
                 }
             }

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

@@ -22,7 +22,6 @@ use rustc_hir::intravisit::Visitor;
 use rustc_hir::GenericParam;
 use rustc_hir::Item;
 use rustc_hir::Node;
-use rustc_infer::infer::error_reporting::same_type_modulo_infer;
 use rustc_infer::traits::TraitEngine;
 use rustc_middle::traits::select::OverflowError;
 use rustc_middle::ty::abstract_const::NotConstEvaluatable;
@@ -640,7 +639,7 @@ impl<'a, 'tcx> InferCtxtExt<'tcx> for InferCtxt<'a, 'tcx> {
                                             if expected.len() == 1 { "" } else { "s" },
                                         )
                                     );
-                                } else if !same_type_modulo_infer(given_ty, expected_ty) {
+                                } else if !self.same_type_modulo_infer(given_ty, expected_ty) {
                                     // Print type mismatch
                                     let (expected_args, given_args) =
                                         self.cmp(given_ty, expected_ty);