Auto merge of rust-lang#120025 - matthiaskrgr:rollup-e9ai06k, r=matth…

…iaskrgr

Rollup of 8 pull requests

Successful merges:

 - rust-lang#118361 (stabilise bound_map)
 - rust-lang#119816 (Define hidden types in confirmation)
 - rust-lang#119900 (Inline `check_closure`, simplify `deduce_sig_from_projection`)
 - rust-lang#119969 (Simplify `closure_env_ty` and `closure_env_param`)
 - rust-lang#119990 (Add private `NonZero<T>` type alias.)
 - rust-lang#119998 (Update books)
 - rust-lang#120002 (Lint `overlapping_ranges_endpoints` directly instead of collecting into a Vec)
 - rust-lang#120018 (Don't allow `.html` files in `tests/mir-opt/`)

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

compiler/rustc_borrowck/src/universal_regions.rs

@@ -668,7 +668,11 @@ impl<'cx, 'tcx> UniversalRegionsBuilder<'cx, 'tcx> {
                     kind: ty::BrEnv,
                 };
                 let env_region = ty::Region::new_bound(tcx, ty::INNERMOST, br);
-                let closure_ty = tcx.closure_env_ty(def_id, args, env_region).unwrap();
+                let closure_ty = tcx.closure_env_ty(
+                    Ty::new_closure(tcx, def_id, args),
+                    args.as_closure().kind(),
+                    env_region,
+                );
 
                 // The "inputs" of the closure in the
                 // signature appear as a tuple. The MIR side

compiler/rustc_hir_typeck/src/closure.rs

@@ -14,7 +14,7 @@ use rustc_middle::ty::visit::{TypeVisitable, TypeVisitableExt};
 use rustc_middle::ty::GenericArgs;
 use rustc_middle::ty::{self, Ty, TyCtxt, TypeSuperVisitable, TypeVisitor};
 use rustc_span::def_id::LocalDefId;
-use rustc_span::{sym, Span};
+use rustc_span::Span;
 use rustc_target::spec::abi::Abi;
 use rustc_trait_selection::traits;
 use rustc_trait_selection::traits::error_reporting::ArgKind;
@@ -49,7 +49,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         expr_span: Span,
         expected: Expectation<'tcx>,
     ) -> Ty<'tcx> {
-        trace!("decl = {:#?}", closure.fn_decl);
+        let tcx = self.tcx;
+        let body = tcx.hir().body(closure.body);
+        let expr_def_id = closure.def_id;
 
         // It's always helpful for inference if we know the kind of
         // closure sooner rather than later, so first examine the expected
@@ -61,24 +63,6 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             None => (None, None),
         };
 
-        self.check_closure(closure, expr_span, expected_kind, expected_sig)
-    }
-
-    #[instrument(skip(self, closure), level = "debug", ret)]
-    fn check_closure(
-        &self,
-        closure: &hir::Closure<'tcx>,
-        expr_span: Span,
-        opt_kind: Option<ty::ClosureKind>,
-        expected_sig: Option<ExpectedSig<'tcx>>,
-    ) -> Ty<'tcx> {
-        let tcx = self.tcx;
-        let body = tcx.hir().body(closure.body);
-
-        trace!("decl = {:#?}", closure.fn_decl);
-        let expr_def_id = closure.def_id;
-        debug!(?expr_def_id);
-
         let ClosureSignatures { bound_sig, liberated_sig } =
             self.sig_of_closure(expr_def_id, closure.fn_decl, closure.kind, expected_sig);
 
@@ -139,9 +123,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
         };
 
-        let mut fcx = FnCtxt::new(self, self.param_env, closure.def_id);
         check_fn(
-            &mut fcx,
+            &mut FnCtxt::new(self, self.param_env, closure.def_id),
             liberated_sig,
             coroutine_types,
             closure.fn_decl,
@@ -174,9 +157,9 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                     )
                 });
 
-                debug!(?sig, ?opt_kind);
+                debug!(?sig, ?expected_kind);
 
-                let closure_kind_ty = match opt_kind {
+                let closure_kind_ty = match expected_kind {
                     Some(kind) => Ty::from_closure_kind(tcx, kind),
 
                     // Create a type variable (for now) to represent the closure kind.
@@ -204,11 +187,11 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 let Some(CoroutineTypes { resume_ty, yield_ty }) = coroutine_types else {
                     bug!("expected coroutine to have yield/resume types");
                 };
-                let interior = fcx.next_ty_var(TypeVariableOrigin {
+                let interior = self.next_ty_var(TypeVariableOrigin {
                     kind: TypeVariableOriginKind::MiscVariable,
                     span: body.value.span,
                 });
-                fcx.deferred_coroutine_interiors.borrow_mut().push((
+                self.deferred_coroutine_interiors.borrow_mut().push((
                     expr_def_id,
                     body.id(),
                     interior,
@@ -364,36 +347,16 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         let tcx = self.tcx;
 
         let trait_def_id = projection.trait_def_id(tcx);
-
-        let is_fn = tcx.is_fn_trait(trait_def_id);
-
-        let coroutine_trait = tcx.lang_items().coroutine_trait();
-        let is_gen = coroutine_trait == Some(trait_def_id);
-
-        if !is_fn && !is_gen {
-            debug!("not fn or coroutine");
+        // For now, we only do signature deduction based off of the `Fn` traits.
+        if !tcx.is_fn_trait(trait_def_id) {
             return None;
         }
 
-        // Check that we deduce the signature from the `<_ as std::ops::Coroutine>::Return`
-        // associated item and not yield.
-        if is_gen && self.tcx.associated_item(projection.projection_def_id()).name != sym::Return {
-            debug!("not `Return` assoc item of `Coroutine`");
-            return None;
-        }
-
-        let input_tys = if is_fn {
-            let arg_param_ty = projection.skip_binder().projection_ty.args.type_at(1);
-            let arg_param_ty = self.resolve_vars_if_possible(arg_param_ty);
-            debug!(?arg_param_ty);
+        let arg_param_ty = projection.skip_binder().projection_ty.args.type_at(1);
+        let arg_param_ty = self.resolve_vars_if_possible(arg_param_ty);
+        debug!(?arg_param_ty);
 
-            match arg_param_ty.kind() {
-                &ty::Tuple(tys) => tys,
-                _ => return None,
-            }
-        } else {
-            // Coroutines with a `()` resume type may be defined with 0 or 1 explicit arguments,
-            // else they must have exactly 1 argument. For now though, just give up in this case.
+        let ty::Tuple(input_tys) = *arg_param_ty.kind() else {
             return None;
         };
 

compiler/rustc_middle/src/ty/util.rs

@@ -604,19 +604,15 @@ impl<'tcx> TyCtxt<'tcx> {
     /// wrapped in a binder.
     pub fn closure_env_ty(
         self,
-        closure_def_id: DefId,
-        closure_args: GenericArgsRef<'tcx>,
+        closure_ty: Ty<'tcx>,
+        closure_kind: ty::ClosureKind,
         env_region: ty::Region<'tcx>,
-    ) -> Option<Ty<'tcx>> {
-        let closure_ty = Ty::new_closure(self, closure_def_id, closure_args);
-        let closure_kind_ty = closure_args.as_closure().kind_ty();
-        let closure_kind = closure_kind_ty.to_opt_closure_kind()?;
-        let env_ty = match closure_kind {
+    ) -> Ty<'tcx> {
+        match closure_kind {
             ty::ClosureKind::Fn => Ty::new_imm_ref(self, env_region, closure_ty),
             ty::ClosureKind::FnMut => Ty::new_mut_ref(self, env_region, closure_ty),
             ty::ClosureKind::FnOnce => closure_ty,
-        };
-        Some(env_ty)
+        }
     }
 
     /// Returns `true` if the node pointed to by `def_id` is a `static` item.

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

@@ -117,50 +117,32 @@ impl<'tcx> Cx<'tcx> {
         pat_from_hir(self.tcx, self.param_env, self.typeck_results(), p)
     }
 
-    fn closure_env_param(&self, owner_def: LocalDefId, owner_id: HirId) -> Option<Param<'tcx>> {
-        match self.tcx.def_kind(owner_def) {
-            DefKind::Closure if self.tcx.is_coroutine(owner_def.to_def_id()) => {
-                let coroutine_ty = self.typeck_results.node_type(owner_id);
-                let coroutine_param = Param {
-                    ty: coroutine_ty,
-                    pat: None,
-                    ty_span: None,
-                    self_kind: None,
-                    hir_id: None,
-                };
-                Some(coroutine_param)
+    fn closure_env_param(&self, owner_def: LocalDefId, expr_id: HirId) -> Option<Param<'tcx>> {
+        if self.tcx.def_kind(owner_def) != DefKind::Closure {
+            return None;
+        }
+
+        let closure_ty = self.typeck_results.node_type(expr_id);
+        Some(match *closure_ty.kind() {
+            ty::Coroutine(..) => {
+                Param { ty: closure_ty, pat: None, ty_span: None, self_kind: None, hir_id: None }
             }
-            DefKind::Closure => {
-                let closure_ty = self.typeck_results.node_type(owner_id);
-
-                let ty::Closure(closure_def_id, closure_args) = *closure_ty.kind() else {
-                    bug!("closure expr does not have closure type: {:?}", closure_ty);
-                };
-
-                let bound_vars =
-                    self.tcx.mk_bound_variable_kinds(&[ty::BoundVariableKind::Region(ty::BrEnv)]);
-                let br = ty::BoundRegion {
-                    var: ty::BoundVar::from_usize(bound_vars.len() - 1),
-                    kind: ty::BrEnv,
-                };
-                let env_region = ty::Region::new_bound(self.tcx, ty::INNERMOST, br);
-                let closure_env_ty =
-                    self.tcx.closure_env_ty(closure_def_id, closure_args, env_region).unwrap();
-                let liberated_closure_env_ty = self.tcx.instantiate_bound_regions_with_erased(
-                    ty::Binder::bind_with_vars(closure_env_ty, bound_vars),
+            ty::Closure(_, closure_args) => {
+                let closure_env_ty = self.tcx.closure_env_ty(
+                    closure_ty,
+                    closure_args.as_closure().kind(),
+                    self.tcx.lifetimes.re_erased,
                 );
-                let env_param = Param {
-                    ty: liberated_closure_env_ty,
+                Param {
+                    ty: closure_env_ty,
                     pat: None,
                     ty_span: None,
                     self_kind: None,
                     hir_id: None,
-                };
-
-                Some(env_param)
+                }
             }
-            _ => None,
-        }
+            _ => bug!("unexpected closure type: {closure_ty}"),
+        })
     }
 
     fn explicit_params<'a>(

compiler/rustc_pattern_analysis/src/lib.rs

@@ -27,11 +27,9 @@ use rustc_middle::ty::Ty;
 #[cfg(feature = "rustc")]
 use rustc_span::ErrorGuaranteed;
 
-use crate::constructor::{Constructor, ConstructorSet};
+use crate::constructor::{Constructor, ConstructorSet, IntRange};
 #[cfg(feature = "rustc")]
-use crate::lints::{
-    lint_nonexhaustive_missing_variants, lint_overlapping_range_endpoints, PatternColumn,
-};
+use crate::lints::{lint_nonexhaustive_missing_variants, PatternColumn};
 use crate::pat::DeconstructedPat;
 #[cfg(feature = "rustc")]
 use crate::rustc::RustcMatchCheckCtxt;
@@ -77,6 +75,17 @@ pub trait TypeCx: Sized + fmt::Debug {
 
     /// Raise a bug.
     fn bug(&self, fmt: fmt::Arguments<'_>) -> !;
+
+    /// Lint that the range `pat` overlapped with all the ranges in `overlaps_with`, where the range
+    /// they overlapped over is `overlaps_on`. We only detect singleton overlaps.
+    /// The default implementation does nothing.
+    fn lint_overlapping_range_endpoints(
+        &self,
+        _pat: &DeconstructedPat<'_, Self>,
+        _overlaps_on: IntRange,
+        _overlaps_with: &[&DeconstructedPat<'_, Self>],
+    ) {
+    }
 }
 
 /// Context that provides information global to a match.
@@ -111,16 +120,10 @@ pub fn analyze_match<'p, 'tcx>(
 
     let report = compute_match_usefulness(cx, arms, scrut_ty, scrut_validity)?;
 
-    let pat_column = PatternColumn::new(arms);
-
-    // Lint ranges that overlap on their endpoints, which is likely a mistake.
-    if !report.overlapping_range_endpoints.is_empty() {
-        lint_overlapping_range_endpoints(cx, &report.overlapping_range_endpoints);
-    }
-
     // Run the non_exhaustive_omitted_patterns lint. Only run on refutable patterns to avoid hitting
     // `if let`s. Only run if the match is exhaustive otherwise the error is redundant.
     if tycx.refutable && report.non_exhaustiveness_witnesses.is_empty() {
+        let pat_column = PatternColumn::new(arms);
         lint_nonexhaustive_missing_variants(cx, arms, &pat_column, scrut_ty)?;
     }
 

compiler/rustc_pattern_analysis/src/lints.rs

@@ -1,14 +1,11 @@
-use rustc_session::lint;
 use rustc_session::lint::builtin::NON_EXHAUSTIVE_OMITTED_PATTERNS;
 use rustc_span::ErrorGuaranteed;
 
-use crate::errors::{
-    self, NonExhaustiveOmittedPattern, NonExhaustiveOmittedPatternLintOnArm, Uncovered,
-};
+use crate::errors::{NonExhaustiveOmittedPattern, NonExhaustiveOmittedPatternLintOnArm, Uncovered};
 use crate::pat::PatOrWild;
 use crate::rustc::{
-    self, Constructor, DeconstructedPat, MatchArm, MatchCtxt, PlaceCtxt, RevealedTy,
-    RustcMatchCheckCtxt, SplitConstructorSet, WitnessPat,
+    Constructor, DeconstructedPat, MatchArm, MatchCtxt, PlaceCtxt, RevealedTy, RustcMatchCheckCtxt,
+    SplitConstructorSet, WitnessPat,
 };
 
 /// A column of patterns in the matrix, where a column is the intuitive notion of "subpatterns that
@@ -196,26 +193,3 @@ pub(crate) fn lint_nonexhaustive_missing_variants<'a, 'p, 'tcx>(
     }
     Ok(())
 }
-
-pub(crate) fn lint_overlapping_range_endpoints<'a, 'p, 'tcx>(
-    cx: MatchCtxt<'a, 'p, 'tcx>,
-    overlapping_range_endpoints: &[rustc::OverlappingRanges<'p, 'tcx>],
-) {
-    let rcx = cx.tycx;
-    for overlap in overlapping_range_endpoints {
-        let overlap_as_pat = rcx.hoist_pat_range(&overlap.overlaps_on, overlap.pat.ty());
-        let overlaps: Vec<_> = overlap
-            .overlaps_with
-            .iter()
-            .map(|pat| pat.data().unwrap().span)
-            .map(|span| errors::Overlap { range: overlap_as_pat.clone(), span })
-            .collect();
-        let pat_span = overlap.pat.data().unwrap().span;
-        rcx.tcx.emit_spanned_lint(
-            lint::builtin::OVERLAPPING_RANGE_ENDPOINTS,
-            rcx.match_lint_level,
-            pat_span,
-            errors::OverlappingRangeEndpoints { overlap: overlaps, range: pat_span },
-        );
-    }
-}

compiler/rustc_pattern_analysis/src/rustc.rs

@@ -1,28 +1,26 @@
+use smallvec::SmallVec;
 use std::fmt;
 use std::iter::once;
 
 use rustc_arena::{DroplessArena, TypedArena};
 use rustc_data_structures::captures::Captures;
 use rustc_hir::def_id::DefId;
 use rustc_hir::HirId;
-use rustc_index::Idx;
-use rustc_index::IndexVec;
+use rustc_index::{Idx, IndexVec};
 use rustc_middle::middle::stability::EvalResult;
 use rustc_middle::mir::interpret::Scalar;
 use rustc_middle::mir::{self, Const};
 use rustc_middle::thir::{FieldPat, Pat, PatKind, PatRange, PatRangeBoundary};
 use rustc_middle::ty::layout::IntegerExt;
-use rustc_middle::ty::TypeVisitableExt;
-use rustc_middle::ty::{self, OpaqueTypeKey, Ty, TyCtxt, VariantDef};
-use rustc_span::ErrorGuaranteed;
-use rustc_span::{Span, DUMMY_SP};
+use rustc_middle::ty::{self, OpaqueTypeKey, Ty, TyCtxt, TypeVisitableExt, VariantDef};
+use rustc_session::lint;
+use rustc_span::{ErrorGuaranteed, Span, DUMMY_SP};
 use rustc_target::abi::{FieldIdx, Integer, VariantIdx, FIRST_VARIANT};
-use smallvec::SmallVec;
 
 use crate::constructor::{
     IntRange, MaybeInfiniteInt, OpaqueId, RangeEnd, Slice, SliceKind, VariantVisibility,
 };
-use crate::TypeCx;
+use crate::{errors, TypeCx};
 
 use crate::constructor::Constructor::*;
 
@@ -34,8 +32,6 @@ pub type DeconstructedPat<'p, 'tcx> =
     crate::pat::DeconstructedPat<'p, RustcMatchCheckCtxt<'p, 'tcx>>;
 pub type MatchArm<'p, 'tcx> = crate::MatchArm<'p, RustcMatchCheckCtxt<'p, 'tcx>>;
 pub type MatchCtxt<'a, 'p, 'tcx> = crate::MatchCtxt<'a, RustcMatchCheckCtxt<'p, 'tcx>>;
-pub type OverlappingRanges<'p, 'tcx> =
-    crate::usefulness::OverlappingRanges<'p, RustcMatchCheckCtxt<'p, 'tcx>>;
 pub(crate) type PlaceCtxt<'a, 'p, 'tcx> =
     crate::usefulness::PlaceCtxt<'a, RustcMatchCheckCtxt<'p, 'tcx>>;
 pub(crate) type SplitConstructorSet<'p, 'tcx> =
@@ -991,6 +987,27 @@ impl<'p, 'tcx> TypeCx for RustcMatchCheckCtxt<'p, 'tcx> {
     fn bug(&self, fmt: fmt::Arguments<'_>) -> ! {
         span_bug!(self.scrut_span, "{}", fmt)
     }
+
+    fn lint_overlapping_range_endpoints(
+        &self,
+        pat: &crate::pat::DeconstructedPat<'_, Self>,
+        overlaps_on: IntRange,
+        overlaps_with: &[&crate::pat::DeconstructedPat<'_, Self>],
+    ) {
+        let overlap_as_pat = self.hoist_pat_range(&overlaps_on, pat.ty());
+        let overlaps: Vec<_> = overlaps_with
+            .iter()
+            .map(|pat| pat.data().unwrap().span)
+            .map(|span| errors::Overlap { range: overlap_as_pat.clone(), span })
+            .collect();
+        let pat_span = pat.data().unwrap().span;
+        self.tcx.emit_spanned_lint(
+            lint::builtin::OVERLAPPING_RANGE_ENDPOINTS,
+            self.match_lint_level,
+            pat_span,
+            errors::OverlappingRangeEndpoints { overlap: overlaps, range: pat_span },
+        );
+    }
 }
 
 /// Recursively expand this pattern into its subpatterns. Only useful for or-patterns.