Rollup of 6 pull requests

.github/workflows/ci.yml

@@ -41,16 +41,24 @@ jobs:
       TOOLSTATE_REPO: "/~https://github.com/rust-lang-nursery/rust-toolstate"
       CACHE_DOMAIN: ci-caches.rust-lang.org
     if: "github.event_name == 'pull_request'"
+    continue-on-error: "${{ matrix.tidy }}"
     strategy:
       matrix:
         include:
           - name: mingw-check
+            tidy: false
+            os: ubuntu-20.04-xl
+            env: {}
+          - name: mingw-check-tidy
+            tidy: true
             os: ubuntu-20.04-xl
             env: {}
           - name: x86_64-gnu-llvm-13
+            tidy: false
             os: ubuntu-20.04-xl
             env: {}
           - name: x86_64-gnu-tools
+            tidy: false
             env:
               CI_ONLY_WHEN_SUBMODULES_CHANGED: 1
             os: ubuntu-20.04-xl

compiler/rustc_hir_typeck/src/callee.rs

@@ -399,6 +399,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             }
             ty::FnPtr(sig) => (sig, None),
             _ => {
+                for arg in arg_exprs {
+                    self.check_expr(arg);
+                }
+
                 if let hir::ExprKind::Path(hir::QPath::Resolved(_, path)) = &callee_expr.kind
                     && let [segment] = path.segments
                     && let Some(mut diag) = self
@@ -486,7 +490,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         expected: Expectation<'tcx>,
     ) -> Option<Ty<'tcx>> {
         if let [callee_expr, rest @ ..] = arg_exprs {
-            let callee_ty = self.check_expr(callee_expr);
+            let callee_ty = self.typeck_results.borrow().expr_ty_adjusted_opt(callee_expr)?;
+
             // First, do a probe with `IsSuggestion(true)` to avoid emitting
             // any strange errors. If it's successful, then we'll do a true
             // method lookup.

compiler/rustc_infer/src/infer/canonical/query_response.rs

@@ -151,7 +151,11 @@ impl<'tcx> InferCtxt<'tcx> {
         })
     }
 
-    fn take_opaque_types_for_query_response(&self) -> Vec<(Ty<'tcx>, Ty<'tcx>)> {
+    /// FIXME: This method should only be used for canonical queries and therefore be private.
+    ///
+    /// As the new solver does canonicalization slightly differently, this is also used there
+    /// for now. This should hopefully change fairly soon.
+    pub fn take_opaque_types_for_query_response(&self) -> Vec<(Ty<'tcx>, Ty<'tcx>)> {
         self.inner
             .borrow_mut()
             .opaque_type_storage

compiler/rustc_metadata/src/locator.rs

@@ -1011,11 +1011,7 @@ impl CrateError {
                 sess.emit_err(SymbolConflictsOthers { span, crate_name: root_name });
             }
             CrateError::StableCrateIdCollision(crate_name0, crate_name1) => {
-                sess.emit_err(StableCrateIdCollision {
-                    span,
-                    crate_name0: crate_name0,
-                    crate_name1: crate_name1,
-                });
+                sess.emit_err(StableCrateIdCollision { span, crate_name0, crate_name1 });
             }
             CrateError::DlOpen(s) | CrateError::DlSym(s) => {
                 sess.emit_err(DlError { span, err: s });
@@ -1074,7 +1070,7 @@ impl CrateError {
                     }
                     sess.emit_err(NoCrateWithTriple {
                         span,
-                        crate_name: crate_name,
+                        crate_name,
                         locator_triple: locator.triple.triple(),
                         add_info,
                         found_crates,

compiler/rustc_metadata/src/rmeta/decoder.rs

@@ -78,10 +78,6 @@ pub(crate) struct CrateMetadata {
     blob: MetadataBlob,
 
     // --- Some data pre-decoded from the metadata blob, usually for performance ---
-    /// NOTE(eddyb) we pass `'static` to a `'tcx` parameter because this
-    /// lifetime is only used behind `LazyValue`, `LazyArray`, or `LazyTable`, and therefore acts like a
-    /// universal (`for<'tcx>`), that is paired up with whichever `TyCtxt`
-    /// is being used to decode those values.
     root: CrateRoot,
     /// Trait impl data.
     /// FIXME: Used only from queries and can use query cache,
@@ -688,10 +684,10 @@ impl MetadataBlob {
     pub(crate) fn get_root(&self) -> CrateRoot {
         let slice = &self.blob()[..];
         let offset = METADATA_HEADER.len();
-        let pos = (((slice[offset + 0] as u32) << 24)
-            | ((slice[offset + 1] as u32) << 16)
-            | ((slice[offset + 2] as u32) << 8)
-            | ((slice[offset + 3] as u32) << 0)) as usize;
+
+        let pos_bytes = slice[offset..][..4].try_into().unwrap();
+        let pos = u32::from_be_bytes(pos_bytes) as usize;
+
         LazyValue::<CrateRoot>::from_position(NonZeroUsize::new(pos).unwrap()).decode(self)
     }
 
@@ -702,16 +698,14 @@ impl MetadataBlob {
         writeln!(out, "hash {} stable_crate_id {:?}", root.hash, root.stable_crate_id)?;
         writeln!(out, "proc_macro {:?}", root.proc_macro_data.is_some())?;
         writeln!(out, "=External Dependencies=")?;
+
         for (i, dep) in root.crate_deps.decode(self).enumerate() {
+            let CrateDep { name, extra_filename, hash, host_hash, kind } = dep;
+            let number = i + 1;
+
             writeln!(
                 out,
-                "{} {}{} hash {} host_hash {:?} kind {:?}",
-                i + 1,
-                dep.name,
-                dep.extra_filename,
-                dep.hash,
-                dep.host_hash,
-                dep.kind
+                "{number} {name}{extra_filename} hash {hash} host_hash {host_hash:?} kind {kind:?}"
             )?;
         }
         write!(out, "\n")?;

compiler/rustc_metadata/src/rmeta/mod.rs

@@ -416,11 +416,6 @@ struct VariantData {
     is_non_exhaustive: bool,
 }
 
-#[derive(TyEncodable, TyDecodable)]
-struct GeneratorData<'tcx> {
-    layout: mir::GeneratorLayout<'tcx>,
-}
-
 // Tags used for encoding Spans:
 const TAG_VALID_SPAN_LOCAL: u8 = 0;
 const TAG_VALID_SPAN_FOREIGN: u8 = 1;

compiler/rustc_middle/src/infer/canonical.rs

@@ -300,6 +300,16 @@ impl<'tcx, V> Canonical<'tcx, V> {
         let Canonical { max_universe, variables, value } = self;
         Canonical { max_universe, variables, value: map_op(value) }
     }
+
+    /// Allows you to map the `value` of a canonical while keeping the same set of
+    /// bound variables.
+    ///
+    /// **WARNING:** This function is very easy to mis-use, hence the name! See
+    /// the comment of [Canonical::unchecked_map] for more details.
+    pub fn unchecked_rebind<W>(self, value: W) -> Canonical<'tcx, W> {
+        let Canonical { max_universe, variables, value: _ } = self;
+        Canonical { max_universe, variables, value }
+    }
 }
 
 pub type QueryOutlivesConstraint<'tcx> = (

compiler/rustc_middle/src/traits/query.rs

@@ -96,7 +96,7 @@ pub type CanonicalTypeOpProvePredicateGoal<'tcx> =
 pub type CanonicalTypeOpNormalizeGoal<'tcx, T> =
     Canonical<'tcx, ty::ParamEnvAnd<'tcx, type_op::Normalize<T>>>;
 
-#[derive(Copy, Clone, Debug, HashStable)]
+#[derive(Copy, Clone, Debug, HashStable, PartialEq, Eq)]
 pub struct NoSolution;
 
 pub type Fallible<T> = Result<T, NoSolution>;

compiler/rustc_middle/src/traits/specialization_graph.rs

@@ -180,6 +180,7 @@ impl Iterator for Ancestors<'_> {
 }
 
 /// Information about the most specialized definition of an associated item.
+#[derive(Debug)]
 pub struct LeafDef {
     /// The associated item described by this `LeafDef`.
     pub item: ty::AssocItem,

compiler/rustc_middle/src/ty/mod.rs

@@ -535,6 +535,17 @@ impl<'tcx> Predicate<'tcx> {
         self
     }
 
+    #[instrument(level = "debug", skip(tcx), ret)]
+    pub fn is_coinductive(self, tcx: TyCtxt<'tcx>) -> bool {
+        match self.kind().skip_binder() {
+            ty::PredicateKind::Clause(ty::Clause::Trait(data)) => {
+                tcx.trait_is_coinductive(data.def_id())
+            }
+            ty::PredicateKind::WellFormed(_) => true,
+            _ => false,
+        }
+    }
+
     /// Whether this projection can be soundly normalized.
     ///
     /// Wf predicates must not be normalized, as normalization
@@ -1018,6 +1029,24 @@ pub struct ProjectionPredicate<'tcx> {
     pub term: Term<'tcx>,
 }
 
+impl<'tcx> ProjectionPredicate<'tcx> {
+    pub fn self_ty(self) -> Ty<'tcx> {
+        self.projection_ty.self_ty()
+    }
+
+    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> ProjectionPredicate<'tcx> {
+        Self { projection_ty: self.projection_ty.with_self_ty(tcx, self_ty), ..self }
+    }
+
+    pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId {
+        self.projection_ty.trait_def_id(tcx)
+    }
+
+    pub fn def_id(self) -> DefId {
+        self.projection_ty.def_id
+    }
+}
+
 pub type PolyProjectionPredicate<'tcx> = Binder<'tcx, ProjectionPredicate<'tcx>>;
 
 impl<'tcx> PolyProjectionPredicate<'tcx> {
@@ -1054,18 +1083,6 @@ impl<'tcx> PolyProjectionPredicate<'tcx> {
     }
 }
 
-impl<'tcx> ProjectionPredicate<'tcx> {
-    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
-        Self {
-            projection_ty: tcx.mk_alias_ty(
-                self.projection_ty.def_id,
-                [self_ty.into()].into_iter().chain(self.projection_ty.substs.iter().skip(1)),
-            ),
-            ..self
-        }
-    }
-}
-
 pub trait ToPolyTraitRef<'tcx> {
     fn to_poly_trait_ref(&self) -> PolyTraitRef<'tcx>;
 }

compiler/rustc_middle/src/ty/sty.rs

@@ -1169,7 +1169,7 @@ pub struct AliasTy<'tcx> {
 }
 
 impl<'tcx> AliasTy<'tcx> {
-    pub fn trait_def_id(&self, tcx: TyCtxt<'tcx>) -> DefId {
+    pub fn trait_def_id(self, tcx: TyCtxt<'tcx>) -> DefId {
         match tcx.def_kind(self.def_id) {
             DefKind::AssocTy | DefKind::AssocConst => tcx.parent(self.def_id),
             DefKind::ImplTraitPlaceholder => {
@@ -1183,7 +1183,7 @@ impl<'tcx> AliasTy<'tcx> {
     /// For example, if this is a projection of `<T as StreamingIterator>::Item<'a>`,
     /// then this function would return a `T: Iterator` trait reference and `['a]` as the own substs
     pub fn trait_ref_and_own_substs(
-        &self,
+        self,
         tcx: TyCtxt<'tcx>,
     ) -> (ty::TraitRef<'tcx>, &'tcx [ty::GenericArg<'tcx>]) {
         debug_assert!(matches!(tcx.def_kind(self.def_id), DefKind::AssocTy | DefKind::AssocConst));
@@ -1202,14 +1202,18 @@ impl<'tcx> AliasTy<'tcx> {
     /// WARNING: This will drop the substs for generic associated types
     /// consider calling [Self::trait_ref_and_own_substs] to get those
     /// as well.
-    pub fn trait_ref(&self, tcx: TyCtxt<'tcx>) -> ty::TraitRef<'tcx> {
+    pub fn trait_ref(self, tcx: TyCtxt<'tcx>) -> ty::TraitRef<'tcx> {
         let def_id = self.trait_def_id(tcx);
         tcx.mk_trait_ref(def_id, self.substs.truncate_to(tcx, tcx.generics_of(def_id)))
     }
 
-    pub fn self_ty(&self) -> Ty<'tcx> {
+    pub fn self_ty(self) -> Ty<'tcx> {
         self.substs.type_at(0)
     }
+
+    pub fn with_self_ty(self, tcx: TyCtxt<'tcx>, self_ty: Ty<'tcx>) -> Self {
+        tcx.mk_alias_ty(self.def_id, [self_ty.into()].into_iter().chain(self.substs.iter().skip(1)))
+    }
 }
 
 #[derive(Copy, Clone, Debug, TypeFoldable, TypeVisitable, Lift)]

compiler/rustc_middle/src/ty/subst.rs

@@ -577,6 +577,10 @@ impl<T> EarlyBinder<T> {
     pub fn rebind<U>(&self, value: U) -> EarlyBinder<U> {
         EarlyBinder(value)
     }
+
+    pub fn skip_binder(self) -> T {
+        self.0
+    }
 }
 
 impl<T> EarlyBinder<Option<T>> {

compiler/rustc_trait_selection/src/lib.rs

@@ -19,6 +19,7 @@
 #![feature(let_chains)]
 #![feature(if_let_guard)]
 #![feature(never_type)]
+#![feature(result_option_inspect)]
 #![feature(type_alias_impl_trait)]
 #![recursion_limit = "512"] // For rustdoc
 
@@ -37,4 +38,5 @@ extern crate smallvec;
 pub mod autoderef;
 pub mod errors;
 pub mod infer;
+pub mod solve;
 pub mod traits;