make unevaluated const substs optional

Author: lcnr

compiler/rustc_codegen_cranelift/src/constant.rs

@@ -129,13 +129,13 @@ pub(crate) fn codegen_constant<'tcx>(
     };
     let const_val = match const_.val {
         ConstKind::Value(const_val) => const_val,
-        ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted })
-            if fx.tcx.is_static(def.did) =>
+        ConstKind::Unevaluated(uv)
+            if fx.tcx.is_static(uv.def.did) =>
         {
-            assert!(substs.is_empty());
-            assert!(promoted.is_none());
+            assert!(uv.substs(fx.tcx).is_empty());
+            assert!(uv.promoted.is_none());
 
-            return codegen_static_ref(fx, def.did, fx.layout_of(const_.ty)).to_cvalue(fx);
+            return codegen_static_ref(fx, uv.def.did, fx.layout_of(const_.ty)).to_cvalue(fx);
         }
         ConstKind::Unevaluated(unevaluated) => {
             match fx.tcx.const_eval_resolve(ParamEnv::reveal_all(), unevaluated, None) {

compiler/rustc_infer/src/infer/combine.rs

@@ -737,10 +737,9 @@ impl TypeRelation<'tcx> for Generalizer<'_, 'tcx> {
                     }
                 }
             }
-            ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted })
-                if self.tcx().lazy_normalization() =>
-            {
-                assert_eq!(promoted, None);
+            ty::ConstKind::Unevaluated(uv) if self.tcx().lazy_normalization() => {
+                assert_eq!(uv.promoted, None);
+                let substs = uv.substs(self.tcx());
                 let substs = self.relate_with_variance(
                     ty::Variance::Invariant,
                     ty::VarianceDiagInfo::default(),
@@ -749,7 +748,7 @@ impl TypeRelation<'tcx> for Generalizer<'_, 'tcx> {
                 )?;
                 Ok(self.tcx().mk_const(ty::Const {
                     ty: c.ty,
-                    val: ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }),
+                    val: ty::ConstKind::Unevaluated(ty::Unevaluated::new(uv.def, substs)),
                 }))
             }
             _ => relate::super_relate_consts(self, c, c),
@@ -971,10 +970,9 @@ impl TypeRelation<'tcx> for ConstInferUnifier<'_, 'tcx> {
                     }
                 }
             }
-            ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted })
-                if self.tcx().lazy_normalization() =>
-            {
-                assert_eq!(promoted, None);
+            ty::ConstKind::Unevaluated(uv) if self.tcx().lazy_normalization() => {
+                assert_eq!(uv.promoted, None);
+                let substs = uv.substs(self.tcx());
                 let substs = self.relate_with_variance(
                     ty::Variance::Invariant,
                     ty::VarianceDiagInfo::default(),
@@ -983,7 +981,7 @@ impl TypeRelation<'tcx> for ConstInferUnifier<'_, 'tcx> {
                 )?;
                 Ok(self.tcx().mk_const(ty::Const {
                     ty: c.ty,
-                    val: ty::ConstKind::Unevaluated(ty::Unevaluated { def, substs, promoted }),
+                    val: ty::ConstKind::Unevaluated(ty::Unevaluated::new(uv.def, substs)),
                 }))
             }
             _ => relate::super_relate_consts(self, c, c),

compiler/rustc_infer/src/infer/error_reporting/mod.rs

@@ -1517,8 +1517,8 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
         }
 
         impl<'tcx> ty::fold::TypeVisitor<'tcx> for OpaqueTypesVisitor<'tcx> {
-            fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
-                self.tcx
+            fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
+                Some(self.tcx)
             }
 
             fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {

compiler/rustc_infer/src/infer/error_reporting/nice_region_error/static_impl_trait.rs

@@ -473,8 +473,10 @@ impl<'a, 'tcx> NiceRegionError<'a, 'tcx> {
 struct TraitObjectVisitor(Vec<DefId>);
 
 impl<'tcx> TypeVisitor<'tcx> for TraitObjectVisitor {
-    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
-        bug!("tcx_for_anon_const_substs called for TraitObjectVisitor");
+    fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
+        // The default anon const substs cannot include
+        // trait objects, so we don't have to bother looking.
+        None
     }
 
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {

compiler/rustc_infer/src/infer/mod.rs

@@ -1487,16 +1487,16 @@ impl<'a, 'tcx> InferCtxt<'a, 'tcx> {
     pub fn const_eval_resolve(
         &self,
         param_env: ty::ParamEnv<'tcx>,
-        ty::Unevaluated { def, substs, promoted }: ty::Unevaluated<'tcx>,
+        unevaluated: ty::Unevaluated<'tcx>,
         span: Option<Span>,
     ) -> EvalToConstValueResult<'tcx> {
         let mut original_values = OriginalQueryValues::default();
-        let canonical = self.canonicalize_query((param_env, substs), &mut original_values);
+        let canonical = self.canonicalize_query((param_env, unevaluated), &mut original_values);
 
-        let (param_env, substs) = canonical.value;
+        let (param_env, unevaluated) = canonical.value;
         // The return value is the evaluated value which doesn't contain any reference to inference
         // variables, thus we don't need to substitute back the original values.
-        self.tcx.const_eval_resolve(param_env, ty::Unevaluated { def, substs, promoted }, span)
+        self.tcx.const_eval_resolve(param_env, unevaluated, span)
     }
 
     /// If `typ` is a type variable of some kind, resolve it one level

compiler/rustc_infer/src/infer/nll_relate/mod.rs

@@ -765,8 +765,8 @@ struct ScopeInstantiator<'me, 'tcx> {
 }
 
 impl<'me, 'tcx> TypeVisitor<'tcx> for ScopeInstantiator<'me, 'tcx> {
-    fn tcx_for_anon_const_substs<'a>(&'a self) -> TyCtxt<'tcx> {
-        self.tcx
+    fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
+        Some(self.tcx)
     }
 
     fn visit_binder<T: TypeFoldable<'tcx>>(

compiler/rustc_infer/src/infer/resolve.rs

@@ -127,8 +127,8 @@ impl<'a, 'tcx> UnresolvedTypeFinder<'a, 'tcx> {
 impl<'a, 'tcx> TypeVisitor<'tcx> for UnresolvedTypeFinder<'a, 'tcx> {
     type BreakTy = (Ty<'tcx>, Option<Span>);
 
-    fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
-        self.infcx.tcx
+    fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
+        Some(self.infcx.tcx)
     }
 
     fn visit_ty(&mut self, t: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {

compiler/rustc_lint/src/types.rs

@@ -1160,8 +1160,8 @@ impl<'a, 'tcx> ImproperCTypesVisitor<'a, 'tcx> {
 
         impl<'a, 'tcx> ty::fold::TypeVisitor<'tcx> for ProhibitOpaqueTypes<'a, 'tcx> {
             type BreakTy = Ty<'tcx>;
-            fn tcx_for_anon_const_substs(&self) -> TyCtxt<'tcx> {
-                self.cx.tcx
+            fn tcx_for_anon_const_substs(&self) -> Option<TyCtxt<'tcx>> {
+                Some(self.cx.tcx)
             }
 
             fn visit_ty(&mut self, ty: Ty<'tcx>) -> ControlFlow<Self::BreakTy> {

compiler/rustc_middle/src/mir/interpret/queries.rs

@@ -38,7 +38,7 @@ impl<'tcx> TyCtxt<'tcx> {
         ct: ty::Unevaluated<'tcx>,
         span: Option<Span>,
     ) -> EvalToConstValueResult<'tcx> {
-        match ty::Instance::resolve_opt_const_arg(self, param_env, ct.def, ct.substs) {
+        match ty::Instance::resolve_opt_const_arg(self, param_env, ct.def, ct.substs(self)) {
             Ok(Some(instance)) => {
                 let cid = GlobalId { instance, promoted: ct.promoted };
                 self.const_eval_global_id(param_env, cid, span)

compiler/rustc_middle/src/query/mod.rs

@@ -114,6 +114,10 @@ rustc_queries! {
         desc { |tcx| "compute const default for a given parameter `{}`", tcx.def_path_str(param)  }
     }
 
+    query default_anon_const_substs(key: DefId) -> SubstsRef<'tcx> {
+        desc { |tcx| "computing the default generic arguments for `{}`", tcx.def_path_str(key) }
+    }
+
     /// Records the type of every item.
     query type_of(key: DefId) -> Ty<'tcx> {
         desc { |tcx| "computing type of `{}`", tcx.def_path_str(key) }