Auto merge of #111895 - matthiaskrgr:rollup-9a6szng, r=matthiaskrgr

Rollup of 5 pull requests

Successful merges:

 - #111861 (Don't ICE on return-type notation when promoting trait preds to associated type bounds)
 - #111864 (Always require closure parameters to be `Sized`)
 - #111870 (Rename `traits_in_crate` query to `traits`)
 - #111880 (Don't ICE when computing PointerLike trait when region vars are in param-env)
 - #111887 (Add regression tests for pretty-printing inherent projections)

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

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -427,6 +427,8 @@ pub(super) fn explicit_predicates_of<'tcx>(
             //   supertrait).
             if let ty::Alias(ty::Projection, projection) = ty.kind() {
                 projection.substs == trait_identity_substs
+                    // FIXME(return_type_notation): This check should be more robust
+                    && !tcx.is_impl_trait_in_trait(projection.def_id)
                     && tcx.associated_item(projection.def_id).container_id(tcx)
                         == def_id.to_def_id()
             } else {

compiler/rustc_hir_typeck/src/check.rs

@@ -32,6 +32,7 @@ pub(super) fn check_fn<'a, 'tcx>(
     fn_def_id: LocalDefId,
     body: &'tcx hir::Body<'tcx>,
     can_be_generator: Option<hir::Movability>,
+    params_can_be_unsized: bool,
 ) -> Option<GeneratorTypes<'tcx>> {
     let fn_id = fcx.tcx.hir().local_def_id_to_hir_id(fn_def_id);
 
@@ -94,7 +95,7 @@ pub(super) fn check_fn<'a, 'tcx>(
         // The check for a non-trivial pattern is a hack to avoid duplicate warnings
         // for simple cases like `fn foo(x: Trait)`,
         // where we would error once on the parameter as a whole, and once on the binding `x`.
-        if param.pat.simple_ident().is_none() && !tcx.features().unsized_fn_params {
+        if param.pat.simple_ident().is_none() && !params_can_be_unsized {
             fcx.require_type_is_sized(param_ty, param.pat.span, traits::SizedArgumentType(ty_span));
         }
 

compiler/rustc_hir_typeck/src/closure.rs

@@ -89,6 +89,8 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
             expr_def_id,
             body,
             closure.movability,
+            // Closure "rust-call" ABI doesn't support unsized params
+            false,
         );
 
         let parent_substs = InternalSubsts::identity_for_item(

compiler/rustc_hir_typeck/src/lib.rs

@@ -212,7 +212,7 @@ fn typeck_with_fallback<'tcx>(
         let fn_sig = tcx.liberate_late_bound_regions(def_id.to_def_id(), fn_sig);
         let fn_sig = fcx.normalize(body.value.span, fn_sig);
 
-        check_fn(&mut fcx, fn_sig, decl, def_id, body, None);
+        check_fn(&mut fcx, fn_sig, decl, def_id, body, None, tcx.features().unsized_fn_params);
     } else {
         let expected_type = if let Some(&hir::Ty { kind: hir::TyKind::Infer, span, .. }) = body_ty {
             Some(fcx.next_ty_var(TypeVariableOrigin {

compiler/rustc_metadata/src/rmeta/decoder/cstore_impl.rs

@@ -323,7 +323,7 @@ provide! { tcx, def_id, other, cdata,
 
     extra_filename => { cdata.root.extra_filename.clone() }
 
-    traits_in_crate => { tcx.arena.alloc_from_iter(cdata.get_traits()) }
+    traits => { tcx.arena.alloc_from_iter(cdata.get_traits()) }
     trait_impls_in_crate => { tcx.arena.alloc_from_iter(cdata.get_trait_impls()) }
     implementations_of_trait => { cdata.get_implementations_of_trait(tcx, other) }
     crate_incoherent_impls => { cdata.get_incoherent_impls(tcx, other) }

compiler/rustc_metadata/src/rmeta/encoder.rs

@@ -1938,7 +1938,7 @@ impl<'a, 'tcx> EncodeContext<'a, 'tcx> {
 
     fn encode_traits(&mut self) -> LazyArray<DefIndex> {
         empty_proc_macro!(self);
-        self.lazy_array(self.tcx.traits_in_crate(LOCAL_CRATE).iter().map(|def_id| def_id.index))
+        self.lazy_array(self.tcx.traits(LOCAL_CRATE).iter().map(|def_id| def_id.index))
     }
 
     /// Encodes an index, mapping each trait to its (local) implementations.
@@ -2329,7 +2329,7 @@ pub fn provide(providers: &mut Providers) {
                 .get(&def_id)
                 .expect("no traits in scope for a doc link")
         },
-        traits_in_crate: |tcx, LocalCrate| {
+        traits: |tcx, LocalCrate| {
             let mut traits = Vec::new();
             for id in tcx.hir().items() {
                 if matches!(tcx.def_kind(id.owner_id), DefKind::Trait | DefKind::TraitAlias) {

compiler/rustc_middle/src/query/mod.rs

@@ -38,7 +38,10 @@ use crate::traits::query::{
     OutlivesBound,
 };
 use crate::traits::specialization_graph;
-use crate::traits::{self, ImplSource};
+use crate::traits::{
+    CanonicalChalkEnvironmentAndGoal, CodegenObligationError, EvaluationResult, ImplSource,
+    ObjectSafetyViolation, ObligationCause, OverflowError, WellFormedLoc,
+};
 use crate::ty::fast_reject::SimplifiedType;
 use crate::ty::layout::ValidityRequirement;
 use crate::ty::subst::{GenericArg, SubstsRef};
@@ -1273,7 +1276,7 @@ rustc_queries! {
 
     query codegen_select_candidate(
         key: (ty::ParamEnv<'tcx>, ty::PolyTraitRef<'tcx>)
-    ) -> Result<&'tcx ImplSource<'tcx, ()>, traits::CodegenObligationError> {
+    ) -> Result<&'tcx ImplSource<'tcx, ()>, CodegenObligationError> {
         cache_on_disk_if { true }
         desc { |tcx| "computing candidate for `{}`", key.1 }
     }
@@ -1294,7 +1297,7 @@ rustc_queries! {
         desc { |tcx| "building specialization graph of trait `{}`", tcx.def_path_str(trait_id) }
         cache_on_disk_if { true }
     }
-    query object_safety_violations(trait_id: DefId) -> &'tcx [traits::ObjectSafetyViolation] {
+    query object_safety_violations(trait_id: DefId) -> &'tcx [ObjectSafetyViolation] {
         desc { |tcx| "determining object safety of trait `{}`", tcx.def_path_str(trait_id) }
     }
     query check_is_object_safe(trait_id: DefId) -> bool {
@@ -1838,8 +1841,7 @@ rustc_queries! {
     }
 
     /// A list of all traits in a crate, used by rustdoc and error reporting.
-    /// NOTE: Not named just `traits` due to a naming conflict.
-    query traits_in_crate(_: CrateNum) -> &'tcx [DefId] {
+    query traits(_: CrateNum) -> &'tcx [DefId] {
         desc { "fetching all traits in a crate" }
         separate_provide_extern
     }
@@ -1953,12 +1955,12 @@ rustc_queries! {
     /// `infcx.predicate_must_hold()` instead.
     query evaluate_obligation(
         goal: CanonicalPredicateGoal<'tcx>
-    ) -> Result<traits::EvaluationResult, traits::OverflowError> {
+    ) -> Result<EvaluationResult, OverflowError> {
         desc { "evaluating trait selection obligation `{}`", goal.value.value }
     }
 
     query evaluate_goal(
-        goal: traits::CanonicalChalkEnvironmentAndGoal<'tcx>
+        goal: CanonicalChalkEnvironmentAndGoal<'tcx>
     ) -> Result<
         &'tcx Canonical<'tcx, canonical::QueryResponse<'tcx, ()>>,
         NoSolution
@@ -2128,8 +2130,8 @@ rustc_queries! {
     /// all of the cases that the normal `ty::Ty`-based wfcheck does. This is fine,
     /// because the `ty::Ty`-based wfcheck is always run.
     query diagnostic_hir_wf_check(
-        key: (ty::Predicate<'tcx>, traits::WellFormedLoc)
-    ) -> &'tcx Option<traits::ObligationCause<'tcx>> {
+        key: (ty::Predicate<'tcx>, WellFormedLoc)
+    ) -> &'tcx Option<ObligationCause<'tcx>> {
         arena_cache
         eval_always
         no_hash

compiler/rustc_middle/src/ty/context.rs

@@ -1199,7 +1199,7 @@ impl<'tcx> TyCtxt<'tcx> {
     pub fn all_traits(self) -> impl Iterator<Item = DefId> + 'tcx {
         iter::once(LOCAL_CRATE)
             .chain(self.crates(()).iter().copied())
-            .flat_map(move |cnum| self.traits_in_crate(cnum).iter().copied())
+            .flat_map(move |cnum| self.traits(cnum).iter().copied())
     }
 
     #[inline]

compiler/rustc_trait_selection/src/solve/trait_goals.rs

@@ -177,14 +177,18 @@ impl<'tcx> assembly::GoalKind<'tcx> for TraitPredicate<'tcx> {
             return Err(NoSolution);
         }
 
-        if goal.predicate.self_ty().has_non_region_infer() {
+        // The regions of a type don't affect the size of the type
+        let tcx = ecx.tcx();
+        // We should erase regions from both the param-env and type, since both
+        // may have infer regions. Specifically, after canonicalizing and instantiating,
+        // early bound regions turn into region vars in both the new and old solver.
+        let key = tcx.erase_regions(goal.param_env.and(goal.predicate.self_ty()));
+        // But if there are inference variables, we have to wait until it's resolved.
+        if key.has_non_region_infer() {
             return ecx.evaluate_added_goals_and_make_canonical_response(Certainty::AMBIGUOUS);
         }
 
-        let tcx = ecx.tcx();
-        let self_ty = tcx.erase_regions(goal.predicate.self_ty());
-
-        if let Ok(layout) = tcx.layout_of(goal.param_env.and(self_ty))
+        if let Ok(layout) = tcx.layout_of(key)
             && layout.layout.is_pointer_like(&tcx.data_layout)
         {
             // FIXME: We could make this faster by making a no-constraints response

compiler/rustc_trait_selection/src/traits/select/candidate_assembly.rs

@@ -967,16 +967,18 @@ impl<'cx, 'tcx> SelectionContext<'cx, 'tcx> {
     ) {
         // The regions of a type don't affect the size of the type
         let tcx = self.tcx();
-        let self_ty =
-            tcx.erase_regions(tcx.erase_late_bound_regions(obligation.predicate.self_ty()));
-
+        let self_ty = tcx.erase_late_bound_regions(obligation.predicate.self_ty());
+        // We should erase regions from both the param-env and type, since both
+        // may have infer regions. Specifically, after canonicalizing and instantiating,
+        // early bound regions turn into region vars in both the new and old solver.
+        let key = tcx.erase_regions(obligation.param_env.and(self_ty));
         // But if there are inference variables, we have to wait until it's resolved.
-        if self_ty.has_non_region_infer() {
+        if key.has_non_region_infer() {
             candidates.ambiguous = true;
             return;
         }
 
-        if let Ok(layout) = tcx.layout_of(obligation.param_env.and(self_ty))
+        if let Ok(layout) = tcx.layout_of(key)
             && layout.layout.is_pointer_like(&tcx.data_layout)
         {
             candidates.vec.push(BuiltinCandidate { has_nested: false });

tests/ui/associated-inherent-types/issue-111879-0.rs

@@ -0,0 +1,14 @@
+#![feature(inherent_associated_types)]
+#![allow(incomplete_features)]
+
+// Check that we don't crash when printing inherent projections in diagnostics.
+
+pub struct Carrier<'a>(&'a ());
+
+pub type User = for<'b> fn(Carrier<'b>::Focus<i32>);
+
+impl<'a> Carrier<'a> {
+    pub type Focus<T> = &'a mut User; //~ ERROR overflow evaluating associated type
+}
+
+fn main() {}

tests/ui/associated-inherent-types/issue-111879-0.stderr

@@ -0,0 +1,8 @@
+error: overflow evaluating associated type `Carrier<'b>::Focus<i32>`
+  --> $DIR/issue-111879-0.rs:11:25
+   |
+LL |     pub type Focus<T> = &'a mut User;
+   |                         ^^^^^^^^^^^^
+
+error: aborting due to previous error
+

tests/ui/associated-inherent-types/issue-111879-1.rs

@@ -0,0 +1,12 @@
+#![feature(inherent_associated_types)]
+#![allow(incomplete_features)]
+
+// Check that we don't crash when printing inherent projections in diagnostics.
+
+struct Foo<T>(T);
+
+impl<'a> Foo<fn(&'a ())> {
+    type Assoc = &'a ();
+}
+
+fn main(_: for<'a> fn(Foo<fn(&'a ())>::Assoc)) {} //~ ERROR `main` function has wrong type

tests/ui/associated-inherent-types/issue-111879-1.stderr

@@ -0,0 +1,12 @@
+error[E0580]: `main` function has wrong type
+  --> $DIR/issue-111879-1.rs:12:1
+   |
+LL | fn main(_: for<'a> fn(Foo<fn(&'a ())>::Assoc)) {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ incorrect number of function parameters
+   |
+   = note: expected fn pointer `fn()`
+              found fn pointer `fn(for<'a> fn(Foo<fn(&'a ())>::Assoc))`
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0580`.

tests/ui/async-await/return-type-notation/supertrait-bound.rs

@@ -0,0 +1,11 @@
+// check-pass
+
+#![feature(return_position_impl_trait_in_trait, return_type_notation)]
+//~^ WARN the feature `return_type_notation` is incomplete and may not be safe to use
+
+trait IntFactory {
+    fn stream(&self) -> impl Iterator<Item = i32>;
+}
+trait SendIntFactory: IntFactory<stream(): Send> + Send {}
+
+fn main() {}

tests/ui/async-await/return-type-notation/supertrait-bound.stderr

@@ -0,0 +1,11 @@
+warning: the feature `return_type_notation` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/supertrait-bound.rs:3:49
+   |
+LL | #![feature(return_position_impl_trait_in_trait, return_type_notation)]
+   |                                                 ^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: see issue #109417 <https://github.com/rust-lang/rust/issues/109417> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+warning: 1 warning emitted
+

tests/ui/dyn-star/param-env-infer.current.stderr

@@ -0,0 +1,18 @@
+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/param-env-infer.rs:5:12
+   |
+LL | #![feature(dyn_star, pointer_like_trait)]
+   |            ^^^^^^^^
+   |
+   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0282]: type annotations needed
+  --> $DIR/param-env-infer.rs:12:10
+   |
+LL |     t as _
+   |          ^ cannot infer type
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0282`.

tests/ui/dyn-star/param-env-infer.next.stderr

@@ -0,0 +1,18 @@
+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/param-env-infer.rs:5:12
+   |
+LL | #![feature(dyn_star, pointer_like_trait)]
+   |            ^^^^^^^^
+   |
+   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0282]: type annotations needed
+  --> $DIR/param-env-infer.rs:12:10
+   |
+LL |     t as _
+   |          ^ cannot infer type
+
+error: aborting due to previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0282`.

tests/ui/dyn-star/param-env-infer.rs

@@ -0,0 +1,16 @@
+// revisions: current next
+//[next] compile-flags: -Ztrait-solver=next
+// incremental
+
+#![feature(dyn_star, pointer_like_trait)]
+//~^ WARN the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+
+use std::fmt::Debug;
+use std::marker::PointerLike;
+
+fn make_dyn_star<'a, T: PointerLike + Debug + 'a>(t: T) -> impl PointerLike + Debug + 'a {
+    t as _
+    //~^ ERROR type annotations needed
+}
+
+fn main() {}

tests/ui/unsized-locals/issue-67981.rs

@@ -0,0 +1,9 @@
+#![feature(unsized_fn_params)]
+
+fn main() {
+    let f: fn([u8]) = |_| {};
+    //~^ERROR the size for values of type `[u8]` cannot be known at compilation time
+    let slice: Box<[u8]> = Box::new([1; 8]);
+
+    f(*slice);
+}

tests/ui/unsized-locals/issue-67981.stderr

@@ -0,0 +1,15 @@
+error[E0277]: the size for values of type `[u8]` cannot be known at compilation time
+  --> $DIR/issue-67981.rs:4:24
+   |
+LL |     let f: fn([u8]) = |_| {};
+   |                        ^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `[u8]`
+help: function arguments must have a statically known size, borrowed types always have a known size
+   |
+LL |     let f: fn([u8]) = |&_| {};
+   |                        +
+
+error: aborting due to previous error
+
+For more information about this error, try `rustc --explain E0277`.