[beta] backports

Cargo.lock

@@ -2315,9 +2315,9 @@ dependencies = [
 
 [[package]]
 name = "odht"
-version = "0.3.0"
+version = "0.3.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d2504d29fda40b3f2f9ef525392435ab660e407c188196cb664b116ebcca0142"
+checksum = "5a518809ac14b25b569624d0268eba1e88498f71615893dca57982bed7621abb"
 dependencies = [
  "cfg-if 1.0.0",
 ]

compiler/rustc_feature/src/active.rs

@@ -684,6 +684,9 @@ declare_features! (
     /// Allows using the `non_exhaustive_omitted_patterns` lint.
     (active, non_exhaustive_omitted_patterns_lint, "1.57.0", Some(89554), None),
 
+    /// Tells rustdoc to automatically generate `#[doc(cfg(...))]`.
+    (active, doc_auto_cfg, "1.57.0", Some(43781), None),
+
     // -------------------------------------------------------------------------
     // feature-group-end: actual feature gates
     // -------------------------------------------------------------------------

compiler/rustc_hir/Cargo.toml

@@ -17,4 +17,4 @@ rustc_serialize = { path = "../rustc_serialize" }
 rustc_ast = { path = "../rustc_ast" }
 tracing = "0.1"
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
-odht = { version = "0.3.0", features = ["nightly"] }
+odht = { version = "0.3.1", features = ["nightly"] }

compiler/rustc_lint/src/lib.rs

@@ -303,7 +303,6 @@ fn register_builtins(store: &mut LintStore, no_interleave_lints: bool) {
         UNUSED_LABELS,
         UNUSED_PARENS,
         UNUSED_BRACES,
-        MUST_NOT_SUSPEND,
         REDUNDANT_SEMICOLONS
     );
 

compiler/rustc_lint_defs/src/builtin.rs

@@ -323,6 +323,7 @@ declare_lint! {
     ///
     /// ```rust
     /// #![feature(must_not_suspend)]
+    /// #![warn(must_not_suspend)]
     ///
     /// #[must_not_suspend]
     /// struct SyncThing {}
@@ -349,8 +350,9 @@ declare_lint! {
     /// `MutexGuard`'s)
     ///
     pub MUST_NOT_SUSPEND,
-    Warn,
+    Allow,
     "use of a `#[must_not_suspend]` value across a yield point",
+    @feature_gate = rustc_span::symbol::sym::must_not_suspend;
 }
 
 declare_lint! {
@@ -3052,6 +3054,7 @@ declare_lint_pass! {
         BREAK_WITH_LABEL_AND_LOOP,
         UNUSED_ATTRIBUTES,
         NON_EXHAUSTIVE_OMITTED_PATTERNS,
+        TEXT_DIRECTION_CODEPOINT_IN_COMMENT,
         DEREF_INTO_DYN_SUPERTRAIT,
     ]
 }

compiler/rustc_metadata/Cargo.toml

@@ -8,7 +8,7 @@ doctest = false
 
 [dependencies]
 libc = "0.2"
-odht = { version = "0.3.0", features = ["nightly"] }
+odht = { version = "0.3.1", features = ["nightly"] }
 snap = "1"
 tracing = "0.1"
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }

compiler/rustc_span/src/symbol.rs

@@ -549,6 +549,7 @@ symbols! {
         div_assign,
         doc,
         doc_alias,
+        doc_auto_cfg,
         doc_cfg,
         doc_cfg_hide,
         doc_keyword,

compiler/rustc_target/src/spec/android_base.rs

@@ -1,7 +1,7 @@
 use crate::spec::{LinkerFlavor, TargetOptions};
 
 pub fn opts() -> TargetOptions {
-    let mut base = super::linux_gnu_base::opts();
+    let mut base = super::linux_base::opts();
     base.os = "android".to_string();
     // Many of the symbols defined in compiler-rt are also defined in libgcc.
     // Android's linker doesn't like that by default.

compiler/rustc_ty_utils/src/needs_drop.rs

@@ -12,14 +12,12 @@ use rustc_span::{sym, DUMMY_SP};
 type NeedsDropResult<T> = Result<T, AlwaysRequiresDrop>;
 
 fn needs_drop_raw<'tcx>(tcx: TyCtxt<'tcx>, query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>) -> bool {
-    let adt_components =
-        move |adt_def: &ty::AdtDef, _| tcx.adt_drop_tys(adt_def.did).map(|tys| tys.iter());
-
     // If we don't know a type doesn't need drop, for example if it's a type
     // parameter without a `Copy` bound, then we conservatively return that it
     // needs drop.
-    let res =
-        NeedsDropTypes::new(tcx, query.param_env, query.value, adt_components).next().is_some();
+    let adt_has_dtor =
+        |adt_def: &ty::AdtDef| adt_def.destructor(tcx).map(|_| DtorType::Significant);
+    let res = drop_tys_helper(tcx, query.value, query.param_env, adt_has_dtor).next().is_some();
 
     debug!("needs_drop_raw({:?}) = {:?}", query, res);
     res
@@ -29,12 +27,10 @@ fn has_significant_drop_raw<'tcx>(
     tcx: TyCtxt<'tcx>,
     query: ty::ParamEnvAnd<'tcx, Ty<'tcx>>,
 ) -> bool {
-    let significant_drop_fields = move |adt_def: &ty::AdtDef, _| {
-        tcx.adt_significant_drop_tys(adt_def.did).map(|tys| tys.iter())
-    };
-    let res = NeedsDropTypes::new(tcx, query.param_env, query.value, significant_drop_fields)
-        .next()
-        .is_some();
+    let res =
+        drop_tys_helper(tcx, query.value, query.param_env, adt_consider_insignificant_dtor(tcx))
+            .next()
+            .is_some();
     debug!("has_significant_drop_raw({:?}) = {:?}", query, res);
     res
 }
@@ -145,10 +141,8 @@ where
                             Ok(tys) => tys,
                         };
                         for required_ty in tys {
-                            let subst_ty = tcx.normalize_erasing_regions(
-                                self.param_env,
-                                required_ty.subst(tcx, substs),
-                            );
+                            let subst_ty =
+                                tcx.normalize_erasing_regions(self.param_env, required_ty);
                             queue_type(self, subst_ty);
                         }
                     }
@@ -187,23 +181,24 @@ enum DtorType {
 // Depending on the implentation of `adt_has_dtor`, it is used to check if the
 // ADT has a destructor or if the ADT only has a significant destructor. For
 // understanding significant destructor look at `adt_significant_drop_tys`.
-fn adt_drop_tys_helper<'tcx>(
+fn drop_tys_helper<'tcx>(
     tcx: TyCtxt<'tcx>,
-    def_id: DefId,
+    ty: Ty<'tcx>,
+    param_env: rustc_middle::ty::ParamEnv<'tcx>,
     adt_has_dtor: impl Fn(&ty::AdtDef) -> Option<DtorType>,
-) -> Result<&ty::List<Ty<'tcx>>, AlwaysRequiresDrop> {
+) -> impl Iterator<Item = NeedsDropResult<Ty<'tcx>>> {
     let adt_components = move |adt_def: &ty::AdtDef, substs: SubstsRef<'tcx>| {
         if adt_def.is_manually_drop() {
-            debug!("adt_drop_tys: `{:?}` is manually drop", adt_def);
+            debug!("drop_tys_helper: `{:?}` is manually drop", adt_def);
             return Ok(Vec::new().into_iter());
         } else if let Some(dtor_info) = adt_has_dtor(adt_def) {
             match dtor_info {
                 DtorType::Significant => {
-                    debug!("adt_drop_tys: `{:?}` implements `Drop`", adt_def);
+                    debug!("drop_tys_helper: `{:?}` implements `Drop`", adt_def);
                     return Err(AlwaysRequiresDrop);
                 }
                 DtorType::Insignificant => {
-                    debug!("adt_drop_tys: `{:?}` drop is insignificant", adt_def);
+                    debug!("drop_tys_helper: `{:?}` drop is insignificant", adt_def);
 
                     // Since the destructor is insignificant, we just want to make sure all of
                     // the passed in type parameters are also insignificant.
@@ -212,34 +207,27 @@ fn adt_drop_tys_helper<'tcx>(
                 }
             }
         } else if adt_def.is_union() {
-            debug!("adt_drop_tys: `{:?}` is a union", adt_def);
+            debug!("drop_tys_helper: `{:?}` is a union", adt_def);
             return Ok(Vec::new().into_iter());
         }
-        Ok(adt_def.all_fields().map(|field| tcx.type_of(field.did)).collect::<Vec<_>>().into_iter())
+        Ok(adt_def
+            .all_fields()
+            .map(|field| {
+                let r = tcx.type_of(field.did).subst(tcx, substs);
+                debug!("drop_tys_helper: Subst into {:?} with {:?} gettng {:?}", field, substs, r);
+                r
+            })
+            .collect::<Vec<_>>()
+            .into_iter())
     };
 
-    let adt_ty = tcx.type_of(def_id);
-    let param_env = tcx.param_env(def_id);
-    let res: Result<Vec<_>, _> =
-        NeedsDropTypes::new(tcx, param_env, adt_ty, adt_components).collect();
-
-    debug!("adt_drop_tys(`{}`) = `{:?}`", tcx.def_path_str(def_id), res);
-    res.map(|components| tcx.intern_type_list(&components))
+    NeedsDropTypes::new(tcx, param_env, ty, adt_components)
 }
 
-fn adt_drop_tys(tcx: TyCtxt<'_>, def_id: DefId) -> Result<&ty::List<Ty<'_>>, AlwaysRequiresDrop> {
-    // This is for the "needs_drop" query, that considers all `Drop` impls, therefore all dtors are
-    // significant.
-    let adt_has_dtor =
-        |adt_def: &ty::AdtDef| adt_def.destructor(tcx).map(|_| DtorType::Significant);
-    adt_drop_tys_helper(tcx, def_id, adt_has_dtor)
-}
-
-fn adt_significant_drop_tys(
-    tcx: TyCtxt<'_>,
-    def_id: DefId,
-) -> Result<&ty::List<Ty<'_>>, AlwaysRequiresDrop> {
-    let adt_has_dtor = |adt_def: &ty::AdtDef| {
+fn adt_consider_insignificant_dtor<'tcx>(
+    tcx: TyCtxt<'tcx>,
+) -> impl Fn(&ty::AdtDef) -> Option<DtorType> + 'tcx {
+    move |adt_def: &ty::AdtDef| {
         let is_marked_insig = tcx.has_attr(adt_def.did, sym::rustc_insignificant_dtor);
         if is_marked_insig {
             // In some cases like `std::collections::HashMap` where the struct is a wrapper around
@@ -256,8 +244,31 @@ fn adt_significant_drop_tys(
             // treat this as the simple case of Drop impl for type.
             None
         }
-    };
-    adt_drop_tys_helper(tcx, def_id, adt_has_dtor)
+    }
+}
+
+fn adt_drop_tys(tcx: TyCtxt<'_>, def_id: DefId) -> Result<&ty::List<Ty<'_>>, AlwaysRequiresDrop> {
+    // This is for the "adt_drop_tys" query, that considers all `Drop` impls, therefore all dtors are
+    // significant.
+    let adt_has_dtor =
+        |adt_def: &ty::AdtDef| adt_def.destructor(tcx).map(|_| DtorType::Significant);
+    drop_tys_helper(tcx, tcx.type_of(def_id), tcx.param_env(def_id), adt_has_dtor)
+        .collect::<Result<Vec<_>, _>>()
+        .map(|components| tcx.intern_type_list(&components))
+}
+
+fn adt_significant_drop_tys(
+    tcx: TyCtxt<'_>,
+    def_id: DefId,
+) -> Result<&ty::List<Ty<'_>>, AlwaysRequiresDrop> {
+    drop_tys_helper(
+        tcx,
+        tcx.type_of(def_id),
+        tcx.param_env(def_id),
+        adt_consider_insignificant_dtor(tcx),
+    )
+    .collect::<Result<Vec<_>, _>>()
+    .map(|components| tcx.intern_type_list(&components))
 }
 
 pub(crate) fn provide(providers: &mut ty::query::Providers) {

compiler/rustc_ty_utils/src/ty.rs

@@ -248,6 +248,7 @@ fn trait_of_item(tcx: TyCtxt<'_>, def_id: DefId) -> Option<DefId> {
 }
 
 /// See `ParamEnv` struct definition for details.
+#[instrument(level = "debug", skip(tcx))]
 fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
     // The param_env of an impl Trait type is its defining function's param_env
     if let Some(parent) = ty::is_impl_trait_defn(tcx, def_id) {
@@ -275,9 +276,20 @@ fn param_env(tcx: TyCtxt<'_>, def_id: DefId) -> ty::ParamEnv<'_> {
         predicates.extend(environment);
     }
 
+    // It's important that we include the default substs in unevaluated
+    // constants, since `Unevaluated` instances in predicates whose substs are None
+    // can lead to "duplicate" caller bounds candidates during trait selection,
+    // duplicate in the sense that both have their default substs, but the
+    // candidate that resulted from a superpredicate still uses `None` in its
+    // `substs_` field of `Unevaluated` to indicate that it has its default substs,
+    // whereas the other candidate has `substs_: Some(default_substs)`, see
+    // issue #89334
+    predicates = tcx.expose_default_const_substs(predicates);
+
     let unnormalized_env =
         ty::ParamEnv::new(tcx.intern_predicates(&predicates), traits::Reveal::UserFacing);
 
+    debug!("unnormalized_env caller bounds: {:?}", unnormalized_env.caller_bounds());
     let body_id = def_id
         .as_local()
         .map(|def_id| tcx.hir().local_def_id_to_hir_id(def_id))

compiler/rustc_typeck/src/check/expr.rs

@@ -1698,15 +1698,15 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                         // Save the index of all fields regardless of their visibility in case
                         // of error recovery.
                         self.write_field_index(expr.hir_id, index);
+                        let adjustments = self.adjust_steps(&autoderef);
                         if field.vis.is_accessible_from(def_scope, self.tcx) {
-                            let adjustments = self.adjust_steps(&autoderef);
                             self.apply_adjustments(base, adjustments);
                             self.register_predicates(autoderef.into_obligations());
 
                             self.tcx.check_stability(field.did, Some(expr.hir_id), expr.span, None);
                             return field_ty;
                         }
-                        private_candidate = Some((base_def.did, field_ty));
+                        private_candidate = Some((adjustments, base_def.did, field_ty));
                     }
                 }
                 ty::Tuple(tys) => {
@@ -1729,7 +1729,10 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
         }
         self.structurally_resolved_type(autoderef.span(), autoderef.final_ty(false));
 
-        if let Some((did, field_ty)) = private_candidate {
+        if let Some((adjustments, did, field_ty)) = private_candidate {
+            // (#90483) apply adjustments to avoid ExprUseVisitor from
+            // creating erroneous projection.
+            self.apply_adjustments(base, adjustments);
             self.ban_private_field_access(expr, expr_t, field, did);
             return field_ty;
         }

compiler/rustc_typeck/src/check/fn_ctxt/suggestions.rs

@@ -420,7 +420,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                             ..
                         },
                         method,
-                    )) if Some(recv_ty.def_id()) == pin_did && method.ident.name == sym::new => {
+                    )) if recv_ty.opt_def_id() == pin_did && method.ident.name == sym::new => {
                         err.span_suggestion(
                             fn_name.span,
                             "use `Box::pin` to pin and box this expression",