Merge #57

57: Pull upstream master 2023 10 18 r=pietroalbini a=Veykril

* rust-lang/rust#116505
* rust-lang/rust#116840
* rust-lang/rust#116767
* rust-lang/rust#116855
  * rust-lang/rust#116827
  * rust-lang/rust#116787
  * rust-lang/rust#116719
  * rust-lang/rust#116717
  * rust-lang/rust#111072
* rust-lang/rust#116844
* rust-lang/rust#115577
* rust-lang/rust#116756
* rust-lang/rust#116518



Co-authored-by: Urgau <urgau@numericable.fr>
Co-authored-by: Esteban Küber <esteban@kuber.com.ar>
Co-authored-by: Deadbeef <ent3rm4n@gmail.com>
Co-authored-by: Ralf Jung <post@ralfj.de>
Co-authored-by: Camille GILLOT <gillot.camille@gmail.com>
Co-authored-by: Celina G. Val <celinval@amazon.com>
Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com>
Co-authored-by: Arthur Lafrance <lafrancearthur@gmail.com>
Co-authored-by: Nikolay Arhipov <n@arhipov.net>
Co-authored-by: Nikita Popov <npopov@redhat.com>
Co-authored-by: bors <bors@rust-lang.org>

Cargo.lock

@@ -1119,6 +1119,7 @@ dependencies = [
  "glob",
  "hex",
  "home",
+ "indexmap 2.0.0",
  "lazycell",
  "libc",
  "miow",

compiler/rustc_driver_impl/src/lib.rs

@@ -1185,7 +1185,11 @@ fn print_flag_list<T>(
 ///
 /// So with all that in mind, the comments below have some more detail about the
 /// contortions done here to get things to work out correctly.
-fn handle_options(handler: &EarlyErrorHandler, args: &[String]) -> Option<getopts::Matches> {
+///
+/// This does not need to be `pub` for rustc itself, but @chaosite needs it to
+/// be public when using rustc as a library, see
+/// <https://github.com/rust-lang/rust/commit/2b4c33817a5aaecabf4c6598d41e190080ec119e>
+pub fn handle_options(handler: &EarlyErrorHandler, args: &[String]) -> Option<getopts::Matches> {
     if args.is_empty() {
         // user did not write `-v` nor `-Z unstable-options`, so do not
         // include that extra information.

compiler/rustc_hir_analysis/src/astconv/mod.rs

@@ -1091,7 +1091,8 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
             self.trait_defines_associated_item_named(r.def_id(), ty::AssocKind::Const, assoc_name)
         });
 
-        let (bound, next_cand) = match (matching_candidates.next(), const_candidates.next()) {
+        let (mut bound, mut next_cand) = match (matching_candidates.next(), const_candidates.next())
+        {
             (Some(bound), _) => (bound, matching_candidates.next()),
             (None, Some(bound)) => (bound, const_candidates.next()),
             (None, None) => {
@@ -1107,6 +1108,37 @@ impl<'o, 'tcx> dyn AstConv<'tcx> + 'o {
         };
         debug!(?bound);
 
+        // look for a candidate that is not the same as our first bound, disregarding
+        // whether the bound is const.
+        while let Some(mut bound2) = next_cand {
+            debug!(?bound2);
+            let tcx = self.tcx();
+            if bound2.bound_vars() != bound.bound_vars() {
+                break;
+            }
+
+            let generics = tcx.generics_of(bound.def_id());
+            let Some(host_index) = generics.host_effect_index else { break };
+
+            // always return the bound that contains the host param.
+            if let ty::ConstKind::Param(_) = bound2.skip_binder().args.const_at(host_index).kind() {
+                (bound, bound2) = (bound2, bound);
+            }
+
+            let unconsted_args = bound
+                .skip_binder()
+                .args
+                .iter()
+                .enumerate()
+                .map(|(n, arg)| if host_index == n { tcx.consts.true_.into() } else { arg });
+
+            if unconsted_args.eq(bound2.skip_binder().args.iter()) {
+                next_cand = matching_candidates.next().or_else(|| const_candidates.next());
+            } else {
+                break;
+            }
+        }
+
         if let Some(bound2) = next_cand {
             debug!(?bound2);
 

compiler/rustc_hir_analysis/src/bounds.rs

@@ -43,6 +43,33 @@ impl<'tcx> Bounds<'tcx> {
         trait_ref: ty::PolyTraitRef<'tcx>,
         span: Span,
         polarity: ty::ImplPolarity,
+    ) {
+        self.push_trait_bound_inner(tcx, trait_ref, span, polarity);
+
+        // if we have a host param, we push an unconst trait bound in addition
+        // to the const one.
+        // FIXME(effects) we should find a better way than name matching
+        if tcx.features().effects && trait_ref.skip_binder().args.host_effect_param().is_some() {
+            let generics = tcx.generics_of(trait_ref.def_id());
+            let Some(host_index) = generics.host_effect_index else { return };
+            let trait_ref = trait_ref.map_bound(|mut trait_ref| {
+                trait_ref.args =
+                    tcx.mk_args_from_iter(trait_ref.args.iter().enumerate().map(|(n, arg)| {
+                        if host_index == n { tcx.consts.true_.into() } else { arg }
+                    }));
+                trait_ref
+            });
+
+            self.push_trait_bound_inner(tcx, trait_ref, span, polarity);
+        }
+    }
+
+    fn push_trait_bound_inner(
+        &mut self,
+        tcx: TyCtxt<'tcx>,
+        trait_ref: ty::PolyTraitRef<'tcx>,
+        span: Span,
+        polarity: ty::ImplPolarity,
     ) {
         self.clauses.push((
             trait_ref

compiler/rustc_hir_analysis/src/collect/predicates_of.rs

@@ -11,7 +11,7 @@ use rustc_hir::intravisit::{self, Visitor};
 use rustc_middle::ty::{self, Ty, TyCtxt};
 use rustc_middle::ty::{GenericPredicates, ImplTraitInTraitData, ToPredicate};
 use rustc_span::symbol::Ident;
-use rustc_span::{Span, DUMMY_SP};
+use rustc_span::{sym, Span, DUMMY_SP};
 
 /// Returns a list of all type predicates (explicit and implicit) for the definition with
 /// ID `def_id`. This includes all predicates returned by `predicates_defined_on`, plus
@@ -38,11 +38,38 @@ pub(super) fn predicates_of(tcx: TyCtxt<'_>, def_id: DefId) -> ty::GenericPredic
         // an obligation and instead be skipped. Otherwise we'd use
         // `tcx.def_span(def_id);`
         let span = rustc_span::DUMMY_SP;
-        result.predicates =
-            tcx.arena.alloc_from_iter(result.predicates.iter().copied().chain(std::iter::once((
-                ty::TraitRef::identity(tcx, def_id).to_predicate(tcx),
+        let non_const_bound = if tcx.features().effects && tcx.has_attr(def_id, sym::const_trait) {
+            // when `Self` is a const trait, also add `Self: Trait<.., true>` as implied bound,
+            // because only implementing `Self: Trait<.., false>` is currently not possible.
+            Some((
+                ty::TraitRef::new(
+                    tcx,
+                    def_id,
+                    ty::GenericArgs::for_item(tcx, def_id, |param, _| {
+                        if param.is_host_effect() {
+                            tcx.consts.true_.into()
+                        } else {
+                            tcx.mk_param_from_def(param)
+                        }
+                    }),
+                )
+                .to_predicate(tcx),
                 span,
-            ))));
+            ))
+        } else {
+            None
+        };
+        result.predicates = tcx.arena.alloc_from_iter(
+            result
+                .predicates
+                .iter()
+                .copied()
+                .chain(std::iter::once((
+                    ty::TraitRef::identity(tcx, def_id).to_predicate(tcx),
+                    span,
+                )))
+                .chain(non_const_bound),
+        );
     }
     debug!("predicates_of(def_id={:?}) = {:?}", def_id, result);
     result

compiler/rustc_hir_typeck/src/callee.rs

@@ -650,7 +650,7 @@ impl<'a, 'tcx> FnCtxt<'a, 'tcx> {
                 .sess
                 .source_map()
                 .is_multiline(call_expr.span.with_lo(callee_expr.span.hi()))
-                && call_expr.span.ctxt() == callee_expr.span.ctxt();
+                && call_expr.span.eq_ctxt(callee_expr.span);
             if call_is_multiline {
                 err.span_suggestion(
                     callee_expr.span.shrink_to_hi(),

compiler/rustc_hir_typeck/src/fn_ctxt/mod.rs

@@ -221,14 +221,14 @@ impl<'a, 'tcx> AstConv<'tcx> for FnCtxt<'a, 'tcx> {
         let item_def_id = tcx.hir().ty_param_owner(def_id);
         let generics = tcx.generics_of(item_def_id);
         let index = generics.param_def_id_to_index[&def_id.to_def_id()];
+        // HACK(eddyb) should get the original `Span`.
+        let span = tcx.def_span(def_id);
         ty::GenericPredicates {
             parent: None,
             predicates: tcx.arena.alloc_from_iter(
                 self.param_env.caller_bounds().iter().filter_map(|predicate| {
                     match predicate.kind().skip_binder() {
                         ty::ClauseKind::Trait(data) if data.self_ty().is_param(index) => {
-                            // HACK(eddyb) should get the original `Span`.
-                            let span = tcx.def_span(def_id);
                             Some((predicate, span))
                         }
                         _ => None,

compiler/rustc_interface/src/interface.rs

@@ -125,8 +125,13 @@ pub fn parse_cfgspecs(
 /// Converts strings provided as `--check-cfg [specs]` into a `CheckCfg`.
 pub fn parse_check_cfg(handler: &EarlyErrorHandler, specs: Vec<String>) -> CheckCfg {
     rustc_span::create_default_session_if_not_set_then(move |_| {
-        let mut check_cfg = CheckCfg::default();
+        // If any --check-cfg is passed then exhaustive_values and exhaustive_names
+        // are enabled by default.
+        let exhaustive_names = !specs.is_empty();
+        let exhaustive_values = !specs.is_empty();
+        let mut check_cfg = CheckCfg { exhaustive_names, exhaustive_values, ..CheckCfg::default() };
 
+        let mut old_syntax = None;
         for s in specs {
             let sess = ParseSess::with_silent_emitter(Some(format!(
                 "this error occurred on the command line: `--check-cfg={s}`"
@@ -142,18 +147,21 @@ pub fn parse_check_cfg(handler: &EarlyErrorHandler, specs: Vec<String>) -> Check
                 };
             }
 
-            let expected_error = || {
-                error!(
-                    "expected `names(name1, name2, ... nameN)` or \
-                        `values(name, \"value1\", \"value2\", ... \"valueN\")`"
-                )
-            };
+            let expected_error =
+                || error!("expected `cfg(name, values(\"value1\", \"value2\", ... \"valueN\"))`");
 
             match maybe_new_parser_from_source_str(&sess, filename, s.to_string()) {
                 Ok(mut parser) => match parser.parse_meta_item() {
                     Ok(meta_item) if parser.token == token::Eof => {
                         if let Some(args) = meta_item.meta_item_list() {
                             if meta_item.has_name(sym::names) {
+                                // defaults are flipped for the old syntax
+                                if old_syntax == None {
+                                    check_cfg.exhaustive_names = false;
+                                    check_cfg.exhaustive_values = false;
+                                }
+                                old_syntax = Some(true);
+
                                 check_cfg.exhaustive_names = true;
                                 for arg in args {
                                     if arg.is_word() && arg.ident().is_some() {
@@ -167,6 +175,13 @@ pub fn parse_check_cfg(handler: &EarlyErrorHandler, specs: Vec<String>) -> Check
                                     }
                                 }
                             } else if meta_item.has_name(sym::values) {
+                                // defaults are flipped for the old syntax
+                                if old_syntax == None {
+                                    check_cfg.exhaustive_names = false;
+                                    check_cfg.exhaustive_values = false;
+                                }
+                                old_syntax = Some(true);
+
                                 if let Some((name, values)) = args.split_first() {
                                     if name.is_word() && name.ident().is_some() {
                                         let ident = name.ident().expect("multi-segment cfg key");
@@ -216,6 +231,116 @@ pub fn parse_check_cfg(handler: &EarlyErrorHandler, specs: Vec<String>) -> Check
                                 } else {
                                     expected_error();
                                 }
+                            } else if meta_item.has_name(sym::cfg) {
+                                old_syntax = Some(false);
+
+                                let mut names = Vec::new();
+                                let mut values: FxHashSet<_> = Default::default();
+
+                                let mut any_specified = false;
+                                let mut values_specified = false;
+                                let mut values_any_specified = false;
+
+                                for arg in args {
+                                    if arg.is_word() && let Some(ident) = arg.ident() {
+                                        if values_specified {
+                                            error!("`cfg()` names cannot be after values");
+                                        }
+                                        names.push(ident);
+                                    } else if arg.has_name(sym::any)
+                                        && let Some(args) = arg.meta_item_list()
+                                    {
+                                        if any_specified {
+                                            error!("`any()` cannot be specified multiple times");
+                                        }
+                                        any_specified = true;
+                                        if !args.is_empty() {
+                                            error!("`any()` must be empty");
+                                        }
+                                    } else if arg.has_name(sym::values)
+                                        && let Some(args) = arg.meta_item_list()
+                                    {
+                                        if names.is_empty() {
+                                            error!(
+                                                "`values()` cannot be specified before the names"
+                                            );
+                                        } else if values_specified {
+                                            error!(
+                                                "`values()` cannot be specified multiple times"
+                                            );
+                                        }
+                                        values_specified = true;
+
+                                        for arg in args {
+                                            if let Some(LitKind::Str(s, _)) =
+                                                arg.lit().map(|lit| &lit.kind)
+                                            {
+                                                values.insert(Some(s.to_string()));
+                                            } else if arg.has_name(sym::any)
+                                                && let Some(args) = arg.meta_item_list()
+                                            {
+                                                if values_any_specified {
+                                                    error!(
+                                                        "`any()` in `values()` cannot be specified multiple times"
+                                                    );
+                                                }
+                                                values_any_specified = true;
+                                                if !args.is_empty() {
+                                                    error!("`any()` must be empty");
+                                                }
+                                            } else {
+                                                error!(
+                                                    "`values()` arguments must be string literals or `any()`"
+                                                );
+                                            }
+                                        }
+                                    } else {
+                                        error!(
+                                            "`cfg()` arguments must be simple identifiers, `any()` or `values(...)`"
+                                        );
+                                    }
+                                }
+
+                                if values.is_empty() && !values_any_specified && !any_specified {
+                                    values.insert(None);
+                                } else if !values.is_empty() && values_any_specified {
+                                    error!(
+                                        "`values()` arguments cannot specify string literals and `any()` at the same time"
+                                    );
+                                }
+
+                                if any_specified {
+                                    if !names.is_empty()
+                                        || !values.is_empty()
+                                        || values_any_specified
+                                    {
+                                        error!("`cfg(any())` can only be provided in isolation");
+                                    }
+
+                                    check_cfg.exhaustive_names = false;
+                                } else {
+                                    for name in names {
+                                        check_cfg
+                                            .expecteds
+                                            .entry(name.to_string())
+                                            .and_modify(|v| match v {
+                                                ExpectedValues::Some(v)
+                                                    if !values_any_specified =>
+                                                {
+                                                    v.extend(values.clone())
+                                                }
+                                                ExpectedValues::Some(_) => *v = ExpectedValues::Any,
+                                                ExpectedValues::Any => {}
+                                            })
+                                            .or_insert_with(|| {
+                                                if values_any_specified {
+                                                    ExpectedValues::Any
+                                                } else {
+                                                    ExpectedValues::Some(values.clone())
+                                                }
+                                            });
+                                    }
+                                }
                             } else {
                                 expected_error();
                             }

compiler/rustc_interface/src/lib.rs

@@ -3,6 +3,7 @@
 #![feature(internal_output_capture)]
 #![feature(thread_spawn_unchecked)]
 #![feature(lazy_cell)]
+#![feature(let_chains)]
 #![feature(try_blocks)]
 #![recursion_limit = "256"]
 #![allow(rustc::potential_query_instability)]

compiler/rustc_interface/src/tests.rs

@@ -779,6 +779,7 @@ fn test_unstable_options_tracking_hash() {
     );
     tracked!(codegen_backend, Some("abc".to_string()));
     tracked!(crate_attr, vec!["abc".to_string()]);
+    tracked!(cross_crate_inline_threshold, Some(200));
     tracked!(debug_info_for_profiling, true);
     tracked!(debug_macros, true);
     tracked!(dep_info_omit_d_target, true);

compiler/rustc_lint/messages.ftl

@@ -494,6 +494,8 @@ lint_renamed_lint = lint `{$name}` has been renamed to `{$replace}`
 
 lint_requested_level = requested on the command line with `{$level} {$lint_name}`
 
+lint_span_use_eq_ctxt = use `.eq_ctxt()` instead of `.ctxt() == .ctxt()`
+
 lint_supertrait_as_deref_target = `{$t}` implements `Deref` with supertrait `{$target_principal}` as target
     .label = target type is set here