Rollup of 5 pull requests

compiler/rustc_data_structures/src/sync.rs

@@ -21,11 +21,6 @@
 //! | `Lock<T>`               | `RefCell<T>`        | `RefCell<T>` or                 |
 //! |                         |                     | `parking_lot::Mutex<T>`         |
 //! | `RwLock<T>`             | `RefCell<T>`        | `parking_lot::RwLock<T>`        |
-//! | `MTLock<T>`        [^1] | `T`                 | `Lock<T>`                       |
-//!
-//! [^1]: `MTLock` is similar to `Lock`, but the serial version avoids the cost
-//! of a `RefCell`. This is appropriate when interior mutability is not
-//! required.
 
 use std::collections::HashMap;
 use std::hash::{BuildHasher, Hash};
@@ -106,38 +101,6 @@ mod mode {
     }
 }
 
-// FIXME(parallel_compiler): Get rid of these aliases across the compiler.
-
-#[derive(Debug, Default)]
-pub struct MTLock<T>(Lock<T>);
-
-impl<T> MTLock<T> {
-    #[inline(always)]
-    pub fn new(inner: T) -> Self {
-        MTLock(Lock::new(inner))
-    }
-
-    #[inline(always)]
-    pub fn into_inner(self) -> T {
-        self.0.into_inner()
-    }
-
-    #[inline(always)]
-    pub fn get_mut(&mut self) -> &mut T {
-        self.0.get_mut()
-    }
-
-    #[inline(always)]
-    pub fn lock(&self) -> LockGuard<'_, T> {
-        self.0.lock()
-    }
-
-    #[inline(always)]
-    pub fn lock_mut(&self) -> LockGuard<'_, T> {
-        self.lock()
-    }
-}
-
 /// This makes locks panic if they are already held.
 /// It is only useful when you are running in a single thread
 const ERROR_CHECKING: bool = false;

compiler/rustc_monomorphize/src/collector.rs

@@ -209,7 +209,7 @@ use std::cell::OnceCell;
 use std::ops::ControlFlow;
 
 use rustc_data_structures::fx::FxIndexMap;
-use rustc_data_structures::sync::{MTLock, par_for_each_in};
+use rustc_data_structures::sync::{Lock, par_for_each_in};
 use rustc_data_structures::unord::{UnordMap, UnordSet};
 use rustc_hir as hir;
 use rustc_hir::attrs::InlineAttr;
@@ -251,12 +251,12 @@ pub(crate) enum MonoItemCollectionStrategy {
 /// The state that is shared across the concurrent threads that are doing collection.
 struct SharedState<'tcx> {
     /// Items that have been or are currently being recursively collected.
-    visited: MTLock<UnordSet<MonoItem<'tcx>>>,
+    visited: Lock<UnordSet<MonoItem<'tcx>>>,
     /// Items that have been or are currently being recursively treated as "mentioned", i.e., their
     /// consts are evaluated but nothing is added to the collection.
-    mentioned: MTLock<UnordSet<MonoItem<'tcx>>>,
+    mentioned: Lock<UnordSet<MonoItem<'tcx>>>,
     /// Which items are being used where, for better errors.
-    usage_map: MTLock<UsageMap<'tcx>>,
+    usage_map: Lock<UsageMap<'tcx>>,
 }
 
 pub(crate) struct UsageMap<'tcx> {
@@ -359,7 +359,7 @@ fn collect_items_root<'tcx>(
     state: &SharedState<'tcx>,
     recursion_limit: Limit,
 ) {
-    if !state.visited.lock_mut().insert(starting_item.node) {
+    if !state.visited.lock().insert(starting_item.node) {
         // We've been here already, no need to search again.
         return;
     }
@@ -568,21 +568,21 @@ fn collect_items_rec<'tcx>(
     // This is part of the output of collection and hence only relevant for "used" items.
     // ("Mentioned" items are only considered internally during collection.)
     if mode == CollectionMode::UsedItems {
-        state.usage_map.lock_mut().record_used(starting_item.node, &used_items);
+        state.usage_map.lock().record_used(starting_item.node, &used_items);
     }
 
     {
         let mut visited = OnceCell::default();
         if mode == CollectionMode::UsedItems {
             used_items
                 .items
-                .retain(|k, _| visited.get_mut_or_init(|| state.visited.lock_mut()).insert(*k));
+                .retain(|k, _| visited.get_mut_or_init(|| state.visited.lock()).insert(*k));
         }
 
         let mut mentioned = OnceCell::default();
         mentioned_items.items.retain(|k, _| {
             !visited.get_or_init(|| state.visited.lock()).contains(k)
-                && mentioned.get_mut_or_init(|| state.mentioned.lock_mut()).insert(*k)
+                && mentioned.get_mut_or_init(|| state.mentioned.lock()).insert(*k)
         });
     }
     if mode == CollectionMode::MentionedItems {
@@ -1810,9 +1810,9 @@ pub(crate) fn collect_crate_mono_items<'tcx>(
     debug!("building mono item graph, beginning at roots");
 
     let state = SharedState {
-        visited: MTLock::new(UnordSet::default()),
-        mentioned: MTLock::new(UnordSet::default()),
-        usage_map: MTLock::new(UsageMap::new()),
+        visited: Lock::new(UnordSet::default()),
+        mentioned: Lock::new(UnordSet::default()),
+        usage_map: Lock::new(UsageMap::new()),
     };
     let recursion_limit = tcx.recursion_limit();
 

compiler/rustc_target/src/callconv/hexagon.rs

@@ -1,36 +1,76 @@
-use rustc_abi::TyAbiInterface;
+use rustc_abi::{HasDataLayout, TyAbiInterface};
 
-use crate::callconv::{ArgAbi, FnAbi};
+use crate::callconv::{ArgAbi, FnAbi, Reg, Uniform};
 
-fn classify_ret<Ty>(ret: &mut ArgAbi<'_, Ty>) {
-    if ret.layout.is_aggregate() && ret.layout.size.bits() > 64 {
-        ret.make_indirect();
-    } else {
+fn classify_ret<'a, Ty, C>(_cx: &C, ret: &mut ArgAbi<'a, Ty>)
+where
+    Ty: TyAbiInterface<'a, C> + Copy,
+    C: HasDataLayout,
+{
+    if !ret.layout.is_sized() {
+        return;
+    }
+
+    if !ret.layout.is_aggregate() {
         ret.extend_integer_width_to(32);
+        return;
+    }
+
+    // Per the Hexagon ABI:
+    // - Aggregates up to 32 bits are returned in R0
+    // - Aggregates 33-64 bits are returned in R1:R0
+    // - Aggregates > 64 bits are returned indirectly via hidden first argument
+    let size = ret.layout.size;
+    let bits = size.bits();
+    if bits <= 32 {
+        ret.cast_to(Uniform::new(Reg::i32(), size));
+    } else if bits <= 64 {
+        ret.cast_to(Uniform::new(Reg::i64(), size));
+    } else {
+        ret.make_indirect();
     }
 }
 
 fn classify_arg<'a, Ty, C>(cx: &C, arg: &mut ArgAbi<'a, Ty>)
 where
     Ty: TyAbiInterface<'a, C> + Copy,
+    C: HasDataLayout,
 {
+    if !arg.layout.is_sized() {
+        return;
+    }
     if arg.layout.pass_indirectly_in_non_rustic_abis(cx) {
         arg.make_indirect();
         return;
     }
-    if arg.layout.is_aggregate() && arg.layout.size.bits() > 64 {
-        arg.make_indirect();
-    } else {
+
+    if !arg.layout.is_aggregate() {
         arg.extend_integer_width_to(32);
+        return;
+    }
+
+    // Per the Hexagon ABI:
+    // - Aggregates up to 32 bits are passed in a single register
+    // - Aggregates 33-64 bits are passed in a register pair
+    // - Aggregates > 64 bits are passed on the stack
+    let size = arg.layout.size;
+    let bits = size.bits();
+    if bits <= 32 {
+        arg.cast_to(Uniform::new(Reg::i32(), size));
+    } else if bits <= 64 {
+        arg.cast_to(Uniform::new(Reg::i64(), size));
+    } else {
+        arg.pass_by_stack_offset(None);
     }
 }
 
 pub(crate) fn compute_abi_info<'a, Ty, C>(cx: &C, fn_abi: &mut FnAbi<'a, Ty>)
 where
     Ty: TyAbiInterface<'a, C> + Copy,
+    C: HasDataLayout,
 {
     if !fn_abi.ret.is_ignore() {
-        classify_ret(&mut fn_abi.ret);
+        classify_ret(cx, &mut fn_abi.ret);
     }
 
     for arg in fn_abi.args.iter_mut() {

compiler/rustc_trait_selection/src/error_reporting/infer/need_type_info.rs

@@ -1030,12 +1030,15 @@ impl<'a, 'tcx> FindInferSourceVisitor<'a, 'tcx> {
                         let args = self.node_args_opt(expr.hir_id)?;
                         let span = tcx.hir_span(segment.hir_id);
                         let insert_span = segment.ident.span.shrink_to_hi().with_hi(span.hi());
+                        let have_turbofish = segment.args.is_some_and(|args| {
+                            args.args.iter().any(|arg| arg.is_ty_or_const())
+                        });
                         InsertableGenericArgs {
                             insert_span,
                             args,
                             generics_def_id: def_id,
                             def_id,
-                            have_turbofish: false,
+                            have_turbofish,
                         }
                     };
                     return Box::new(insertable.into_iter());

compiler/rustc_trait_selection/src/error_reporting/traits/suggestions.rs

@@ -864,23 +864,63 @@ impl<'a, 'tcx> TypeErrCtxt<'a, 'tcx> {
             .collect::<Vec<_>>()
             .join(", ");
 
-        if matches!(obligation.cause.code(), ObligationCauseCode::FunctionArg { .. })
+        if let ObligationCauseCode::FunctionArg { arg_hir_id, .. } = obligation.cause.code()
             && obligation.cause.span.can_be_used_for_suggestions()
         {
-            let (span, sugg) = if let Some(snippet) =
-                self.tcx.sess.source_map().span_to_snippet(obligation.cause.span).ok()
-                && snippet.starts_with("|")
-            {
-                (obligation.cause.span, format!("({snippet})({args})"))
-            } else {
-                (obligation.cause.span.shrink_to_hi(), format!("({args})"))
+            let span = obligation.cause.span;
+
+            let arg_expr = match self.tcx.hir_node(*arg_hir_id) {
+                hir::Node::Expr(expr) => Some(expr),
+                _ => None,
             };
 
-            // When the obligation error has been ensured to have been caused by
-            // an argument, the `obligation.cause.span` points at the expression
-            // of the argument, so we can provide a suggestion. Otherwise, we give
-            // a more general note.
-            err.span_suggestion_verbose(span, msg, sugg, Applicability::HasPlaceholders);
+            let is_closure_expr =
+                arg_expr.is_some_and(|expr| matches!(expr.kind, hir::ExprKind::Closure(..)));
+
+            // If the user wrote `|| {}()`, suggesting to call the closure would produce `(|| {}())()`,
+            // which doesn't help and is often outright wrong.
+            if args.is_empty()
+                && let Some(expr) = arg_expr
+                && let hir::ExprKind::Closure(closure) = expr.kind
+            {
+                let mut body = self.tcx.hir_body(closure.body).value;
+
+                // Async closures desugar to a closure returning a coroutine
+                if let hir::ClosureKind::CoroutineClosure(hir::CoroutineDesugaring::Async) =
+                    closure.kind
+                {
+                    let peeled = body.peel_blocks().peel_drop_temps();
+                    if let hir::ExprKind::Closure(inner) = peeled.kind {
+                        body = self.tcx.hir_body(inner.body).value;
+                    }
+                }
+
+                let peeled_body = body.peel_blocks().peel_drop_temps();
+                if let hir::ExprKind::Call(callee, call_args) = peeled_body.kind
+                    && call_args.is_empty()
+                    && let hir::ExprKind::Block(..) = callee.peel_blocks().peel_drop_temps().kind
+                {
+                    return false;
+                }
+            }
+
+            if is_closure_expr {
+                err.multipart_suggestion_verbose(
+                    msg,
+                    vec![
+                        (span.shrink_to_lo(), "(".to_string()),
+                        (span.shrink_to_hi(), format!(")({args})")),
+                    ],
+                    Applicability::HasPlaceholders,
+                );
+            } else {
+                err.span_suggestion_verbose(
+                    span.shrink_to_hi(),
+                    msg,
+                    format!("({args})"),
+                    Applicability::HasPlaceholders,
+                );
+            }
         } else if let DefIdOrName::DefId(def_id) = def_id_or_name {
             let name = match self.tcx.hir_get_if_local(def_id) {
                 Some(hir::Node::Expr(hir::Expr {

src/bootstrap/src/core/config/flags.rs

@@ -570,16 +570,21 @@ impl Subcommand {
 
     pub fn test_target(&self) -> TestTarget {
         match *self {
-            Subcommand::Test { all_targets, doc, tests, .. }
-            | Subcommand::Miri { all_targets, doc, tests, .. } => match (all_targets, doc, tests) {
-                (true, true, _) | (true, _, true) | (_, true, true) => {
-                    panic!("You can only set one of `--all-targets`, `--doc` and `--tests`.")
+            Subcommand::Test { mut all_targets, doc, tests, no_doc, .. }
+            | Subcommand::Miri { mut all_targets, doc, tests, no_doc, .. } => {
+                // for backwards compatibility --no-doc keeps working
+                all_targets = all_targets || no_doc;
+
+                match (all_targets, doc, tests) {
+                    (true, true, _) | (true, _, true) | (_, true, true) => {
+                        panic!("You can only set one of `--all-targets`, `--doc` and `--tests`.")
+                    }
+                    (true, false, false) => TestTarget::AllTargets,
+                    (false, true, false) => TestTarget::DocOnly,
+                    (false, false, true) => TestTarget::Tests,
+                    (false, false, false) => TestTarget::Default,
                 }
-                (true, false, false) => TestTarget::AllTargets,
-                (false, true, false) => TestTarget::DocOnly,
-                (false, false, true) => TestTarget::Tests,
-                (false, false, false) => TestTarget::Default,
-            },
+            }
             _ => TestTarget::Default,
         }
     }

src/doc/rustc-dev-guide/src/parallel-rustc.md

@@ -48,7 +48,6 @@ are implemented differently depending on whether `parallel-compiler` is true.
 | -------------------------------- | --------------------------------------------------- | ------------ |
 | Lock\<T> | (parking_lot::Mutex\<T>) | (std::cell::RefCell) |
 | RwLock\<T> | (parking_lot::RwLock\<T>) | (std::cell::RefCell) |
-| MTLock\<T> | (Lock\<T>) | (T) |
 | ReadGuard | parking_lot::RwLockReadGuard | std::cell::Ref |
 | MappedReadGuard | parking_lot::MappedRwLockReadGuard | std::cell::Ref |
 | WriteGuard | parking_lot::RwLockWriteGuard | std::cell::RefMut |

tests/ui/const-generics/adt_const_params/const_param_ty_bad.stderr

@@ -32,9 +32,8 @@ LL | fn check(_: impl std::marker::ConstParamTy_) {}
    |                  ^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `check`
 help: use parentheses to call this closure
    |
-LL -     check(|| {});
-LL +     check((|| {})());
-   |
+LL |     check((|| {})());
+   |           +     +++
 
 error[E0277]: `fn()` can't be used as a const parameter type
   --> $DIR/const_param_ty_bad.rs:9:11

tests/ui/inference/useless-turbofish-suggestion.rs

@@ -0,0 +1,28 @@
+// Regression test for #153732.
+//
+// When a method call already has turbofish type arguments, don't suggest
+// rewriting them — the suggestion just rewrites user syntax into
+// fully-qualified form without resolving anything.
+//
+// The span still points at the method name rather than the unresolved `_`;
+// fixing that is left as future work.
+
+struct S;
+
+impl S {
+    fn f<A, B>(self, _a: A) -> B {
+        todo!()
+    }
+}
+
+fn with_turbofish() {
+    S.f::<u32, _>(42);
+    //~^ ERROR type annotations needed
+}
+
+fn without_turbofish() {
+    S.f(42);
+    //~^ ERROR type annotations needed
+}
+
+fn main() {}