Auto merge of rust-lang#119421 - matthiaskrgr:rollup-dbera1b, r=matth…

…iaskrgr

Rollup of 5 pull requests

Successful merges:

 - rust-lang#119322 (Couple of random coroutine pass simplifications)
 - rust-lang#119374 (Italicise "bytes" in the docs of some `Vec` methods)
 - rust-lang#119388 (rustc_lint: Prevent triplication of various lints)
 - rust-lang#119406 (Add non-regression test for ATPIT ICE rust-lang#114325)
 - rust-lang#119410 (Rename test to be more descriptive)

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

compiler/rustc_error_codes/src/error_codes/E0453.md

@@ -8,8 +8,8 @@ Example of erroneous code:
 
 #[allow(non_snake_case)]
 fn main() {
-    let MyNumber = 2; // error: allow(non_snake_case) overruled by outer
-                      //        forbid(non_snake_case)
+    // error: allow(non_snake_case) incompatible with previous forbid
+    let MyNumber = 2;
 }
 ```
 

compiler/rustc_lint/src/context.rs

@@ -1069,7 +1069,7 @@ impl<'a> EarlyContext<'a> {
     pub(crate) fn new(
         sess: &'a Session,
         features: &'a Features,
-        warn_about_weird_lints: bool,
+        lint_added_lints: bool,
         lint_store: &'a LintStore,
         registered_tools: &'a RegisteredTools,
         buffered: LintBuffer,
@@ -1078,7 +1078,7 @@ impl<'a> EarlyContext<'a> {
             builder: LintLevelsBuilder::new(
                 sess,
                 features,
-                warn_about_weird_lints,
+                lint_added_lints,
                 lint_store,
                 registered_tools,
             ),

compiler/rustc_lint/src/levels.rs

@@ -135,7 +135,7 @@ fn lint_expectations(tcx: TyCtxt<'_>, (): ()) -> Vec<(LintExpectationId, LintExp
             unstable_to_stable_ids: FxHashMap::default(),
             empty: FxHashMap::default(),
         },
-        warn_about_weird_lints: false,
+        lint_added_lints: false,
         store,
         registered_tools: tcx.registered_tools(()),
     };
@@ -164,7 +164,7 @@ fn shallow_lint_levels_on(tcx: TyCtxt<'_>, owner: hir::OwnerId) -> ShallowLintLe
             empty: FxHashMap::default(),
             attrs,
         },
-        warn_about_weird_lints: false,
+        lint_added_lints: false,
         store,
         registered_tools: tcx.registered_tools(()),
     };
@@ -451,7 +451,7 @@ pub struct LintLevelsBuilder<'s, P> {
     sess: &'s Session,
     features: &'s Features,
     provider: P,
-    warn_about_weird_lints: bool,
+    lint_added_lints: bool,
     store: &'s LintStore,
     registered_tools: &'s RegisteredTools,
 }
@@ -464,15 +464,15 @@ impl<'s> LintLevelsBuilder<'s, TopDown> {
     pub(crate) fn new(
         sess: &'s Session,
         features: &'s Features,
-        warn_about_weird_lints: bool,
+        lint_added_lints: bool,
         store: &'s LintStore,
         registered_tools: &'s RegisteredTools,
     ) -> Self {
         let mut builder = LintLevelsBuilder {
             sess,
             features,
             provider: TopDown { sets: LintLevelSets::new(), cur: COMMAND_LINE },
-            warn_about_weird_lints,
+            lint_added_lints,
             store,
             registered_tools,
         };
@@ -642,7 +642,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
         //
         // This means that this only errors if we're truly lowering the lint
         // level from forbid.
-        if level != Level::Forbid {
+        if self.lint_added_lints && level != Level::Forbid {
             if let Level::Forbid = old_level {
                 // Backwards compatibility check:
                 //
@@ -968,7 +968,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
                         continue;
                     }
 
-                    _ if !self.warn_about_weird_lints => {}
+                    _ if !self.lint_added_lints => {}
 
                     CheckLintNameResult::Renamed(ref replace) => {
                         let suggestion =
@@ -1029,7 +1029,7 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
             }
         }
 
-        if !is_crate_node {
+        if self.lint_added_lints && !is_crate_node {
             for (id, &(level, ref src)) in self.current_specs().iter() {
                 if !id.lint.crate_level_only {
                     continue;
@@ -1054,33 +1054,33 @@ impl<'s, P: LintLevelsProvider> LintLevelsBuilder<'s, P> {
     /// Checks if the lint is gated on a feature that is not enabled.
     ///
     /// Returns `true` if the lint's feature is enabled.
-    // FIXME only emit this once for each attribute, instead of repeating it 4 times for
-    // pre-expansion lints, post-expansion lints, `shallow_lint_levels_on` and `lint_expectations`.
     #[track_caller]
     fn check_gated_lint(&self, lint_id: LintId, span: Span, lint_from_cli: bool) -> bool {
         if let Some(feature) = lint_id.lint.feature_gate {
             if !self.features.active(feature) {
-                let lint = builtin::UNKNOWN_LINTS;
-                let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
-                struct_lint_level(
-                    self.sess,
-                    lint,
-                    level,
-                    src,
-                    Some(span.into()),
-                    fluent::lint_unknown_gated_lint,
-                    |lint| {
-                        lint.set_arg("name", lint_id.lint.name_lower());
-                        lint.note(fluent::lint_note);
-                        rustc_session::parse::add_feature_diagnostics_for_issue(
-                            lint,
-                            &self.sess.parse_sess,
-                            feature,
-                            GateIssue::Language,
-                            lint_from_cli,
-                        );
-                    },
-                );
+                if self.lint_added_lints {
+                    let lint = builtin::UNKNOWN_LINTS;
+                    let (level, src) = self.lint_level(builtin::UNKNOWN_LINTS);
+                    struct_lint_level(
+                        self.sess,
+                        lint,
+                        level,
+                        src,
+                        Some(span.into()),
+                        fluent::lint_unknown_gated_lint,
+                        |lint| {
+                            lint.set_arg("name", lint_id.lint.name_lower());
+                            lint.note(fluent::lint_note);
+                            rustc_session::parse::add_feature_diagnostics_for_issue(
+                                lint,
+                                &self.sess.parse_sess,
+                                feature,
+                                GateIssue::Language,
+                                lint_from_cli,
+                            );
+                        },
+                    );
+                }
                 return false;
             }
         }

compiler/rustc_mir_transform/src/coroutine.rs

@@ -1417,20 +1417,18 @@ fn create_coroutine_resume_function<'tcx>(
     cases.insert(0, (UNRESUMED, START_BLOCK));
 
     // Panic when resumed on the returned or poisoned state
-    let coroutine_kind = body.coroutine_kind().unwrap();
-
     if can_unwind {
         cases.insert(
             1,
-            (POISONED, insert_panic_block(tcx, body, ResumedAfterPanic(coroutine_kind))),
+            (POISONED, insert_panic_block(tcx, body, ResumedAfterPanic(transform.coroutine_kind))),
         );
     }
 
     if can_return {
-        let block = match coroutine_kind {
+        let block = match transform.coroutine_kind {
             CoroutineKind::Desugared(CoroutineDesugaring::Async, _)
             | CoroutineKind::Coroutine(_) => {
-                insert_panic_block(tcx, body, ResumedAfterReturn(coroutine_kind))
+                insert_panic_block(tcx, body, ResumedAfterReturn(transform.coroutine_kind))
             }
             CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _)
             | CoroutineKind::Desugared(CoroutineDesugaring::Gen, _) => {
@@ -1444,7 +1442,7 @@ fn create_coroutine_resume_function<'tcx>(
 
     make_coroutine_state_argument_indirect(tcx, body);
 
-    match coroutine_kind {
+    match transform.coroutine_kind {
         // Iterator::next doesn't accept a pinned argument,
         // unlike for all other coroutine kinds.
         CoroutineKind::Desugared(CoroutineDesugaring::Gen, _) => {}
@@ -1614,12 +1612,6 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
             }
         };
 
-        let is_async_kind =
-            matches!(coroutine_kind, CoroutineKind::Desugared(CoroutineDesugaring::Async, _));
-        let is_async_gen_kind =
-            matches!(coroutine_kind, CoroutineKind::Desugared(CoroutineDesugaring::AsyncGen, _));
-        let is_gen_kind =
-            matches!(coroutine_kind, CoroutineKind::Desugared(CoroutineDesugaring::Gen, _));
         let new_ret_ty = match coroutine_kind {
             CoroutineKind::Desugared(CoroutineDesugaring::Async, _) => {
                 // Compute Poll<return_ty>
@@ -1653,7 +1645,10 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
         let old_ret_local = replace_local(RETURN_PLACE, new_ret_ty, body, tcx);
 
         // Replace all occurrences of `ResumeTy` with `&mut Context<'_>` within async bodies.
-        if is_async_kind || is_async_gen_kind {
+        if matches!(
+            coroutine_kind,
+            CoroutineKind::Desugared(CoroutineDesugaring::Async | CoroutineDesugaring::AsyncGen, _)
+        ) {
             transform_async_context(tcx, body);
         }
 
@@ -1662,11 +1657,7 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
         // case there is no `Assign` to it that the transform can turn into a store to the coroutine
         // state. After the yield the slot in the coroutine state would then be uninitialized.
         let resume_local = Local::new(2);
-        let resume_ty = if is_async_kind {
-            Ty::new_task_context(tcx)
-        } else {
-            body.local_decls[resume_local].ty
-        };
+        let resume_ty = body.local_decls[resume_local].ty;
         let old_resume_local = replace_local(resume_local, resume_ty, body, tcx);
 
         // When first entering the coroutine, move the resume argument into its old local
@@ -1709,11 +1700,11 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
         // Run the transformation which converts Places from Local to coroutine struct
         // accesses for locals in `remap`.
         // It also rewrites `return x` and `yield y` as writing a new coroutine state and returning
-        // either CoroutineState::Complete(x) and CoroutineState::Yielded(y),
-        // or Poll::Ready(x) and Poll::Pending respectively depending on `is_async_kind`.
+        // either `CoroutineState::Complete(x)` and `CoroutineState::Yielded(y)`,
+        // or `Poll::Ready(x)` and `Poll::Pending` respectively depending on the coroutine kind.
         let mut transform = TransformVisitor {
             tcx,
-            coroutine_kind: body.coroutine_kind().unwrap(),
+            coroutine_kind,
             remap,
             storage_liveness,
             always_live_locals,
@@ -1730,7 +1721,7 @@ impl<'tcx> MirPass<'tcx> for StateTransform {
         body.spread_arg = None;
 
         // Remove the context argument within generator bodies.
-        if is_gen_kind {
+        if matches!(coroutine_kind, CoroutineKind::Desugared(CoroutineDesugaring::Gen, _)) {
             transform_gen_context(tcx, body);
         }
 

library/alloc/src/raw_vec.rs

@@ -284,7 +284,7 @@ impl<T, A: Allocator> RawVec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Aborts
     ///
@@ -342,7 +342,7 @@ impl<T, A: Allocator> RawVec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Aborts
     ///

library/alloc/src/vec/mod.rs

@@ -445,7 +445,7 @@ impl<T> Vec<T> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///
@@ -633,7 +633,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///
@@ -896,7 +896,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///
@@ -926,7 +926,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///
@@ -1900,7 +1900,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///
@@ -2003,7 +2003,7 @@ impl<T, A: Allocator> Vec<T, A> {
     ///
     /// # Panics
     ///
-    /// Panics if the new capacity exceeds `isize::MAX` bytes.
+    /// Panics if the new capacity exceeds `isize::MAX` _bytes_.
     ///
     /// # Examples
     ///

tests/ui/error-codes/E0453.rs

@@ -2,6 +2,5 @@
 
 #[allow(non_snake_case)]
 //~^ ERROR allow(non_snake_case) incompatible
-//~| ERROR allow(non_snake_case) incompatible
 fn main() {
 }

tests/ui/error-codes/E0453.stderr

@@ -7,17 +7,6 @@ LL |
 LL | #[allow(non_snake_case)]
    |         ^^^^^^^^^^^^^^ overruled by previous forbid
 
-error[E0453]: allow(non_snake_case) incompatible with previous forbid
-  --> $DIR/E0453.rs:3:9
-   |
-LL | #![forbid(non_snake_case)]
-   |           -------------- `forbid` level set here
-LL |
-LL | #[allow(non_snake_case)]
-   |         ^^^^^^^^^^^^^^ overruled by previous forbid
-   |
-   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`
-
-error: aborting due to 2 previous errors
+error: aborting due to 1 previous error
 
 For more information about this error, try `rustc --explain E0453`.

tests/ui/feature-gates/feature-gate-multiple_supertrait_upcastable.rs

@@ -2,11 +2,7 @@
 
 #![deny(multiple_supertrait_upcastable)]
 //~^ WARNING unknown lint: `multiple_supertrait_upcastable`
-//~| WARNING unknown lint: `multiple_supertrait_upcastable`
-//~| WARNING unknown lint: `multiple_supertrait_upcastable`
 #![warn(multiple_supertrait_upcastable)]
 //~^ WARNING unknown lint: `multiple_supertrait_upcastable`
-//~| WARNING unknown lint: `multiple_supertrait_upcastable`
-//~| WARNING unknown lint: `multiple_supertrait_upcastable`
 
 fn main() {}