Rollup of 10 pull requests

compiler/rustc_driver_impl/src/lib.rs

@@ -1250,7 +1250,8 @@ pub fn install_ice_hook(bug_report_url: &'static str, extra_info: fn(&Handler))
         #[cfg(windows)]
         if let Some(msg) = info.payload().downcast_ref::<String>() {
             if msg.starts_with("failed printing to stdout: ") && msg.ends_with("(os error 232)") {
-                early_error_no_abort(ErrorOutputType::default(), msg.as_str());
+                // the error code is already going to be reported when the panic unwinds up the stack
+                let _ = early_error_no_abort(ErrorOutputType::default(), msg.as_str());
                 return;
             }
         };

compiler/rustc_errors/src/lib.rs

@@ -1740,7 +1740,7 @@ impl DelayedDiagnostic {
     }
 
     fn decorate(mut self) -> Diagnostic {
-        self.inner.note(format!("delayed at {}", self.note));
+        self.inner.note(format!("delayed at {}\n{}", self.inner.emitted_at, self.note));
         self.inner
     }
 }

compiler/rustc_infer/src/infer/opaque_types.rs

@@ -530,19 +530,18 @@ impl<'tcx> InferCtxt<'tcx> {
         // these are the same span, but not in cases like `-> (impl
         // Foo, impl Bar)`.
         let span = cause.span;
-
-        let mut obligations = vec![];
         let prev = self.inner.borrow_mut().opaque_types().register(
             OpaqueTypeKey { def_id, substs },
             OpaqueHiddenType { ty: hidden_ty, span },
             origin,
         );
-        if let Some(prev) = prev {
-            obligations = self
-                .at(&cause, param_env)
+        let mut obligations = if let Some(prev) = prev {
+            self.at(&cause, param_env)
                 .eq_exp(DefineOpaqueTypes::Yes, a_is_expected, prev, hidden_ty)?
-                .obligations;
-        }
+                .obligations
+        } else {
+            Vec::new()
+        };
 
         let item_bounds = tcx.explicit_item_bounds(def_id);
 

compiler/rustc_lint/src/unused.rs

@@ -103,8 +103,10 @@ impl<'tcx> LateLintPass<'tcx> for UnusedResults {
             && let ty = cx.typeck_results().expr_ty(&await_expr)
             && let ty::Alias(ty::Opaque, ty::AliasTy { def_id: future_def_id, .. }) = ty.kind()
             && cx.tcx.ty_is_opaque_future(ty)
-            // FIXME: This also includes non-async fns that return `impl Future`.
             && let async_fn_def_id = cx.tcx.parent(*future_def_id)
+            && matches!(cx.tcx.def_kind(async_fn_def_id), DefKind::Fn | DefKind::AssocFn)
+            // Check that this `impl Future` actually comes from an `async fn`
+            && cx.tcx.asyncness(async_fn_def_id).is_async()
             && check_must_use_def(
                 cx,
                 async_fn_def_id,

compiler/rustc_middle/src/mir/mod.rs

@@ -101,7 +101,7 @@ impl<'tcx> HasLocalDecls<'tcx> for Body<'tcx> {
 /// pass will be named after the type, and it will consist of a main
 /// loop that goes over each available MIR and applies `run_pass`.
 pub trait MirPass<'tcx> {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         let name = std::any::type_name::<Self>();
         if let Some((_, tail)) = name.rsplit_once(':') { tail } else { name }
     }

compiler/rustc_mir_transform/src/dump_mir.rs

@@ -12,7 +12,7 @@ use rustc_session::config::OutputType;
 pub struct Marker(pub &'static str);
 
 impl<'tcx> MirPass<'tcx> for Marker {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         self.0
     }
 

compiler/rustc_mir_transform/src/pass_manager.rs

@@ -6,7 +6,7 @@ use crate::{validate, MirPass};
 
 /// Just like `MirPass`, except it cannot mutate `Body`.
 pub trait MirLint<'tcx> {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         let name = std::any::type_name::<Self>();
         if let Some((_, tail)) = name.rsplit_once(':') { tail } else { name }
     }
@@ -26,7 +26,7 @@ impl<'tcx, T> MirPass<'tcx> for Lint<T>
 where
     T: MirLint<'tcx>,
 {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         self.0.name()
     }
 
@@ -49,7 +49,7 @@ impl<'tcx, T> MirPass<'tcx> for WithMinOptLevel<T>
 where
     T: MirPass<'tcx>,
 {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         self.1.name()
     }
 
@@ -121,7 +121,7 @@ fn run_passes_inner<'tcx>(
                 validate_body(tcx, body, format!("before pass {}", name));
             }
 
-            pass.run_pass(tcx, body);
+            tcx.sess.time(name, || pass.run_pass(tcx, body));
 
             if dump_enabled {
                 dump_mir_for_pass(tcx, body, &name, true);

compiler/rustc_mir_transform/src/simplify.rs

@@ -74,7 +74,7 @@ pub fn simplify_cfg<'tcx>(tcx: TyCtxt<'tcx>, body: &mut Body<'tcx>) {
 }
 
 impl<'tcx> MirPass<'tcx> for SimplifyCfg {
-    fn name(&self) -> &str {
+    fn name(&self) -> &'static str {
         &self.name()
     }
 

compiler/rustc_monomorphize/src/partitioning/mod.rs

@@ -250,13 +250,13 @@ where
         cgu.create_size_estimate(tcx);
     }
 
-    debug_dump(tcx, "INITIAL PARTITIONING:", initial_partitioning.codegen_units.iter());
+    debug_dump(tcx, "INITIAL PARTITIONING", &initial_partitioning.codegen_units);
 
     // Merge until we have at most `max_cgu_count` codegen units.
     {
         let _prof_timer = tcx.prof.generic_activity("cgu_partitioning_merge_cgus");
         partitioner.merge_codegen_units(cx, &mut initial_partitioning);
-        debug_dump(tcx, "POST MERGING:", initial_partitioning.codegen_units.iter());
+        debug_dump(tcx, "POST MERGING", &initial_partitioning.codegen_units);
     }
 
     // In the next step, we use the inlining map to determine which additional
@@ -272,7 +272,7 @@ where
         cgu.create_size_estimate(tcx);
     }
 
-    debug_dump(tcx, "POST INLINING:", post_inlining.codegen_units.iter());
+    debug_dump(tcx, "POST INLINING", &post_inlining.codegen_units);
 
     // Next we try to make as many symbols "internal" as possible, so LLVM has
     // more freedom to optimize.
@@ -322,6 +322,8 @@ where
 
     result.sort_by(|a, b| a.name().as_str().cmp(b.name().as_str()));
 
+    debug_dump(tcx, "FINAL", &result);
+
     result
 }
 
@@ -346,33 +348,37 @@ struct PostInliningPartitioning<'tcx> {
     internalization_candidates: FxHashSet<MonoItem<'tcx>>,
 }
 
-fn debug_dump<'a, 'tcx, I>(tcx: TyCtxt<'tcx>, label: &str, cgus: I)
-where
-    I: Iterator<Item = &'a CodegenUnit<'tcx>>,
-    'tcx: 'a,
-{
+fn debug_dump<'a, 'tcx: 'a>(tcx: TyCtxt<'tcx>, label: &str, cgus: &[CodegenUnit<'tcx>]) {
     let dump = move || {
         use std::fmt::Write;
 
+        let num_cgus = cgus.len();
+        let max = cgus.iter().map(|cgu| cgu.size_estimate()).max().unwrap();
+        let min = cgus.iter().map(|cgu| cgu.size_estimate()).min().unwrap();
+        let ratio = max as f64 / min as f64;
+
         let s = &mut String::new();
-        let _ = writeln!(s, "{label}");
+        let _ = writeln!(
+            s,
+            "{label} ({num_cgus} CodegenUnits, max={max}, min={min}, max/min={ratio:.1}):"
+        );
         for cgu in cgus {
             let _ =
-                writeln!(s, "CodegenUnit {} estimated size {} :", cgu.name(), cgu.size_estimate());
+                writeln!(s, "CodegenUnit {} estimated size {}:", cgu.name(), cgu.size_estimate());
 
             for (mono_item, linkage) in cgu.items() {
                 let symbol_name = mono_item.symbol_name(tcx).name;
                 let symbol_hash_start = symbol_name.rfind('h');
                 let symbol_hash = symbol_hash_start.map_or("<no hash>", |i| &symbol_name[i..]);
 
-                let _ = writeln!(
+                let _ = with_no_trimmed_paths!(writeln!(
                     s,
                     " - {} [{:?}] [{}] estimated size {}",
                     mono_item,
                     linkage,
                     symbol_hash,
                     mono_item.size_estimate(tcx)
-                );
+                ));
             }
 
             let _ = writeln!(s);

compiler/rustc_parse/src/parser/diagnostics.rs

@@ -238,6 +238,7 @@ impl<'a> DerefMut for SnapshotParser<'a> {
 
 impl<'a> Parser<'a> {
     #[rustc_lint_diagnostics]
+    #[track_caller]
     pub fn struct_span_err<S: Into<MultiSpan>>(
         &self,
         sp: S,

compiler/rustc_session/src/session.rs

@@ -1732,6 +1732,7 @@ fn early_error_handler(output: config::ErrorOutputType) -> rustc_errors::Handler
 
 #[allow(rustc::untranslatable_diagnostic)]
 #[allow(rustc::diagnostic_outside_of_impl)]
+#[must_use = "ErrorGuaranteed must be returned from `run_compiler` in order to exit with a non-zero status code"]
 pub fn early_error_no_abort(
     output: config::ErrorOutputType,
     msg: impl Into<DiagnosticMessage>,

library/core/src/marker.rs

@@ -986,7 +986,7 @@ pub trait PointerLike {}
 #[rustc_on_unimplemented(message = "`{Self}` can't be used as a const parameter type")]
 pub trait ConstParamTy: StructuralEq {}
 
-/// Derive macro generating an impl of the trait `Copy`.
+/// Derive macro generating an impl of the trait `ConstParamTy`.
 #[rustc_builtin_macro]
 #[unstable(feature = "adt_const_params", issue = "95174")]
 #[cfg(not(bootstrap))]

library/core/tests/mem.rs

@@ -386,6 +386,21 @@ fn offset_of() {
     // Layout of tuples is unstable
     assert!(offset_of!((u8, u16), 0) <= size_of::<(u8, u16)>() - 1);
     assert!(offset_of!((u8, u16), 1) <= size_of::<(u8, u16)>() - 2);
+
+    #[repr(C)]
+    struct Generic<T> {
+        x: u8,
+        y: u32,
+        z: T
+    }
+
+    // Ensure that this type of generics works
+    fn offs_of_z<T>() -> usize {
+        offset_of!(Generic<T>, z)
+    }
+
+    assert_eq!(offset_of!(Generic<u8>, z), 8);
+    assert_eq!(offs_of_z::<u8>(), 8);
 }
 
 #[test]

src/bootstrap/Cargo.lock

@@ -89,9 +89,9 @@ version = "0.1.0"
 
 [[package]]
 name = "cc"
-version = "1.0.73"
+version = "1.0.77"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+checksum = "e9f73505338f7d905b19d18738976aae232eb46b8efc15554ffc56deb5d9ebe4"
 
 [[package]]
 name = "cfg-if"

src/bootstrap/builder.rs

@@ -942,7 +942,6 @@ impl<'a> Builder<'a> {
         self.run_step_descriptions(&Builder::get_step_descriptions(Kind::Doc), paths);
     }
 
-    /// NOTE: keep this in sync with `rustdoc::clean::utils::doc_rust_lang_org_channel`, or tests will fail on beta/stable.
     pub fn doc_rust_lang_org_channel(&self) -> String {
         let channel = match &*self.config.channel {
             "stable" => &self.version,

tests/rustdoc-gui/source-code-page.goml

@@ -40,24 +40,24 @@ define-function: (
 
 call-function: ("check-colors", {
     "theme": "ayu",
-    "color": "rgb(92, 103, 115)",
-    "background_color": "rgba(0, 0, 0, 0)",
-    "highlight_color": "rgb(112, 128, 144)",
+    "color": "#5c6773",
+    "background_color": "transparent",
+    "highlight_color": "#708090",
     "highlight_background_color": "rgba(255, 236, 164, 0.06)",
 })
 call-function: ("check-colors", {
     "theme": "dark",
-    "color": "rgb(59, 145, 226)",
-    "background_color": "rgba(0, 0, 0, 0)",
-    "highlight_color": "rgb(59, 145, 226)",
-    "highlight_background_color": "rgb(10, 4, 47)",
+    "color": "#3b91e2",
+    "background_color": "transparent",
+    "highlight_color": "#3b91e2",
+    "highlight_background_color": "#0a042f",
 })
 call-function: ("check-colors", {
     "theme": "light",
-    "color": "rgb(198, 126, 45)",
-    "background_color": "rgba(0, 0, 0, 0)",
-    "highlight_color": "rgb(198, 126, 45)",
-    "highlight_background_color": "rgb(253, 255, 211)",
+    "color": "#c67e2d",
+    "background_color": "transparent",
+    "highlight_color": "#c67e2d",
+    "highlight_background_color": "#fdffd3",
 })
 
 // This is to ensure that the content is correctly align with the line numbers.

tests/ui/lint/unused/auxiliary/must-use-foreign.rs

@@ -0,0 +1,12 @@
+// edition:2021
+
+use std::future::Future;
+
+pub struct Manager;
+
+impl Manager {
+    #[must_use]
+    pub async fn new() -> (Self, impl Future<Output = ()>) {
+        (Manager, async {})
+    }
+}

tests/ui/lint/unused/must-use-foreign.rs

@@ -0,0 +1,15 @@
+// edition:2021
+// aux-build:must-use-foreign.rs
+// check-pass
+
+extern crate must_use_foreign;
+
+use must_use_foreign::Manager;
+
+async fn async_main() {
+    Manager::new().await.1.await;
+}
+
+fn main() {
+    let _ = async_main();
+}

tests/ui/lint/unused/unused-async.rs

@@ -33,7 +33,7 @@ async fn test() {
     foo().await; //~ ERROR unused output of future returned by `foo` that must be used
     bar(); //~ ERROR unused return value of `bar` that must be used
     //~^ ERROR unused implementer of `Future` that must be used
-    bar().await; //~ ERROR unused output of future returned by `bar` that must be used
+    bar().await; // ok, it's not an async fn
     baz(); //~ ERROR unused implementer of `Future` that must be used
     baz().await; // ok
 }

tests/ui/lint/unused/unused-async.stderr

@@ -52,17 +52,6 @@ help: use `let _ = ...` to ignore the resulting value
 LL |     let _ = bar();
    |     +++++++
 
-error: unused output of future returned by `bar` that must be used
-  --> $DIR/unused-async.rs:36:5
-   |
-LL |     bar().await;
-   |     ^^^^^^^^^^^
-   |
-help: use `let _ = ...` to ignore the resulting value
-   |
-LL |     let _ = bar().await;
-   |     +++++++
-
 error: unused implementer of `Future` that must be used
   --> $DIR/unused-async.rs:37:5
    |
@@ -71,5 +60,5 @@ LL |     baz();
    |
    = note: futures do nothing unless you `.await` or poll them
 
-error: aborting due to 7 previous errors
+error: aborting due to 6 previous errors
 

tests/ui/offset-of/offset-of-dst-field.rs

@@ -26,8 +26,23 @@ struct Gamma {
     z: Extern,
 }
 
+struct Delta<T: ?Sized> {
+    x: u8,
+    y: u16,
+    z: T,
+}
+
 fn main() {
     offset_of!(Alpha, z); //~ ERROR the size for values of type
     offset_of!(Beta, z); //~ ERROR the size for values of type
     offset_of!(Gamma, z); //~ ERROR the size for values of type
 }
+
+fn delta() {
+    offset_of!(Delta<Alpha>, z); //~ ERROR the size for values of type
+    offset_of!(Delta<Extern>, z); //~ ERROR the size for values of type
+}
+
+fn generic_with_maybe_sized<T: ?Sized>() -> usize {
+    offset_of!(Delta<T>, z) //~ ERROR the size for values of type
+}