Rollup of 8 pull requests

compiler/rustc_hir_analysis/locales/en-US.ftl

@@ -132,3 +132,26 @@ hir_analysis_where_clause_on_main = `main` function is not allowed to have a `wh
 
 hir_analysis_track_caller_on_main = `main` function is not allowed to be `#[track_caller]`
     .label = `main` function is not allowed to be `#[track_caller]`
+
+hir_analysis_start_not_track_caller = `start` is not allowed to be `#[track_caller]`
+    .label = `start` is not allowed to be `#[track_caller]`
+
+hir_analysis_start_not_async = `start` is not allowed to be `async`
+    .label = `start` is not allowed to be `async`
+
+hir_analysis_start_function_where = start function is not allowed to have a `where` clause
+    .label = start function cannot have a `where` clause
+
+hir_analysis_start_function_parameters = start function is not allowed to have type parameters
+    .label = start function cannot have type parameters
+
+hir_analysis_main_function_return_type_generic = `main` function return type is not allowed to have generic parameters
+
+hir_analysis_main_function_async = `main` function is not allowed to be `async`
+    .label = `main` function is not allowed to be `async`
+
+hir_analysis_main_function_generic_parameters = `main` function is not allowed to have generic parameters
+    .label = `main` cannot have generic parameters
+
+hir_analysis_variadic_function_compatible_convention = C-variadic function must have a compatible calling convention, like {$conventions}
+    .label = C-variadic function must have a compatible calling convention

compiler/rustc_hir_analysis/src/errors.rs

@@ -333,3 +333,70 @@ pub(crate) struct TrackCallerOnMain {
     #[label]
     pub annotated: Span,
 }
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_start_not_track_caller)]
+pub(crate) struct StartTrackCaller {
+    #[primary_span]
+    pub span: Span,
+    #[label]
+    pub start: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_start_not_async, code = "E0752")]
+pub(crate) struct StartAsync {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_start_function_where, code = "E0647")]
+pub(crate) struct StartFunctionWhere {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_start_function_parameters, code = "E0132")]
+pub(crate) struct StartFunctionParameters {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_main_function_return_type_generic, code = "E0131")]
+pub(crate) struct MainFunctionReturnTypeGeneric {
+    #[primary_span]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_main_function_async, code = "E0752")]
+pub(crate) struct MainFunctionAsync {
+    #[primary_span]
+    pub span: Span,
+    #[label]
+    pub asyncness: Option<Span>,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_main_function_generic_parameters, code = "E0131")]
+pub(crate) struct MainFunctionGenericParameters {
+    #[primary_span]
+    pub span: Span,
+    #[label]
+    pub label_span: Option<Span>,
+}
+
+#[derive(Diagnostic)]
+#[diag(hir_analysis_variadic_function_compatible_convention, code = "E0045")]
+pub(crate) struct VariadicFunctionCompatibleConvention<'a> {
+    #[primary_span]
+    #[label]
+    pub span: Span,
+    pub conventions: &'a str,
+}

compiler/rustc_hir_analysis/src/lib.rs

@@ -98,7 +98,7 @@ mod outlives;
 pub mod structured_errors;
 mod variance;
 
-use rustc_errors::{struct_span_err, ErrorGuaranteed};
+use rustc_errors::ErrorGuaranteed;
 use rustc_errors::{DiagnosticMessage, SubdiagnosticMessage};
 use rustc_hir as hir;
 use rustc_hir::Node;
@@ -123,7 +123,6 @@ use bounds::Bounds;
 fluent_messages! { "../locales/en-US.ftl" }
 
 fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi, span: Span) {
-    const ERROR_HEAD: &str = "C-variadic function must have a compatible calling convention";
     const CONVENTIONS_UNSTABLE: &str = "`C`, `cdecl`, `win64`, `sysv64` or `efiapi`";
     const CONVENTIONS_STABLE: &str = "`C` or `cdecl`";
     const UNSTABLE_EXPLAIN: &str =
@@ -155,8 +154,7 @@ fn require_c_abi_if_c_variadic(tcx: TyCtxt<'_>, decl: &hir::FnDecl<'_>, abi: Abi
         (true, false) => CONVENTIONS_UNSTABLE,
     };
 
-    let mut err = struct_span_err!(tcx.sess, span, E0045, "{}, like {}", ERROR_HEAD, conventions);
-    err.span_label(span, ERROR_HEAD).emit();
+    tcx.sess.emit_err(errors::VariadicFunctionCompatibleConvention { span, conventions });
 }
 
 fn require_same_types<'tcx>(
@@ -258,15 +256,10 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
     let main_fn_predicates = tcx.predicates_of(main_def_id);
     if main_fn_generics.count() != 0 || !main_fnsig.bound_vars().is_empty() {
         let generics_param_span = main_fn_generics_params_span(tcx, main_def_id);
-        let msg = "`main` function is not allowed to have generic \
-            parameters";
-        let mut diag =
-            struct_span_err!(tcx.sess, generics_param_span.unwrap_or(main_span), E0131, "{}", msg);
-        if let Some(generics_param_span) = generics_param_span {
-            let label = "`main` cannot have generic parameters";
-            diag.span_label(generics_param_span, label);
-        }
-        diag.emit();
+        tcx.sess.emit_err(errors::MainFunctionGenericParameters {
+            span: generics_param_span.unwrap_or(main_span),
+            label_span: generics_param_span,
+        });
         error = true;
     } else if !main_fn_predicates.predicates.is_empty() {
         // generics may bring in implicit predicates, so we skip this check if generics is present.
@@ -280,17 +273,8 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
 
     let main_asyncness = tcx.asyncness(main_def_id);
     if let hir::IsAsync::Async = main_asyncness {
-        let mut diag = struct_span_err!(
-            tcx.sess,
-            main_span,
-            E0752,
-            "`main` function is not allowed to be `async`"
-        );
         let asyncness_span = main_fn_asyncness_span(tcx, main_def_id);
-        if let Some(asyncness_span) = asyncness_span {
-            diag.span_label(asyncness_span, "`main` function is not allowed to be `async`");
-        }
-        diag.emit();
+        tcx.sess.emit_err(errors::MainFunctionAsync { span: main_span, asyncness: asyncness_span });
         error = true;
     }
 
@@ -308,9 +292,7 @@ fn check_main_fn_ty(tcx: TyCtxt<'_>, main_def_id: DefId) {
         let return_ty = main_fnsig.output();
         let return_ty_span = main_fn_return_type_span(tcx, main_def_id).unwrap_or(main_span);
         if !return_ty.bound_vars().is_empty() {
-            let msg = "`main` function return type is not allowed to have generic \
-                    parameters";
-            struct_span_err!(tcx.sess, return_ty_span, E0131, "{}", msg).emit();
+            tcx.sess.emit_err(errors::MainFunctionReturnTypeGeneric { span: return_ty_span });
             error = true;
         }
         let return_ty = return_ty.skip_binder();
@@ -367,56 +349,28 @@ fn check_start_fn_ty(tcx: TyCtxt<'_>, start_def_id: DefId) {
                 if let hir::ItemKind::Fn(sig, generics, _) = &it.kind {
                     let mut error = false;
                     if !generics.params.is_empty() {
-                        struct_span_err!(
-                            tcx.sess,
-                            generics.span,
-                            E0132,
-                            "start function is not allowed to have type parameters"
-                        )
-                        .span_label(generics.span, "start function cannot have type parameters")
-                        .emit();
+                        tcx.sess.emit_err(errors::StartFunctionParameters { span: generics.span });
                         error = true;
                     }
                     if generics.has_where_clause_predicates {
-                        struct_span_err!(
-                            tcx.sess,
-                            generics.where_clause_span,
-                            E0647,
-                            "start function is not allowed to have a `where` clause"
-                        )
-                        .span_label(
-                            generics.where_clause_span,
-                            "start function cannot have a `where` clause",
-                        )
-                        .emit();
+                        tcx.sess.emit_err(errors::StartFunctionWhere {
+                            span: generics.where_clause_span,
+                        });
                         error = true;
                     }
                     if let hir::IsAsync::Async = sig.header.asyncness {
                         let span = tcx.def_span(it.owner_id);
-                        struct_span_err!(
-                            tcx.sess,
-                            span,
-                            E0752,
-                            "`start` is not allowed to be `async`"
-                        )
-                        .span_label(span, "`start` is not allowed to be `async`")
-                        .emit();
+                        tcx.sess.emit_err(errors::StartAsync { span: span });
                         error = true;
                     }
 
                     let attrs = tcx.hir().attrs(start_id);
                     for attr in attrs {
                         if attr.has_name(sym::track_caller) {
-                            tcx.sess
-                                .struct_span_err(
-                                    attr.span,
-                                    "`start` is not allowed to be `#[track_caller]`",
-                                )
-                                .span_label(
-                                    start_span,
-                                    "`start` is not allowed to be `#[track_caller]`",
-                                )
-                                .emit();
+                            tcx.sess.emit_err(errors::StartTrackCaller {
+                                span: attr.span,
+                                start: start_span,
+                            });
                             error = true;
                         }
                     }

compiler/rustc_middle/src/ty/query.rs

@@ -328,8 +328,9 @@ macro_rules! define_callbacks {
 
                 Providers {
                     $($name: |_, key| bug!(
-                        "`tcx.{}({:?})` is not supported for {} crate;\n
-                        hint: Queries can be either made to the local crate, or the external crate. This error means you tried to use it for one that's not supported.\n
+                        "`tcx.{}({:?})` is not supported for {} crate;\n\
+                        hint: Queries can be either made to the local crate, or the external crate. \
+                        This error means you tried to use it for one that's not supported.\n\
                         If that's not the case, {} was likely never assigned to a provider function.\n",
                         stringify!($name),
                         key,

library/alloc/src/vec/mod.rs

@@ -378,8 +378,8 @@ mod spec_extend;
 /// Currently, `Vec` does not guarantee the order in which elements are dropped.
 /// The order has changed in the past and may change again.
 ///
-/// [`get`]: ../../std/vec/struct.Vec.html#method.get
-/// [`get_mut`]: ../../std/vec/struct.Vec.html#method.get_mut
+/// [`get`]: slice::get
+/// [`get_mut`]: slice::get_mut
 /// [`String`]: crate::string::String
 /// [`&str`]: type@str
 /// [`shrink_to_fit`]: Vec::shrink_to_fit

src/bootstrap/format.rs

@@ -218,7 +218,7 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
                     WalkBuilder::new(first)
                 }
             } else {
-                WalkBuilder::new(first)
+                WalkBuilder::new(src.join(first))
             };
 
             for path in &paths[1..] {
@@ -229,7 +229,7 @@ pub fn format(build: &Builder<'_>, check: bool, paths: &[PathBuf]) {
                         walker.add(path);
                     }
                 } else {
-                    walker.add(path);
+                    walker.add(src.join(path));
                 }
             }
 

src/ci/docker/host-x86_64/x86_64-gnu-tools/browser-ui-test.version

@@ -1 +1 @@
-0.14.3
+0.14.4

src/ci/docker/scripts/fuchsia-test-runner.py

@@ -507,9 +507,8 @@ def start(self):
     bin/{exe_name}={bin_path}
     lib/{libstd_name}={rust_dir}/lib/rustlib/{rustlib_dir}/lib/{libstd_name}
     lib/{libtest_name}={rust_dir}/lib/rustlib/{rustlib_dir}/lib/{libtest_name}
-    lib/ld.so.1={sdk_dir}/arch/{target_arch}/sysroot/lib/libc.so
-    lib/libzircon.so={sdk_dir}/arch/{target_arch}/sysroot/lib/libzircon.so
-    lib/libfdio.so={sdk_dir}/arch/{target_arch}/lib/libfdio.so
+    lib/ld.so.1={sdk_dir}/arch/{target_arch}/sysroot/dist/lib/ld.so.1
+    lib/libfdio.so={sdk_dir}/arch/{target_arch}/dist/libfdio.so
     """
 
     TEST_ENV_VARS: ClassVar[List[str]] = [
@@ -844,23 +843,34 @@ def debug(self, args):
             "--",
             "--build-id-dir",
             os.path.join(self.sdk_dir, ".build-id"),
-            "--build-id-dir",
-            os.path.join(self.libs_dir(), ".build-id"),
         ]
 
-        # Add rust source if it's available
-        if args.rust_src is not None:
+        libs_build_id_path = os.path.join(self.libs_dir(), ".build-id")
+        if os.path.exists(libs_build_id_path):
+            # Add .build-id symbols if installed libs have been stripped into a
+            # .build-id directory
             command += [
-                "--build-dir",
-                args.rust_src,
+                "--build-id-dir",
+                libs_build_id_path,
+            ]
+        else:
+            # If no .build-id directory is detected, then assume that the shared
+            # libs contain their debug symbols
+            command += [
+                f"--symbol-path={self.rust_dir}/lib/rustlib/{self.target}/lib",
             ]
 
+        # Add rust source if it's available
+        rust_src_map = None
+        if args.rust_src is not None:
+            # This matches the remapped prefix used by compiletest. There's no
+            # clear way that we can determine this, so it's hard coded.
+            rust_src_map = f"/rustc/FAKE_PREFIX={args.rust_src}"
+
         # Add fuchsia source if it's available
+        fuchsia_src_map = None
         if args.fuchsia_src is not None:
-            command += [
-                "--build-dir",
-                os.path.join(args.fuchsia_src, "out", "default"),
-            ]
+            fuchsia_src_map = f"./../..={args.fuchsia_src}"
 
         # Load debug symbols for the test binary and automatically attach
         if args.test is not None:
@@ -883,7 +893,28 @@ def debug(self, args):
                 test_name,
             )
 
+            # The fake-test-src-base directory maps to the suite directory
+            # e.g. tests/ui/foo.rs has a path of rust/fake-test-src-base/foo.rs
+            fake_test_src_base = os.path.join(
+                args.rust_src,
+                "fake-test-src-base",
+            )
+            real_test_src_base = os.path.join(
+                args.rust_src,
+                "tests",
+                args.test.split(os.path.sep)[0],
+            )
+            test_src_map = f"{fake_test_src_base}={real_test_src_base}"
+
             with open(self.zxdb_script_path(), mode="w", encoding="utf-8") as f:
+                print(f"set source-map += {test_src_map}", file=f)
+
+                if rust_src_map is not None:
+                    print(f"set source-map += {rust_src_map}", file=f)
+
+                if fuchsia_src_map is not None:
+                    print(f"set source-map += {fuchsia_src_map}", file=f)
+
                 print(f"attach {test_name[:31]}", file=f)
 
             command += [
@@ -900,6 +931,20 @@ def debug(self, args):
         # Connect to the running emulator with zxdb
         subprocess.run(command, env=self.ffx_cmd_env(), check=False)
 
+    def syslog(self, args):
+        subprocess.run(
+            [
+                self.tool_path("ffx"),
+                "--config",
+                self.ffx_user_config_path(),
+                "log",
+                "--since",
+                "now",
+            ],
+            env=self.ffx_cmd_env(),
+            check=False,
+        )
+
 
 def start(args):
     test_env = TestEnvironment.from_args(args)
@@ -933,6 +978,12 @@ def debug(args):
     return 0
 
 
+def syslog(args):
+    test_env = TestEnvironment.read_from_file()
+    test_env.syslog(args)
+    return 0
+
+
 def main():
     parser = argparse.ArgumentParser()
 
@@ -1028,6 +1079,11 @@ def print_help(args):
     )
     debug_parser.set_defaults(func=debug)
 
+    syslog_parser = subparsers.add_parser(
+        "syslog", help="prints the device syslog"
+    )
+    syslog_parser.set_defaults(func=syslog)
+
     args = parser.parse_args()
     return args.func(args)
 

src/doc/rustc/src/platform-support/fuchsia.md

@@ -687,7 +687,9 @@ Rust compiler locally. See "[Targeting Fuchsia with a compiler built from source
 for the steps to build locally.
 
 You'll also need to download a copy of the Fuchsia SDK. The current minimum
-supported SDK version is [9.20220726.1.1](https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/linux-amd64/+/version:9.20220726.1.1).
+supported SDK version is [10.20221207.2.89][minimum_supported_sdk_version].
+
+[minimum_supported_sdk_version]: https://chrome-infra-packages.appspot.com/p/fuchsia/sdk/core/linux-amd64/+/version:10.20221207.2.89
 
 Fuchsia's test runner interacts with the Fuchsia emulator and is located at
 `src/ci/docker/scripts/fuchsia-test-runner.py`. We can use it to start our
@@ -697,7 +699,7 @@ test environment with:
 src/ci/docker/scripts/fuchsia-test-runner.py start
     --rust ${RUST_SRC_PATH}/install
     --sdk ${SDK_PATH}
-    --target-triple {x86_64-unknown-fuchsia|aarch64-unknown-fuchsia}
+    --target {x86_64-unknown-fuchsia|aarch64-unknown-fuchsia}
 ```
 
 Where `${RUST_SRC_PATH}/install` is the `prefix` set in `config.toml` and
@@ -717,17 +719,11 @@ run the full `tests/ui` test suite:
     --target x86_64-unknown-fuchsia                                           \
     --run=always --jobs 1                                                     \
     --test-args --target-rustcflags                                           \
-    --test-args -L                                                            \
-    --test-args --target-rustcflags                                           \
-    --test-args ${SDK_PATH}/arch/{x64|arm64}/sysroot/lib                      \
-    --test-args --target-rustcflags                                           \
-    --test-args -L                                                            \
+    --test-args -Lnative=${SDK_PATH}/arch/{x64|arm64}/sysroot/lib             \
     --test-args --target-rustcflags                                           \
-    --test-args ${SDK_PATH}/arch/{x64|arm64}/lib                              \
+    --test-args -Lnative=${SDK_PATH}/arch/{x64|arm64}/lib                     \
     --test-args --target-rustcflags                                           \
-    --test-args -Cpanic=abort                                                 \
-    --test-args --target-rustcflags                                           \
-    --test-args -Zpanic_abort_tests                                           \
+    --test-args -Clink-arg=--undefined-version                                \
     --test-args --remote-test-client                                          \
     --test-args src/ci/docker/scripts/fuchsia-test-runner.py                  \
 )
@@ -736,7 +732,18 @@ run the full `tests/ui` test suite:
 *Note: The test suite cannot be run in parallel at the moment, so `x.py`
 must be run with `--jobs 1` to ensure only one test runs at a time.*
 
-When finished, the test runner can be used to stop the test environment:
+By default, `x.py` compiles test binaries with `panic=unwind`. If you built your
+Rust toolchain with `-Cpanic=abort`, you need to tell `x.py` to compile test
+binaries with `panic=abort` as well:
+
+```sh
+    --test-args --target-rustcflags                                           \
+    --test-args -Cpanic=abort                                                 \
+    --test-args --target-rustcflags                                           \
+    --test-args -Zpanic_abort_tests                                           \
+```
+
+When finished testing, the test runner can be used to stop the test environment:
 
 ```sh
 src/ci/docker/scripts/fuchsia-test-runner.py stop
@@ -764,8 +771,9 @@ ${SDK_PATH}/tools/${ARCH}/ffx debug connect -- \
 * `--symbol-path` gets required symbol paths, which are
 necessary for stepping through your program.
 
-The "[displaying source code in `zxdb`](#displaying-source-code-in-zxdb)" section describes how you can
-display Rust and/or Fuchsia source code in your debugging session.
+The "[displaying source code in `zxdb`](#displaying-source-code-in-zxdb)"
+section describes how you can display Rust and/or Fuchsia source code in your
+debugging session.
 
 ### Using `zxdb`
 
@@ -866,6 +874,64 @@ ${SDK_PATH}/tools/${ARCH}/ffx debug connect -- \
  Linking to a Fuchsia checkout can help with debugging Fuchsia libraries,
  such as [fdio].
 
+### Debugging the compiler test suite
+
+Debugging the compiler test suite requires some special configuration:
+
+First, we have to properly configure zxdb so it will be able to find debug
+symbols and source information for our test. The test runner can do this for us
+with:
+
+```sh
+src/ci/docker/scripts/fuchsia-test-runner.py debug                            \
+    --rust-src ${RUST_SRC_PATH}                                               \
+    --fuchsia-src ${FUCHSIA_SRC_PATH}                                         \
+    --test ${TEST}
+```
+
+where `${TEST}` is relative to Rust's `tests` directory (e.g. `ui/abi/...`).
+
+This will start a zxdb session that is properly configured for the specific test
+being run. All three arguments are optional, so you can omit `--fuchsia-src` if
+you don't have it downloaded. Now is a good time to set any desired breakpoints,
+like `b main`.
+
+Next, we have to tell `x.py` not to optimize or strip debug symbols from our
+test suite binaries. We can do this by passing some new arguments to `rustc`
+through our `x.py` invocation. The full invocation is:
+
+```sh
+( \
+    source config-env.sh &&                                                   \
+    ./x.py                                                                    \
+    --config config.toml                                                      \
+    --stage=2                                                                 \
+    test tests/${TEST}                                                        \
+    --target x86_64-unknown-fuchsia                                           \
+    --run=always --jobs 1                                                     \
+    --test-args --target-rustcflags                                           \
+    --test-args -Lnative=${SDK_PATH}/arch/{x64|arm64}/sysroot/lib             \
+    --test-args --target-rustcflags                                           \
+    --test-args -Lnative=${SDK_PATH}/arch/{x64|arm64}/lib                     \
+    --test-args --target-rustcflags                                           \
+    --test-args -Clink-arg=--undefined-version                                \
+    --test-args --target-rustcflags                                           \
+    --test-args -Cdebuginfo=2                                                 \
+    --test-args --target-rustcflags                                           \
+    --test-args -Copt-level=0                                                 \
+    --test-args --target-rustcflags                                           \
+    --test-args -Cstrip=none                                                  \
+    --test-args --remote-test-client                                          \
+    --test-args src/ci/docker/scripts/fuchsia-test-runner.py                  \
+)
+```
+
+*If you built your Rust toolchain with `panic=abort`, make sure to include the
+previous flags so your test binaries are also compiled with `panic=abort`.*
+
+Upon running this command, the test suite binary will be run and zxdb will
+attach and load any relevant debug symbols.
+
 [Fuchsia team]: https://team-api.infra.rust-lang.org/v1/teams/fuchsia.json
 [Fuchsia]: https://fuchsia.dev/
 [source tree]: https://fuchsia.dev/fuchsia-src/get-started/learn/build

src/librustdoc/html/markdown.rs

@@ -552,10 +552,7 @@ impl<'a, I: Iterator<Item = Event<'a>>> SummaryLine<'a, I> {
 }
 
 fn check_if_allowed_tag(t: &Tag<'_>) -> bool {
-    matches!(
-        t,
-        Tag::Paragraph | Tag::Item | Tag::Emphasis | Tag::Strong | Tag::Link(..) | Tag::BlockQuote
-    )
+    matches!(t, Tag::Paragraph | Tag::Emphasis | Tag::Strong | Tag::Link(..) | Tag::BlockQuote)
 }
 
 fn is_forbidden_tag(t: &Tag<'_>) -> bool {

tests/rustdoc-gui/help-page.goml

@@ -68,5 +68,4 @@ size: (1000, 1000) // Popover only appears when the screen width is >700px.
 assert-false: "#help"
 click: "#help-button > a"
 click: ".popover a[href='https://doc.rust-lang.org/rustdoc/']"
-wait-for: 2000
-assert-document-property: {"URL": "https://doc.rust-lang.org/rustdoc/"}
+wait-for-document-property: {"URL": "https://doc.rust-lang.org/rustdoc/"}

tests/rustdoc-ui/auxiliary/panic-handler.rs

@@ -0,0 +1,9 @@
+// compile-flags: -C panic=abort
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_: &core::panic::PanicInfo) -> ! {
+    loop {}
+}

tests/rustdoc-ui/issue-107918.rs

@@ -0,0 +1,11 @@
+// aux-build:panic-handler.rs
+// compile-flags: --document-private-items
+// build-pass
+
+#![no_std]
+#![no_main]
+
+#[panic_handler]
+fn panic(_: &core::panic::PanicInfo) -> ! {
+    loop {}
+}

tests/rustdoc/item-desc-list-at-start.item-table.html

@@ -0,0 +1 @@
+<ul class="item-table"><li><div class="item-name"><a class="constant" href="constant.MY_CONSTANT.html" title="constant item_desc_list_at_start::MY_CONSTANT">MY_CONSTANT</a></div><div class="desc docblock-short">Groups: <code>SamplePatternSGIS</code>, <code>SamplePatternEXT</code></div></li></ul>

tests/rustdoc/item-desc-list-at-start.rs

@@ -0,0 +1,9 @@
+// @has item_desc_list_at_start/index.html
+// @count - '//ul[@class="item-table"]/li/div/li' 0
+// @count - '//ul[@class="item-table"]/li' 1
+// @snapshot item-table - '//ul[@class="item-table"]'
+
+// based on https://docs.rs/gl_constants/0.1.1/src/gl_constants/lib.rs.html#16
+
+/// * Groups: `SamplePatternSGIS`, `SamplePatternEXT`
+pub const MY_CONSTANT: usize = 0;