Collect and use #![doc(test(attr(..)))] at module level too

src/librustdoc/doctest.rs

@@ -45,8 +45,6 @@ pub(crate) struct GlobalTestOptions {
     /// Whether inserting extra indent spaces in code block,
     /// default is `false`, only `true` for generating code link of Rust playground
     pub(crate) insert_indent_space: bool,
-    /// Additional crate-level attributes to add to doctests.
-    pub(crate) attrs: Vec<String>,
     /// Path to file containing arguments for the invocation of rustc.
     pub(crate) args_file: PathBuf,
 }
@@ -371,12 +369,9 @@ fn scrape_test_config(
     attrs: &[hir::Attribute],
     args_file: PathBuf,
 ) -> GlobalTestOptions {
-    use rustc_ast_pretty::pprust;
-
     let mut opts = GlobalTestOptions {
         crate_name,
         no_crate_inject: false,
-        attrs: Vec::new(),
         insert_indent_space: false,
         args_file,
     };
@@ -393,13 +388,7 @@ fn scrape_test_config(
         if attr.has_name(sym::no_crate_inject) {
             opts.no_crate_inject = true;
         }
-        if attr.has_name(sym::attr)
-            && let Some(l) = attr.meta_item_list()
-        {
-            for item in l {
-                opts.attrs.push(pprust::meta_list_item_to_string(item));
-            }
-        }
+        // NOTE: `test(attr(..))` is handled when discovering the individual tests
     }
 
     opts
@@ -848,6 +837,7 @@ pub(crate) struct ScrapedDocTest {
     text: String,
     name: String,
     span: Span,
+    global_crate_attrs: Vec<String>,
 }
 
 impl ScrapedDocTest {
@@ -858,6 +848,7 @@ impl ScrapedDocTest {
         langstr: LangString,
         text: String,
         span: Span,
+        global_crate_attrs: Vec<String>,
     ) -> Self {
         let mut item_path = logical_path.join("::");
         item_path.retain(|c| c != ' ');
@@ -867,7 +858,7 @@ impl ScrapedDocTest {
         let name =
             format!("{} - {item_path}(line {line})", filename.prefer_remapped_unconditionaly());
 
-        Self { filename, line, langstr, text, name, span }
+        Self { filename, line, langstr, text, name, span, global_crate_attrs }
     }
     fn edition(&self, opts: &RustdocOptions) -> Edition {
         self.langstr.edition.unwrap_or(opts.edition)
@@ -949,6 +940,7 @@ impl CreateRunnableDocTests {
         let edition = scraped_test.edition(&self.rustdoc_options);
         let doctest = BuildDocTestBuilder::new(&scraped_test.text)
             .crate_name(&self.opts.crate_name)
+            .global_crate_attrs(scraped_test.global_crate_attrs.clone())
             .edition(edition)
             .can_merge_doctests(self.can_merge_doctests)
             .test_id(test_id)

src/librustdoc/doctest/extracted.rs

@@ -35,13 +35,16 @@ impl ExtractedDocTests {
     ) {
         let edition = scraped_test.edition(options);
 
-        let ScrapedDocTest { filename, line, langstr, text, name, .. } = scraped_test;
+        let ScrapedDocTest { filename, line, langstr, text, name, global_crate_attrs, .. } =
+            scraped_test;
 
         let doctest = BuildDocTestBuilder::new(&text)
             .crate_name(&opts.crate_name)
+            .global_crate_attrs(global_crate_attrs)
             .edition(edition)
             .lang_str(&langstr)
             .build(None);
+
         let (full_test_code, size) = doctest.generate_unique_doctest(
             &text,
             langstr.test_harness,

src/librustdoc/doctest/make.rs

@@ -45,6 +45,7 @@ pub(crate) struct BuildDocTestBuilder<'a> {
     test_id: Option<String>,
     lang_str: Option<&'a LangString>,
     span: Span,
+    global_crate_attrs: Vec<String>,
 }
 
 impl<'a> BuildDocTestBuilder<'a> {
@@ -57,6 +58,7 @@ impl<'a> BuildDocTestBuilder<'a> {
             test_id: None,
             lang_str: None,
             span: DUMMY_SP,
+            global_crate_attrs: Vec::new(),
         }
     }
 
@@ -96,6 +98,12 @@ impl<'a> BuildDocTestBuilder<'a> {
         self
     }
 
+    #[inline]
+    pub(crate) fn global_crate_attrs(mut self, global_crate_attrs: Vec<String>) -> Self {
+        self.global_crate_attrs = global_crate_attrs;
+        self
+    }
+
     pub(crate) fn build(self, dcx: Option<DiagCtxtHandle<'_>>) -> DocTestBuilder {
         let BuildDocTestBuilder {
             source,
@@ -106,6 +114,7 @@ impl<'a> BuildDocTestBuilder<'a> {
             test_id,
             lang_str,
             span,
+            global_crate_attrs,
         } = self;
         let can_merge_doctests = can_merge_doctests
             && lang_str.is_some_and(|lang_str| {
@@ -133,6 +142,7 @@ impl<'a> BuildDocTestBuilder<'a> {
             // If the AST returned an error, we don't want this doctest to be merged with the
             // others.
             return DocTestBuilder::invalid(
+                Vec::new(),
                 String::new(),
                 String::new(),
                 String::new(),
@@ -155,6 +165,7 @@ impl<'a> BuildDocTestBuilder<'a> {
         DocTestBuilder {
             supports_color,
             has_main_fn,
+            global_crate_attrs,
             crate_attrs,
             maybe_crate_attrs,
             crates,
@@ -173,6 +184,7 @@ pub(crate) struct DocTestBuilder {
     pub(crate) supports_color: bool,
     pub(crate) already_has_extern_crate: bool,
     pub(crate) has_main_fn: bool,
+    pub(crate) global_crate_attrs: Vec<String>,
     pub(crate) crate_attrs: String,
     /// If this is a merged doctest, it will be put into `everything_else`, otherwise it will
     /// put into `crate_attrs`.
@@ -186,6 +198,7 @@ pub(crate) struct DocTestBuilder {
 
 impl DocTestBuilder {
     fn invalid(
+        global_crate_attrs: Vec<String>,
         crate_attrs: String,
         maybe_crate_attrs: String,
         crates: String,
@@ -195,6 +208,7 @@ impl DocTestBuilder {
         Self {
             supports_color: false,
             has_main_fn: false,
+            global_crate_attrs,
             crate_attrs,
             maybe_crate_attrs,
             crates,
@@ -224,7 +238,8 @@ impl DocTestBuilder {
         let mut line_offset = 0;
         let mut prog = String::new();
         let everything_else = self.everything_else.trim();
-        if opts.attrs.is_empty() {
+
+        if self.global_crate_attrs.is_empty() {
             // If there aren't any attributes supplied by #![doc(test(attr(...)))], then allow some
             // lints that are commonly triggered in doctests. The crate-level test attributes are
             // commonly used to make tests fail in case they trigger warnings, so having this there in
@@ -233,8 +248,8 @@ impl DocTestBuilder {
             line_offset += 1;
         }
 
-        // Next, any attributes that came from the crate root via #![doc(test(attr(...)))].
-        for attr in &opts.attrs {
+        // Next, any attributes that came from #![doc(test(attr(...)))].
+        for attr in &self.global_crate_attrs {
             prog.push_str(&format!("#![{attr}]\n"));
             line_offset += 1;
         }

src/librustdoc/doctest/markdown.rs

@@ -31,6 +31,7 @@ impl DocTestVisitor for MdCollector {
             config,
             test,
             DUMMY_SP,
+            Vec::new(),
         ));
     }
 
@@ -96,7 +97,6 @@ pub(crate) fn test(input: &Input, options: Options) -> Result<(), String> {
         crate_name,
         no_crate_inject: true,
         insert_indent_space: false,
-        attrs: vec![],
         args_file,
     };
 

src/librustdoc/doctest/runner.rs

@@ -12,6 +12,7 @@ use crate::html::markdown::{Ignore, LangString};
 /// Convenient type to merge compatible doctests into one.
 pub(crate) struct DocTestRunner {
     crate_attrs: FxIndexSet<String>,
+    global_crate_attrs: FxIndexSet<String>,
     ids: String,
     output: String,
     output_merged_tests: String,
@@ -23,6 +24,7 @@ impl DocTestRunner {
     pub(crate) fn new() -> Self {
         Self {
             crate_attrs: FxIndexSet::default(),
+            global_crate_attrs: FxIndexSet::default(),
             ids: String::new(),
             output: String::new(),
             output_merged_tests: String::new(),
@@ -46,6 +48,9 @@ impl DocTestRunner {
             for line in doctest.crate_attrs.split('\n') {
                 self.crate_attrs.insert(line.to_string());
             }
+            for line in &doctest.global_crate_attrs {
+                self.global_crate_attrs.insert(line.to_string());
+            }
         }
         self.ids.push_str(&format!(
             "tests.push({}::TEST);\n",
@@ -85,7 +90,7 @@ impl DocTestRunner {
             code_prefix.push('\n');
         }
 
-        if opts.attrs.is_empty() {
+        if self.global_crate_attrs.is_empty() {
             // If there aren't any attributes supplied by #![doc(test(attr(...)))], then allow some
             // lints that are commonly triggered in doctests. The crate-level test attributes are
             // commonly used to make tests fail in case they trigger warnings, so having this there in
@@ -93,8 +98,8 @@ impl DocTestRunner {
             code_prefix.push_str("#![allow(unused)]\n");
         }
 
-        // Next, any attributes that came from the crate root via #![doc(test(attr(...)))].
-        for attr in &opts.attrs {
+        // Next, any attributes that came from #![doc(test(attr(...)))].
+        for attr in &self.global_crate_attrs {
             code_prefix.push_str(&format!("#![{attr}]\n"));
         }
 

src/librustdoc/doctest/rust.rs

@@ -4,6 +4,7 @@ use std::cell::Cell;
 use std::env;
 use std::sync::Arc;
 
+use rustc_ast_pretty::pprust;
 use rustc_data_structures::fx::FxHashSet;
 use rustc_hir::def_id::{CRATE_DEF_ID, LocalDefId};
 use rustc_hir::{self as hir, CRATE_HIR_ID, intravisit};
@@ -11,7 +12,7 @@ use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::TyCtxt;
 use rustc_resolve::rustdoc::span_of_fragments;
 use rustc_span::source_map::SourceMap;
-use rustc_span::{BytePos, DUMMY_SP, FileName, Pos, Span};
+use rustc_span::{BytePos, DUMMY_SP, FileName, Pos, Span, sym};
 
 use super::{DocTestVisitor, ScrapedDocTest};
 use crate::clean::{Attributes, extract_cfg_from_attrs};
@@ -22,6 +23,7 @@ struct RustCollector {
     tests: Vec<ScrapedDocTest>,
     cur_path: Vec<String>,
     position: Span,
+    global_crate_attrs: Vec<String>,
 }
 
 impl RustCollector {
@@ -75,6 +77,7 @@ impl DocTestVisitor for RustCollector {
             config,
             test,
             span,
+            self.global_crate_attrs.clone(),
         ));
     }
 
@@ -94,6 +97,7 @@ impl<'tcx> HirCollector<'tcx> {
             cur_path: vec![],
             position: DUMMY_SP,
             tests: vec![],
+            global_crate_attrs: Vec::new(),
         };
         Self { codes, tcx, collector }
     }
@@ -170,6 +174,40 @@ impl<'tcx> intravisit::Visitor<'tcx> for HirCollector<'tcx> {
         self.tcx
     }
 
+    fn visit_mod(&mut self, m: &'tcx hir::Mod<'tcx>, _s: Span, hir_id: hir::HirId) {
+        let attrs = self.tcx.hir_attrs(hir_id);
+
+        if !attrs.is_empty() {
+            // Try collecting `#![doc(test(attr(...)))]` from the attribute module
+            let old_len = self.collector.global_crate_attrs.len();
+            for doc_test_attrs in attrs
+                .iter()
+                .filter(|a| a.has_name(sym::doc))
+                .flat_map(|a| a.meta_item_list().unwrap_or_default())
+                .filter(|a| a.has_name(sym::test))
+            {
+                let Some(doc_test_attrs) = doc_test_attrs.meta_item_list() else { continue };
+                for attr in doc_test_attrs
+                    .iter()
+                    .filter(|a| a.has_name(sym::attr))
+                    .flat_map(|a| a.meta_item_list().unwrap_or_default())
+                    .map(|i| pprust::meta_list_item_to_string(i))
+                {
+                    // Add the additional attributes to the global_crate_attrs vector
+                    self.collector.global_crate_attrs.push(attr);
+                }
+            }
+
+            let r = intravisit::walk_mod(self, m);
+
+            // Restore global_crate_attrs to it's previous size/content
+            self.collector.global_crate_attrs.truncate(old_len);
+            r
+        } else {
+            intravisit::walk_mod(self, m)
+        }
+    }
+
     fn visit_item(&mut self, item: &'tcx hir::Item<'_>) {
         let name = match &item.kind {
             hir::ItemKind::Impl(impl_) => {

src/librustdoc/doctest/tests.rs

@@ -7,9 +7,11 @@ fn make_test(
     crate_name: Option<&str>,
     dont_insert_main: bool,
     opts: &GlobalTestOptions,
+    global_crate_attrs: Vec<&str>,
     test_id: Option<&str>,
 ) -> (String, usize) {
-    let mut builder = BuildDocTestBuilder::new(test_code);
+    let mut builder = BuildDocTestBuilder::new(test_code)
+        .global_crate_attrs(global_crate_attrs.into_iter().map(|a| a.to_string()).collect());
     if let Some(crate_name) = crate_name {
         builder = builder.crate_name(crate_name);
     }
@@ -28,7 +30,6 @@ fn default_global_opts(crate_name: impl Into<String>) -> GlobalTestOptions {
         crate_name: crate_name.into(),
         no_crate_inject: false,
         insert_indent_space: false,
-        attrs: vec![],
         args_file: PathBuf::new(),
     }
 }
@@ -43,7 +44,7 @@ fn main() {
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -58,7 +59,7 @@ fn main() {
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -77,7 +78,7 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 3));
 }
 
@@ -94,7 +95,7 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -112,7 +113,7 @@ use std::*;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("std"), false, &opts, None);
+    let (output, len) = make_test(input, Some("std"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -131,7 +132,7 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -148,7 +149,7 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -156,8 +157,7 @@ assert_eq!(2+2, 4);
 fn make_test_opts_attrs() {
     // If you supplied some doctest attributes with `#![doc(test(attr(...)))]`, it will use
     // those instead of the stock `#![allow(unused)]`.
-    let mut opts = default_global_opts("asdf");
-    opts.attrs.push("feature(sick_rad)".to_string());
+    let opts = default_global_opts("asdf");
     let input = "use asdf::qwop;
 assert_eq!(2+2, 4);";
     let expected = "#![feature(sick_rad)]
@@ -168,11 +168,10 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) =
+        make_test(input, Some("asdf"), false, &opts, vec!["feature(sick_rad)"], None);
     assert_eq!((output, len), (expected, 3));
 
-    // Adding more will also bump the returned line offset.
-    opts.attrs.push("feature(hella_dope)".to_string());
     let expected = "#![feature(sick_rad)]
 #![feature(hella_dope)]
 #[allow(unused_extern_crates)]
@@ -182,7 +181,18 @@ use asdf::qwop;
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(
+        input,
+        Some("asdf"),
+        false,
+        &opts,
+        vec![
+            "feature(sick_rad)",
+            // Adding more will also bump the returned line offset.
+            "feature(hella_dope)",
+        ],
+        None,
+    );
     assert_eq!((output, len), (expected, 4));
 }
 
@@ -200,7 +210,7 @@ fn main() {
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -216,7 +226,7 @@ fn main() {
     assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 1));
 }
 
@@ -232,7 +242,7 @@ fn main() {
 assert_eq!(2+2, 4);
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -246,7 +256,7 @@ assert_eq!(2+2, 4);";
 //Ceci n'est pas une `fn main`
 assert_eq!(2+2, 4);"
         .to_string();
-    let (output, len) = make_test(input, None, true, &opts, None);
+    let (output, len) = make_test(input, None, true, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 1));
 }
 
@@ -264,7 +274,7 @@ assert_eq!(2+2, 4);
 }"
     .to_string();
 
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -284,7 +294,7 @@ assert_eq!(asdf::foo, 4);
 }"
     .to_string();
 
-    let (output, len) = make_test(input, Some("asdf"), false, &opts, None);
+    let (output, len) = make_test(input, Some("asdf"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 3));
 }
 
@@ -302,7 +312,7 @@ test_wrapper! {
 }"
     .to_string();
 
-    let (output, len) = make_test(input, Some("my_crate"), false, &opts, None);
+    let (output, len) = make_test(input, Some("my_crate"), false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 1));
 }
 
@@ -322,7 +332,7 @@ io::stdin().read_line(&mut input)?;
 Ok::<(), io:Error>(())
 } _inner().unwrap() }"
         .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -336,7 +346,7 @@ fn main() { #[allow(non_snake_case)] fn _doctest_main__some_unique_name() {
 assert_eq!(2+2, 4);
 } _doctest_main__some_unique_name() }"
         .to_string();
-    let (output, len) = make_test(input, None, false, &opts, Some("_some_unique_name"));
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), Some("_some_unique_name"));
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -355,7 +365,7 @@ fn main() {
     eprintln!(\"hello anan\");
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }
 
@@ -375,7 +385,7 @@ fn main() {
     eprintln!(\"hello anan\");
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 1));
 }
 
@@ -400,7 +410,7 @@ fn main() {
 
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 
     // And same, if there is a `main` function provided by the user, we ensure that it's
@@ -420,7 +430,7 @@ fn main() {}";
 
 fn main() {}"
         .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 1));
 }
 
@@ -448,6 +458,6 @@ pub mod outer_module {
 }
 }"
     .to_string();
-    let (output, len) = make_test(input, None, false, &opts, None);
+    let (output, len) = make_test(input, None, false, &opts, Vec::new(), None);
     assert_eq!((output, len), (expected, 2));
 }

src/librustdoc/html/markdown.rs

@@ -300,7 +300,6 @@ impl<'a, I: Iterator<Item = Event<'a>>> Iterator for CodeBlocks<'_, 'a, I> {
                 crate_name: krate.map(String::from).unwrap_or_default(),
                 no_crate_inject: false,
                 insert_indent_space: true,
-                attrs: vec![],
                 args_file: PathBuf::new(),
             };
             let mut builder = doctest::BuildDocTestBuilder::new(&test).edition(edition);

tests/rustdoc-ui/doctest/dead-code-module-2.rs

@@ -0,0 +1,27 @@
+// Same test as dead-code-module but with 2 doc(test(attr())) at different levels.
+
+//@ edition: 2024
+//@ compile-flags:--test
+//@ normalize-stdout: "tests/rustdoc-ui/doctest" -> "$$DIR"
+//@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ failure-status: 101
+
+#![doc(test(attr(allow(unused_variables))))]
+
+mod my_mod {
+    #![doc(test(attr(deny(warnings))))]
+
+    /// Example
+    ///
+    /// ```rust,no_run
+    /// trait T { fn f(); }
+    /// ```
+    pub fn f() {}
+}
+
+/// Example
+///
+/// ```rust,no_run
+/// trait OnlyWarning { fn no_deny_warnings(); }
+/// ```
+pub fn g() {}

tests/rustdoc-ui/doctest/dead-code-module-2.stdout

@@ -0,0 +1,30 @@
+
+running 2 tests
+test $DIR/dead-code-module-2.rs - my_mod::f (line 16) - compile ... FAILED
+test $DIR/dead-code-module-2.rs - g (line 24) - compile ... ok
+
+failures:
+
+---- $DIR/dead-code-module-2.rs - my_mod::f (line 16) stdout ----
+error: trait `T` is never used
+  --> $DIR/dead-code-module-2.rs:17:7
+   |
+LL | trait T { fn f(); }
+   |       ^
+   |
+note: the lint level is defined here
+  --> $DIR/dead-code-module-2.rs:15:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(dead_code)]` implied by `#[deny(warnings)]`
+
+error: aborting due to 1 previous error
+
+Couldn't compile the test.
+
+failures:
+    $DIR/dead-code-module-2.rs - my_mod::f (line 16)
+
+test result: FAILED. 1 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+

tests/rustdoc-ui/doctest/dead-code-module.rs

@@ -0,0 +1,18 @@
+// Same test as dead-code but inside a module.
+
+//@ edition: 2024
+//@ compile-flags:--test
+//@ normalize-stdout: "tests/rustdoc-ui/doctest" -> "$$DIR"
+//@ normalize-stdout: "finished in \d+\.\d+s" -> "finished in $$TIME"
+//@ failure-status: 101
+
+mod my_mod {
+    #![doc(test(attr(allow(unused_variables), deny(warnings))))]
+
+    /// Example
+    ///
+    /// ```rust,no_run
+    /// trait T { fn f(); }
+    /// ```
+    pub fn f() {}
+}

tests/rustdoc-ui/doctest/dead-code-module.stdout

@@ -0,0 +1,29 @@
+
+running 1 test
+test $DIR/dead-code-module.rs - my_mod::f (line 14) - compile ... FAILED
+
+failures:
+
+---- $DIR/dead-code-module.rs - my_mod::f (line 14) stdout ----
+error: trait `T` is never used
+  --> $DIR/dead-code-module.rs:15:7
+   |
+LL | trait T { fn f(); }
+   |       ^
+   |
+note: the lint level is defined here
+  --> $DIR/dead-code-module.rs:13:9
+   |
+LL | #![deny(warnings)]
+   |         ^^^^^^^^
+   = note: `#[deny(dead_code)]` implied by `#[deny(warnings)]`
+
+error: aborting due to 1 previous error
+
+Couldn't compile the test.
+
+failures:
+    $DIR/dead-code-module.rs - my_mod::f (line 14)
+
+test result: FAILED. 0 passed; 1 failed; 0 ignored; 0 measured; 0 filtered out; finished in $TIME
+

tests/rustdoc-ui/doctest/doc-test-attr-pass-module.rs

@@ -0,0 +1,11 @@
+//@ check-pass
+
+#![crate_type = "lib"]
+#![deny(invalid_doc_attributes)]
+#![doc(test(no_crate_inject))]
+
+mod my_mod {
+    #![doc(test(attr(deny(warnings))))]
+
+    pub fn foo() {}
+}