return spans out of is_doc_comment to reduce reliance on .span() on attrs

compiler/rustc_ast/src/attr/mod.rs

@@ -86,10 +86,10 @@ impl AttributeExt for Attribute {
     /// Returns `true` if it is a sugared doc comment (`///` or `//!` for example).
     /// So `#[doc = "doc"]` (which is a doc comment) and `#[doc(...)]` (which is not
     /// a doc comment) will return `false`.
-    fn is_doc_comment(&self) -> bool {
+    fn is_doc_comment(&self) -> Option<Span> {
         match self.kind {
-            AttrKind::Normal(..) => false,
-            AttrKind::DocComment(..) => true,
+            AttrKind::Normal(..) => None,
+            AttrKind::DocComment(..) => Some(self.span),
         }
     }
 
@@ -776,7 +776,7 @@ pub trait AttributeExt: Debug {
     /// Returns `true` if it is a sugared doc comment (`///` or `//!` for example).
     /// So `#[doc = "doc"]` (which is a doc comment) and `#[doc(...)]` (which is not
     /// a doc comment) will return `false`.
-    fn is_doc_comment(&self) -> bool;
+    fn is_doc_comment(&self) -> Option<Span>;
 
     #[inline]
     fn has_name(&self, name: Symbol) -> bool {
@@ -863,8 +863,9 @@ impl Attribute {
         AttributeExt::path_matches(self, name)
     }
 
+    // on ast attributes we return a bool since that's what most code already expects
     pub fn is_doc_comment(&self) -> bool {
-        AttributeExt::is_doc_comment(self)
+        AttributeExt::is_doc_comment(self).is_some()
     }
 
     #[inline]

compiler/rustc_attr_parsing/src/attributes/util.rs

@@ -28,7 +28,8 @@ pub fn parse_version(s: Symbol) -> Option<RustcVersion> {
 }
 
 pub fn is_builtin_attr(attr: &impl AttributeExt) -> bool {
-    attr.is_doc_comment() || attr.ident().is_some_and(|ident| is_builtin_attr_name(ident.name))
+    attr.is_doc_comment().is_some()
+        || attr.ident().is_some_and(|ident| is_builtin_attr_name(ident.name))
 }
 
 pub fn is_doc_alias_attrs_contain_symbol<'tcx, T: AttributeExt + 'tcx>(

compiler/rustc_hir/src/hir.rs

@@ -1304,8 +1304,12 @@ impl AttributeExt for Attribute {
     }
 
     #[inline]
-    fn is_doc_comment(&self) -> bool {
-        matches!(self, Attribute::Parsed(AttributeKind::DocComment { .. }))
+    fn is_doc_comment(&self) -> Option<Span> {
+        if let Attribute::Parsed(AttributeKind::DocComment { span, .. }) = self {
+            Some(*span)
+        } else {
+            None
+        }
     }
 
     #[inline]
@@ -1425,7 +1429,7 @@ impl Attribute {
     }
 
     #[inline]
-    pub fn is_doc_comment(&self) -> bool {
+    pub fn is_doc_comment(&self) -> Option<Span> {
         AttributeExt::is_doc_comment(self)
     }
 

compiler/rustc_lint/src/builtin.rs

@@ -391,7 +391,7 @@ pub struct MissingDoc;
 impl_lint_pass!(MissingDoc => [MISSING_DOCS]);
 
 fn has_doc(attr: &hir::Attribute) -> bool {
-    if attr.is_doc_comment() {
+    if attr.is_doc_comment().is_some() {
         return true;
     }
 

compiler/rustc_query_system/src/ich/impls_syntax.rs

@@ -22,7 +22,7 @@ impl<'a> HashStable<StableHashingContext<'a>> for [hir::Attribute] {
         let filtered: SmallVec<[&hir::Attribute; 8]> = self
             .iter()
             .filter(|attr| {
-                !attr.is_doc_comment()
+                attr.is_doc_comment().is_none()
                     // FIXME(jdonszelmann) have a better way to handle ignored attrs
                     && !attr.ident().is_some_and(|ident| hcx.is_ignored_attr(ident.name))
             })

compiler/rustc_resolve/src/rustdoc.rs

@@ -214,8 +214,7 @@ pub fn attrs_to_doc_fragments<'a, A: AttributeExt + Clone + 'a>(
     for (attr, item_id) in attrs {
         if let Some((doc_str, comment_kind)) = attr.doc_str_and_comment_kind() {
             let doc = beautify_doc_string(doc_str, comment_kind);
-            let (span, kind, from_expansion) = if attr.is_doc_comment() {
-                let span = attr.span();
+            let (span, kind, from_expansion) = if let Some(span) = attr.is_doc_comment() {
                 (span, DocFragmentKind::SugaredDoc, span.from_expansion())
             } else {
                 let attr_span = attr.span();

src/librustdoc/clean/mod.rs

@@ -2719,7 +2719,7 @@ fn add_without_unwanted_attributes<'hir>(
     import_parent: Option<DefId>,
 ) {
     for attr in new_attrs {
-        if attr.is_doc_comment() {
+        if attr.is_doc_comment().is_some() {
             attrs.push((Cow::Borrowed(attr), import_parent));
             continue;
         }

src/librustdoc/passes/propagate_doc_cfg.rs

@@ -65,7 +65,7 @@ fn filter_non_cfg_tokens_from_list(args_tokens: &TokenStream) -> Vec<TokenTree>
 /// it and put them into `attrs`.
 fn add_only_cfg_attributes(attrs: &mut Vec<Attribute>, new_attrs: &[Attribute]) {
     for attr in new_attrs {
-        if attr.is_doc_comment() {
+        if attr.is_doc_comment().is_some() {
             continue;
         }
         let mut attr = attr.clone();

src/tools/clippy/clippy_lints/src/four_forward_slashes.rs

@@ -47,7 +47,7 @@ impl<'tcx> LateLintPass<'tcx> for FourForwardSlashes {
             .tcx
             .hir_attrs(item.hir_id())
             .iter()
-            .filter(|i| i.is_doc_comment())
+            .filter(|i| i.is_doc_comment().is_some())
             .fold(item.span.shrink_to_lo(), |span, attr| span.to(attr.span()));
         let (Some(file), _, _, end_line, _) = sm.span_to_location_info(span) else {
             return;

src/tools/clippy/clippy_lints/src/undocumented_unsafe_blocks.rs

@@ -475,7 +475,7 @@ fn block_has_safety_comment(cx: &LateContext<'_>, span: Span) -> bool {
 
 fn include_attrs_in_span(cx: &LateContext<'_>, hir_id: HirId, span: Span) -> Span {
     span.to(cx.tcx.hir_attrs(hir_id).iter().fold(span, |acc, attr| {
-        if attr.is_doc_comment() {
+        if attr.is_doc_comment().is_some() {
             return acc;
         }
         acc.to(attr.span())