Rollup merge of #100005 - GuillaumeGomez:cleanup-ast-attr-clean, r=notriddle

Remove Clean trait for ast::Attribute and improve Attributes::from_ast

I prefer to keep this commit on its own for this PR because I'm changing a bit more things than expected originally: I split `Attributes::from_ast` into two because there is only one location making use of its second parameter.

Follow-up of https://github.com/rust-lang/rust/pull/99638.

r? `@notriddle`

src/librustdoc/clean/inline.rs

@@ -304,14 +304,14 @@ fn merge_attrs(
         both.extend_from_slice(old_attrs);
         (
             if let Some(new_id) = parent_module {
-                Attributes::from_ast(old_attrs, Some((inner, new_id)))
+                Attributes::from_ast_with_additional(old_attrs, (inner, new_id))
             } else {
-                Attributes::from_ast(&both, None)
+                Attributes::from_ast(&both)
             },
             both.cfg(cx.tcx, &cx.cache.hidden_cfg),
         )
     } else {
-        (old_attrs.clean(cx), old_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg))
+        (Attributes::from_ast(&old_attrs), old_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg))
     }
 }
 

src/librustdoc/clean/mod.rs

@@ -121,12 +121,6 @@ impl<'tcx> Clean<'tcx, Item> for DocModule<'tcx> {
     }
 }
 
-impl<'tcx> Clean<'tcx, Attributes> for [ast::Attribute] {
-    fn clean(&self, _cx: &mut DocContext<'_>) -> Attributes {
-        Attributes::from_ast(self, None)
-    }
-}
-
 impl<'tcx> Clean<'tcx, Option<GenericBound>> for hir::GenericBound<'tcx> {
     fn clean(&self, cx: &mut DocContext<'tcx>) -> Option<GenericBound> {
         Some(match *self {
@@ -2096,7 +2090,7 @@ fn clean_extern_crate<'tcx>(
     // FIXME: using `from_def_id_and_kind` breaks `rustdoc/masked` for some reason
     vec![Item {
         name: Some(name),
-        attrs: Box::new(attrs.clean(cx)),
+        attrs: Box::new(Attributes::from_ast(attrs)),
         item_id: crate_def_id.into(),
         visibility: clean_visibility(ty_vis),
         kind: Box::new(ExternCrateItem { src: orig_name }),

src/librustdoc/clean/types.rs

@@ -34,10 +34,10 @@ use rustc_target::spec::abi::Abi;
 use rustc_typeck::check::intrinsic::intrinsic_operation_unsafety;
 
 use crate::clean::cfg::Cfg;
+use crate::clean::clean_visibility;
 use crate::clean::external_path;
 use crate::clean::inline::{self, print_inlined_const};
 use crate::clean::utils::{is_literal_expr, print_const_expr, print_evaluated_const};
-use crate::clean::{clean_visibility, Clean};
 use crate::core::DocContext;
 use crate::formats::cache::Cache;
 use crate::formats::item_type::ItemType;
@@ -469,7 +469,7 @@ impl Item {
             def_id,
             name,
             kind,
-            Box::new(ast_attrs.clean(cx)),
+            Box::new(Attributes::from_ast(ast_attrs)),
             cx,
             ast_attrs.cfg(cx.tcx, &cx.cache.hidden_cfg),
         )
@@ -1161,14 +1161,16 @@ impl Attributes {
         false
     }
 
-    pub(crate) fn from_ast(
+    pub(crate) fn from_ast(attrs: &[ast::Attribute]) -> Attributes {
+        Attributes::from_ast_iter(attrs.iter().map(|attr| (attr, None)), false)
+    }
+
+    pub(crate) fn from_ast_with_additional(
         attrs: &[ast::Attribute],
-        additional_attrs: Option<(&[ast::Attribute], DefId)>,
+        (additional_attrs, def_id): (&[ast::Attribute], DefId),
     ) -> Attributes {
         // Additional documentation should be shown before the original documentation.
-        let attrs1 = additional_attrs
+        let attrs1 = additional_attrs.iter().map(|attr| (attr, Some(def_id)));
-            .into_iter()
-            .flat_map(|(attrs, def_id)| attrs.iter().map(move |attr| (attr, Some(def_id))));
         let attrs2 = attrs.iter().map(|attr| (attr, None));
         Attributes::from_ast_iter(attrs1.chain(attrs2), false)
     }

src/librustdoc/doctest.rs

@@ -1222,7 +1222,7 @@ impl<'a, 'hir, 'tcx> HirCollector<'a, 'hir, 'tcx> {
 
         // The collapse-docs pass won't combine sugared/raw doc attributes, or included files with
         // anything else, this will combine them for us.
-        let attrs = Attributes::from_ast(ast_attrs, None);
+        let attrs = Attributes::from_ast(ast_attrs);
         if let Some(doc) = attrs.collapsed_doc_value() {
             // Use the outermost invocation, so that doctest names come from where the docs were written.
             let span = ast_attrs

src/librustdoc/html/render/print_item.rs

@@ -345,7 +345,7 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
             clean::ImportItem(ref import) => {
                 let (stab, stab_tags) = if let Some(import_def_id) = import.source.did {
                     let ast_attrs = cx.tcx().get_attrs_unchecked(import_def_id);
-                    let import_attrs = Box::new(clean::Attributes::from_ast(ast_attrs, None));
+                    let import_attrs = Box::new(clean::Attributes::from_ast(ast_attrs));
 
                     // Just need an item with the correct def_id and attrs
                     let import_item = clean::Item {