Rollup merge of #113091 - GuillaumeGomez:prevent-cfg-merge-reexport, r=rustdoc

Don't merge cfg and doc(cfg) attributes for re-exports

Fixes #112881.

## Explanations

When re-exporting things with different `cfg`s there are two things that can happen:

 * The re-export uses a subset of `cfg`s, this subset is sufficient so that the item will appear exactly with the subset
 * The re-export uses a non-subset of `cfg`s (e.g. like the example I posted just above where the re-export is ungated), if the non-subset `cfg`s are active (e.g. compiling that example on windows) then this will be a compile error as the item doesn't exist to re-export, if the subset `cfg`s are active it behaves like 1.

### Glob re-exports?

**This only applies to non-glob inlined re-exports.** For glob re-exports the item may or may not exist to be re-exported (potentially the `cfg`s on the path up until the glob can be removed, and only `cfg`s on the globbed item itself matter), for non-inlined re-exports see https://github.com/rust-lang/rust/issues/85043.

cc `@Nemo157`
r? `@notriddle`

1 files changed, 2 insertions, 11 deletions

diff --git a/src/librustdoc/html/render/print_item.rs b/src/librustdoc/html/render/print_item.rs
index ff7ce01e807..5ca623f01f1 100644
--- a/src/librustdoc/html/render/print_item.rs
+++ b/src/librustdoc/html/render/print_item.rs
@@ -1,5 +1,3 @@
-use clean::AttributesExt;
-
 use rustc_data_structures::captures::Captures;
 use rustc_data_structures::fx::{FxHashMap, FxHashSet};
 use rustc_hir as hir;
@@ -465,16 +463,9 @@ fn item_module(w: &mut Buffer, cx: &mut Context<'_>, item: &clean::Item, items:
 
             clean::ImportItem(ref import) => {
                 let stab_tags = if let Some(import_def_id) = import.source.did {
-                    let ast_attrs = tcx.get_attrs_unchecked(import_def_id);
-                    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 {
-                        item_id: import_def_id.into(),
-                        attrs: import_attrs,
-                        cfg: ast_attrs.cfg(tcx, &cx.cache().hidden_cfg),
-                        ..myitem.clone()
-                    };
+                    let import_item =
+                        clean::Item { item_id: import_def_id.into(), ..myitem.clone() };
 
                     let stab_tags = Some(extra_info_tags(&import_item, item, tcx).to_string());
                     stab_tags