rustdoc: skip `MetaSized` bounds

These should never be shown to users at the moment.

1 files changed, 18 insertions, 1 deletions

diff --git a/src/librustdoc/clean/mod.rs b/src/librustdoc/clean/mod.rs
index db4bcdaeb6c..d77bdf09d01 100644
--- a/src/librustdoc/clean/mod.rs
+++ b/src/librustdoc/clean/mod.rs
@@ -39,9 +39,9 @@ use rustc_ast::tokenstream::{TokenStream, TokenTree};
 use rustc_data_structures::fx::{FxHashMap, FxHashSet, FxIndexMap, FxIndexSet, IndexEntry};
 use rustc_errors::codes::*;
 use rustc_errors::{FatalError, struct_span_code_err};
-use rustc_hir::PredicateOrigin;
 use rustc_hir::def::{CtorKind, DefKind, Res};
 use rustc_hir::def_id::{DefId, DefIdMap, DefIdSet, LOCAL_CRATE, LocalDefId};
+use rustc_hir::{LangItem, PredicateOrigin};
 use rustc_hir_analysis::hir_ty_lowering::FeedConstTy;
 use rustc_hir_analysis::{lower_const_arg_for_rustdoc, lower_ty};
 use rustc_middle::metadata::Reexport;
@@ -886,6 +886,10 @@ fn clean_ty_generics_inner<'tcx>(
             if b.is_sized_bound(cx) {
                 has_sized = true;
                 false
+            } else if b.is_meta_sized_bound(cx) {
+                // FIXME(sized-hierarchy): Always skip `MetaSized` bounds so that only `?Sized`
+                // is shown and none of the new sizedness traits leak into documentation.
+                false
             } else {
                 true
             }
@@ -1448,6 +1452,13 @@ pub(crate) fn clean_middle_assoc_item(assoc_item: &ty::AssocItem, cx: &mut DocCo
                     }
                     _ => true,
                 });
+
+                bounds.retain(|b| {
+                    // FIXME(sized-hierarchy): Always skip `MetaSized` bounds so that only `?Sized`
+                    // is shown and none of the new sizedness traits leak into documentation.
+                    !b.is_meta_sized_bound(cx)
+                });
+
                 // Our Sized/?Sized bound didn't get handled when creating the generics
                 // because we didn't actually get our whole set of bounds until just now
                 // (some of them may have come from the trait). If we do have a sized
@@ -2276,6 +2287,12 @@ fn clean_middle_opaque_bounds<'tcx>(
                 _ => return None,
             };
 
+            // FIXME(sized-hierarchy): Always skip `MetaSized` bounds so that only `?Sized`
+            // is shown and none of the new sizedness traits leak into documentation.
+            if cx.tcx.is_lang_item(trait_ref.def_id(), LangItem::MetaSized) {
+                return None;
+            }
+
             if let Some(sized) = cx.tcx.lang_items().sized_trait()
                 && trait_ref.def_id() == sized
             {