Move `name` field from `AssocItem` to `AssocKind` variants.

To accurately reflect that RPITIT assoc items don't have a name. This
avoids the use of `kw::Empty` to mean "no name", which is error prone.

Helps with #137978.

1 files changed, 3 insertions, 2 deletions

diff --git a/compiler/rustc_resolve/src/late/diagnostics.rs b/compiler/rustc_resolve/src/late/diagnostics.rs
index ae81021e0be..d4fe446cc9f 100644
--- a/compiler/rustc_resolve/src/late/diagnostics.rs
+++ b/compiler/rustc_resolve/src/late/diagnostics.rs
@@ -2007,8 +2007,9 @@ impl<'ast, 'ra: 'ast, 'tcx> LateResolutionVisitor<'_, 'ast, 'ra, 'tcx> {
                 if def.did() != def_id {
                     return None;
                 }
-                let order = !item.name.as_str().starts_with("new");
-                Some((order, item.name, input_len))
+                let name = item.name();
+                let order = !name.as_str().starts_with("new");
+                Some((order, name, input_len))
             })
             .collect::<Vec<_>>();
         items.sort_by_key(|(order, _, _)| *order);