Rollup merge of #119971 - compiler-errors:zip-eq, r=nnethercote

Use `zip_eq` to enforce that things being zipped have equal sizes

Some `zip`s are best enforced to be equal, since size mismatches suggest deeper bugs in the compiler.

compiler/rustc_ty_utils/src/layout.rs

@@ -1052,6 +1052,8 @@ fn variant_info_for_coroutine<'tcx>(
     def_id: DefId,
     args: ty::GenericArgsRef<'tcx>,
 ) -> (Vec<VariantInfo>, Option<Size>) {
+    use itertools::Itertools;
+
     let Variants::Multiple { tag, ref tag_encoding, tag_field, .. } = layout.variants else {
         return (vec![], None);
     };
@@ -1064,7 +1066,7 @@ fn variant_info_for_coroutine<'tcx>(
         .as_coroutine()
         .upvar_tys()
         .iter()
-        .zip(upvar_names)
+        .zip_eq(upvar_names)
         .enumerate()
         .map(|(field_idx, (_, name))| {
             let field_layout = layout.field(cx, field_idx);