Use expect_{use,fn} in a couple of places

Author: WaffleLapkin

compiler/rustc_hir_analysis/src/check/compare_impl_item.rs

@@ -1504,7 +1504,7 @@ fn compare_synthetic_generics<'tcx>(
                     let _: Option<_> = try {
                         let impl_m = impl_m.def_id.as_local()?;
                         let impl_m = tcx.hir().expect_impl_item(impl_m);
-                        let hir::ImplItemKind::Fn(sig, _) = &impl_m.kind else { unreachable!() };
+                        let (sig, _) = impl_m.expect_fn();
                         let input_tys = sig.decl.inputs;
 
                         struct Visitor(Option<Span>, hir::def_id::LocalDefId);

compiler/rustc_hir_analysis/src/check_unused.rs

@@ -29,7 +29,7 @@ pub fn check_crate(tcx: TyCtxt<'_>) {
         if item.span.is_dummy() {
             continue;
         }
-        let hir::ItemKind::Use(path, _) = item.kind else { unreachable!() };
+        let (path, _) = item.expect_use();
         let msg = if let Ok(snippet) = tcx.sess.source_map().span_to_snippet(path.span) {
             format!("unused import: `{}`", snippet)
         } else {