Fix test

Author: termoshtt

tests/diag.rs

@@ -10,15 +10,15 @@ use ndarray_linalg::*;
 fn diag_1d() {
     let d = arr1(&[1.0, 2.0]);
     let v = arr1(&[1.0, 1.0]);
-    let dv = d.into_diagonal().op(v);
+    let dv = d.into_diagonal().op(&v);
     assert_close_l2!(&dv, &arr1(&[1.0, 2.0]), 1e-7);
 }
 
 #[test]
 fn diag_2d() {
     let d = arr1(&[1.0, 2.0]);
     let m = arr2(&[[1.0, 1.0], [1.0, 1.0]]);
-    let dm = d.into_diagonal().op(m);
+    let dm = d.into_diagonal().op(&m);
     println!("dm = {:?}", dm);
     assert_close_l2!(&dm, &arr2(&[[1.0, 1.0], [2.0, 2.0]]), 1e-7);
 }