test rand a bit more

test-cargo-miri/tests/test.rs

@@ -11,19 +11,25 @@ fn simple() {
 fn fixed_rng() {
     let mut rng = rand::rngs::StdRng::seed_from_u64(0xdeadcafe);
     let x: u32 = rng.gen();
-    let y: u32 = rng.gen();
-    assert_ne!(x, y);
+    let y: usize = rng.gen();
+    let z: u128 = rng.gen();
+    assert_ne!(x as usize, y);
+    assert_ne!(y as u128, z);
 }
 
 #[test]
 fn entropy_rng() {
     // Use this opportunity to test querying the RNG (needs an external crate, hence tested here and not in the compiletest suite)
     let mut rng = SmallRng::from_entropy();
     let _val = rng.gen::<i32>();
+    let _val = rng.gen::<isize>();
+    let _val = rng.gen::<i128>();
 
     // Also try per-thread RNG.
     let mut rng = rand::thread_rng();
     let _val = rng.gen::<i32>();
+    let _val = rng.gen::<isize>();
+    let _val = rng.gen::<i128>();
 }
 
 // A test that won't work on miri