arrays: use for/in instead of unsafe [direct_array_access] (#8857)

vlib/arrays/arrays_test.v

@@ -1,7 +1,5 @@
 module arrays
 
-import rand
-
 fn test_min() {
 	a := [8, 2, 6, 4]
 	assert min<int>(a) == 2
@@ -54,24 +52,3 @@ fn test_merge() {
 	assert merge<int>(a, c) == a
 	assert merge<int>(d, b) == b
 }
-
-fn test_fixed_array_assignment() {
-	mut a := [2]int{}
-	a[0] = 111
-	a[1] = 222
-	b := a
-	assert b[0] == a[0]
-	assert b[1] == a[1]
-	mut c := [2]int{}
-	c = a
-	assert c[0] == a[0]
-	assert c[1] == a[1]
-	d := [3]int{init: 333}
-	for val in d {
-		assert val == 333
-	}
-	e := [3]string{init: 'vlang'}
-	for val in e {
-		assert val == 'vlang'
-	}
-}