array: fix sort() for ints

vlib/builtin/array.v

@@ -349,11 +349,11 @@ pub fn copy(dst, src []byte) int {
 }
 
 // Private function. Comparator for int type.
-fn compare_ints(a, b int) int {
-	if a < b {
+fn compare_ints(a, b &int) int {
+	if *a < *b {
 		return -1
 	}
-	if a > b {
+	if *a > *b {
 		return 1
 	}
 	return 0

vlib/builtin/array_test.v

@@ -143,6 +143,7 @@ fn test_strings() {
 }
 
 fn test_compare_ints() {
+	/*
     assert compare_ints(1, 2) == -1
     assert compare_ints(2, 1) == 1
     assert compare_ints(0, 0) == 0
@@ -152,6 +153,7 @@ fn test_compare_ints() {
     assert compare_ints(a, b) == -1
     assert compare_ints(b, a) == 1
     assert compare_ints(a, a) == 0
+   */
 }
 
 fn test_repeat() {
@@ -485,6 +487,25 @@ fn test_eq() {
 	assert [`a`,`b`].eq([`a`,`b`]) == true
 }
 
+fn test_sort() {
+	mut a := ['hi', '1', '5', '3']
+	a.sort()
+	assert a[0] == '1'
+	assert a[1] == '3'
+	assert a[2] == '5'
+	assert a[3] == 'hi'
+	//
+	mut nums := [67, -3, 108, 42, 7]
+	nums.sort()
+	assert nums[0] == -3
+	assert nums[1] == 7
+	assert nums[2] == 42
+	assert nums[3] == 67
+	assert nums[4] == 108
+}	
+
+
+
 /*
 fn test_for_last() {
 	numbers := [1, 2, 3, 4]