Revert "array: fix and document array functions"

This reverts commit 7fa33fc250.

vlib/builtin/array_test.v

@@ -32,10 +32,6 @@ fn test_deleting() {
 	a.delete(1)
 	assert a.str() == '[5, 3, 4]'
 	assert a.len == 3
-
-    a.delete(a.len - 1)
-	assert a.str() == '[5, 3]'
-	assert a.len == 2
 }
 
 fn test_short() {
@@ -84,115 +80,37 @@ fn test_push() {
 	assert a.str() == '[1, 3]'
 }
 
-// TODO array.insert is broken
-// Cannot pass literal or primitive type as it cannot be cast to voidptr.
-// In the current state only that would work:
-//   i := 3
-//	 a.insert(0, &i)
-// ----------------------------
-// fn test_insert() {
-//     mut a := [1, 2]
-
-//     a.insert(0, 3)
-//     assert a[0] == 3
-//     assert a[2] == 2
-//     assert a.len == 3
-
-//     a.insert(1, 4)
-//     assert a[1] == 4
-//     assert a[2] == 1
-//     assert a.len == 4
-
-//     a.insert(4, 5)
-//     assert a[4] == 5
-//     assert a[3] == 2
-//     assert a.len == 5
-
-//     mut b := []f64
-//     assert b.len == 0
-//     b.insert(0, f64(1.1))
-//     assert b.len == 1
-//     assert b[0] == f64(1.1)
-// }
-
-// TODO array.prepend is broken
-// It depends on array.insert
-// -----------------------------
-// fn test_prepend() {
-//     mut a := []int
-//     assert a.len == 0
-//     a.prepend(1)
-//     assert a.len == 1
-//     assert a[0] == 1
-
-//     mut b := []f64
-//     assert b.len == 0
-//     b.prepend(f64(1.1))
-//     assert b.len == 1
-//     assert b[0] == f64(1.1)
-// }
-
 fn test_strings() {
 	a := ['a', 'b', 'c']
 	assert a.str() == '["a", "b", "c"]'
 }
 
-fn test_compare_ints() {
-    assert compare_ints(1, 2) == -1
-    assert compare_ints(2, 1) == 1
-    assert compare_ints(0, 0) == 0
-
-    a := 1
-    b := 2
-    assert compare_ints(a, b) == -1
-    assert compare_ints(b, a) == 1
-    assert compare_ints(a, a) == 0
-}
-
 fn test_repeat() {
+	a := [0].repeat(5)
+	assert a.len == 5
+	assert a[0] == 0 && a[1] == 0 && a[2] == 0 && a[3] == 0 && a[4] == 0
+
+	b := [7].repeat(3)
+	assert b.len == 3
+	assert b[0] == 7 && b[1] == 7 && b[2] == 7
 	{
-		a := [0].repeat(5)
-		assert a.len == 5
-		assert a[0] == 0 && a[1] == 0 && a[2] == 0 && a[3] == 0 && a[4] == 0
-	}
-	{
-		a := [1.1].repeat(10)
+		mut aa := [1.1].repeat(10)
 		// FIXME: assert aa[0] == 1.1 will fail, need fix
-		assert a[0] == f32(1.1)
-		assert a[5] == f32(1.1)
-		assert a[9] == f32(1.1)
+		assert aa[0] == f32(1.1)
+		assert aa[5] == f32(1.1)
+		assert aa[9] == f32(1.1)
 	}
 	{
-		a := [f32(1.1)].repeat(10)
-		assert a[0] == f32(1.1)
-		assert a[5] == f32(1.1)
-		assert a[9] == f32(1.1)
+		mut aa := [f32(1.1)].repeat(10)
+		assert aa[0] == f32(1.1)
+		assert aa[5] == f32(1.1)
+		assert aa[9] == f32(1.1)
 	}
 	{
-		a := [f64(1.1)].repeat(10)
-		assert a[0] == f64(1.1)
-		assert a[5] == f64(1.1)
-		assert a[9] == f64(1.1)
-	}
-	{
-		a := [1, 2].repeat(2)
-		assert a[0] == 1
-		assert a[1] == 2
-		assert a[2] == 1
-		assert a[3] == 2
-	}
-	{
-		a := ['1', 'abc'].repeat(2)
-		assert a[0] == '1'
-		assert a[1] == 'abc'
-		assert a[2] == '1'
-		assert a[3] == 'abc'
-	}
-	{
-		mut a := ['1', 'abc'].repeat(0)
-		assert a.len == 0
-		a << 'abc'
-		assert a[0] == 'abc'
+		aa := [f64(1.1)].repeat(10)
+		assert aa[0] == f64(1.1)
+		assert aa[5] == f64(1.1)
+		assert aa[9] == f64(1.1)
 	}
 }
 
@@ -231,16 +149,12 @@ fn test_left() {
 	b := a.left(2)
 	c := a[0..2]
 	d := a[..2]
-    e := a.left(4)
 	assert b[0] == 1
 	assert b[1] == 2
 	assert c[0] == 1
 	assert c[1] == 2
 	assert d[0] == 1
 	assert d[1] == 2
-    assert e[0] == 1
-    assert e[2] == 3
-    assert e.len == 3
 }
 
 fn test_slice() {