Implemented loop iterators

tests/programs/array-index-dynamic.q

@@ -1,23 +0,0 @@
-import mem
-
-main() {
-	a := mem.alloc(4)
-	i := 0
-
-	a[i] = i * 2
-	i += 1
-	a[i] = i * 2
-	i += 1
-	a[i] = i * 2
-	i += 1
-	a[i] = i * 2
-
-	i = 0
-	assert a[i] == i * 2
-	i += 1
-	assert a[i] == i * 2
-	i += 1
-	assert a[i] == i * 2
-	i += 1
-	assert a[i] == i * 2
-}

tests/programs/index-dynamic.q

@@ -0,0 +1,10 @@
+import mem
+
+main() {
+	a := mem.alloc(4)
+
+	loop i := 0..4 {
+		a[i] = i * 2
+		assert a[i] == i * 2
+	}
+}

tests/programs/loop-limited.q

@@ -0,0 +1,6 @@
+main() {
+	loop i := 0..10 {
+		assert i >= 0
+		assert i < 10
+	}
+}