compiler: map[string]pointer, ?pointer, fix []pointer

vlib/builtin/array_test.v

@@ -4,7 +4,7 @@ const (
 )
 
 fn test_pointer() {
-	mut arr := []*int
+	mut arr := []&int
 	a := 1
 	b := 2
 	c := 3
@@ -14,6 +14,10 @@ fn test_pointer() {
 	assert *arr[0] == 1
 	arr[1] = &c
 	assert *arr[1] == 3
+	mut d_arr := [arr] // [][]&int
+	d_arr << arr
+	assert *d_arr[0][1] == 3
+	assert *d_arr[1][0] == 1
 }
 
 fn test_ints() {