feat: add support for type declarations on pointer types

gnovm/pkg/gnolang/op_types.go

@@ -485,7 +485,7 @@ func (m *Machine) doOpStaticTypeOf() {
 		m.PushOp(OpStaticTypeOf)
 		m.Run() // XXX replace
 		xt := m.ReapValues(start)[0].GetType()
-		if pt, ok := xt.(*PointerType); ok {
+		if pt, ok := baseOf(xt).(*PointerType); ok {
 			m.PushValue(asValue(pt.Elt))
 		} else if _, ok := xt.(*TypeType); ok {
 			m.PushValue(asValue(gTypeType))

gnovm/pkg/gnolang/preprocess.go

@@ -3096,6 +3096,8 @@ func tryPredefine(store Store, last BlockNode, d Decl) (un Name) {
 				t = &MapType{}
 			case *StructTypeExpr:
 				t = &StructType{}
+			case *StarExpr:
+				t = &PointerType{}
 			case *NameExpr:
 				if tv := last.GetValueRef(store, tx.Name); tv != nil {
 					// (file) block name

gnovm/tests/files/type33.gno

@@ -0,0 +1,28 @@
+package main
+
+import "fmt"
+
+// Define a base type
+type Base int
+
+// Declare a new type that is a pointer to the base type
+type PtrToBase *Base
+
+func main() {
+	var b Base = 42      // Initialize a variable of the base type
+	var p PtrToBase = &b // Initialize a variable of the new pointer type with the address of b
+
+	fmt.Printf("The value of b is: %d\n", b)
+
+	// Using the new pointer type
+	fmt.Printf("The value pointed to by p is: %d\n", *p)
+
+	// Modifying the value pointed to by p
+	*p = 100
+	fmt.Printf("The new value of b after modification through p is: %d\n", b)
+}
+
+// Output:
+// The value of b is: 42
+// The value pointed to by p is: 42
+// The new value of b after modification through p is: 100