fix(gnovm): handle type alias declaration for PrimitiveType

gnovm/pkg/gnolang/preprocess.go

@@ -2352,6 +2352,10 @@ func preprocess1(store Store, ctx BlockNode, n Node) Node {
 						// }
 						*dst = *dt2
 					}
+				case PrimitiveType:
+					dst = tmp.(PrimitiveType)
+				case *PointerType:
+					*dst = *(tmp.(*PointerType))
 				default:
 					panic(fmt.Sprintf("unexpected type declaration type %v",
 						reflect.TypeOf(dst)))
@@ -4283,9 +4287,6 @@ func tryPredefine(store Store, last BlockNode, d Decl) (un Name) {
 							// predefineNow preprocessed dependent types.
 							panic("should not happen")
 						}
-					} else {
-						// all names are declared types.
-						panic("should not happen")
 					}
 				} else if idx, ok := UverseNode().GetLocalIndex(tx.Name); ok {
 					// uverse name

gnovm/tests/files/type40.gno

@@ -0,0 +1,46 @@
+package main
+
+type (
+	// PrimitiveType
+	Number  = int32
+	Number2 = Number
+
+	// PointerType
+	Pointer = *int32
+	Pointer2 = Pointer
+
+	// Interface
+	Interface = interface{}
+	Interface2 = Interface
+
+	// S
+	Struct = struct{Name string}
+	Struct2 = Struct
+)
+
+func fNumber(n Number) { println(n) }
+func fPointer(p Pointer) { println(*p) }
+func fInterface(i Interface) { println(i) }
+func fStruct(s Struct) { println(s.Name) }
+
+func main() {
+	var n Number2 = 5
+	fNumber(n)
+
+	var num int32 = 6
+	var p Pointer2 = &num
+	fPointer(p)
+
+	var i Interface2
+	i = 7
+	fInterface(i)
+
+	var s Struct2 = Struct2{Name: "yo"}
+	fStruct(s)
+}
+
+// Output:
+// 5
+// 6
+// 7
+// yo