Fixed Parser issues and simplified AST

test/hello.w12

@@ -1,16 +1,64 @@
 # Create an enum
 enum AnimalType {
-Dog,
-Cat,
+    Dog,
+    Cat,
 }
+
 # Create a struct
 struct Pet {
-name: [char], # A list of characters
-age: uint, # An unsigned 32-bit integer
-type: AnimalType,
-living: bool,
+    name: [char], # A list of characters
+    age: uint, # An unsigned 32-bit integer
+    type: AnimalType,
+    living: bool,
 }
+
 # Create a function that can be called on a Pet
 fn on Pet rename(newName: [char]) {
-    return "test";
+    self.name = newName;
+}
+
+# Create another struct
+struct Person {
+    pet: Pet,
+    name: [char],
+    age: uint,
+    living: bool,
+}
+
+fn on Person growUp() {
+    self.age += 1;
+}
+fn main() -> int {
+    # Create an instance of Pet
+    # "let" creates an immutable binding
+    var dog = Pet {
+        name: "Fido",
+        age: 3,
+        type: AnimalType.Dog,
+    };
+
+    # Create a (variable) instance of Person
+    # "var" creates a mutable binding
+    var person = Person {
+        pet: dog,
+        name: "Fred",
+        age: 41,
+    };
+
+    # Create a new name for the Pet
+    var new_name = "George";
+    person.pet.rename(new_name);
+
+    # Print out the person's name and age
+    # Uses C for I/O
+    printf("Person %s is %u years old.\n", person.name, person.age);
+    if person.age % 2 == 0 {
+        printf("Age is even\n");
+    } else {
+        printf("Age is odd\n");
+    }
+
+    *test[12](3);
+
+    return 0;
 }