feat: Nullable variable have null default value

CHANGELOG.md

@@ -41,6 +41,7 @@
 - Changed pattern delimiters (https://github.com/buzz-language/buzz/issues/165)
 - `list.append` does not return the appended value anymore
 - Generic types syntax changed from `myFunction(<K,V>, ...)` to `myFunction::<K,V>(...)`
+- Nullable object fields and nullable variables have a `null` initial value if none is provided
 
 ## Fixed
 

src/parser.zig

@@ -2579,8 +2579,15 @@ pub const Parser = struct {
         var value: ?*ParseNode = null;
 
         if (should_assign) {
-            try self.consume(.Equal, "Expected variable initial value");
-            value = try self.expression(false);
+            if (try self.match(.Equal)) {
+                value = try self.expression(false);
+            } else if (parsed_type == null or !parsed_type.?.optional) {
+                self.reporter.reportErrorAt(
+                    .syntax,
+                    self.parser.previous_token.?,
+                    "Expected variable initial value",
+                );
+            }
         }
 
         if (var_type.def_type == .Placeholder and value != null and value.?.type_def != null and value.?.type_def.?.def_type == .Placeholder) {

tests/063-nullable-default.buzz

@@ -0,0 +1,20 @@
+import "std";
+
+object Person {
+    str name,
+    int? age,
+}
+
+test "Nullable object field has a default value at null" {
+    Person person = Person{
+        name = "Joe"
+    };
+
+    assert(person.age == null, message: "Nullable object field has a default value at null");
+}
+
+test "Nullable variable has a default value at null" {
+    str? hello;
+
+    assert(hello == null, message: "Nullable variable has default value at null");
+}