feat: ast structure and utilities

src/main.zig

@@ -58,7 +58,12 @@ fn mainArgs(
         };
     };
 
-    var story = try ink.Story.loadFromString(gpa, source_bytes, .{});
+    const stdout = std.fs.File.stdout();
+    var stdout_writer = stdout.writer(&stdout_buffer);
+
+    var story = try ink.Story.loadFromString(gpa, source_bytes, .{
+        .stream_writer = &stdout_writer.interface,
+    });
     defer story.deinit();
 }