Library can now construct into AST and serialization itself (singleheader).

Still need to validate if they match.

project/components/header_end.hpp

@@ -57,6 +57,9 @@ extern CodeAttributes attrib_api_import;
 extern Code module_global_fragment;
 extern Code module_private_fragment;
 
+// Exposed, but this is really used for parsing.
+extern Code fmt_newline;
+
 extern CodePragma pragma_once;
 
 extern CodeParam param_varadic;