FINALLY fixed an error that took weeks. Turned out that the ParseRule was shallow copied, and the lookahead was not copied correctly. So it got extended and thus skipped over the state when it should have been redone.

include/ASTData.h

@@ -12,7 +12,7 @@
 enum ASTType {undef, translation_unit, interpreter_directive, import, identifier,
 	function, code_block,
 	typed_parameter, expression, boolean_expression, statement,
-	if_statement, return_statement, assignment_statement, declaration_statement,
+	if_statement, while_loop, for_loop, return_statement, assignment_statement, declaration_statement,
 	function_call, value};
 enum ValueType {none, boolean, integer, floating, double_percision, char_string };