a little bit of cleanup

src/parser/parser.hpp

@@ -2,12 +2,15 @@
 
 #include "ast/ast.hpp"
 #include "ast/errors/error.hpp"
+#include "ast/program.hpp"
 #include "ast/statements/expression.hpp"
 #include "ast/statements/let.hpp"
 #include "ast/statements/return.hpp"
 #include "lexer/lexer.hpp"
 #include "token/token.hpp"
 
+#include <vector>
+
 namespace parser {
     struct parser {
         parser(lexer::lexer& lexer);