| rhs symbol named_ref.opt
{ grammar_current_rule_symbol_append ($2, @2, $3); }
| rhs "{...}" named_ref.opt
{ grammar_current_rule_action_append ($2, @2, $3, false); }
| rhs symbol named_ref.opt
{ grammar_current_rule_symbol_append ($2, @2, $3); }
| rhs "{...}" named_ref.opt
{ grammar_current_rule_action_append ($2, @2, $3, false); }