|| ly_symbol2scm ("push") == tag
|| ly_symbol2scm ("assign") == tag
|| ly_symbol2scm ("unset") == tag)
property_ops_ = scm_cons (mod, property_ops_);
else if (ly_symbol2scm ("alias") == tag)
context_aliases_ = scm_cons (sym, context_aliases_);
|| ly_symbol2scm ("push") == tag
|| ly_symbol2scm ("assign") == tag
|| ly_symbol2scm ("unset") == tag)
property_ops_ = scm_cons (mod, property_ops_);
else if (ly_symbol2scm ("alias") == tag)
context_aliases_ = scm_cons (sym, context_aliases_);