|| (key_->name.length() == 6 && key_->name.substr(0, 4) == "text"))
features.require("amstext");
if (key_->name == "mathscr")
|| (key_->name.length() == 6 && key_->name.substr(0, 4) == "text"))
features.require("amstext");
if (key_->name == "mathscr")