<% impl_status dart: true, libsass: '3.5.0', ruby: '3.5.0', feature: 'Argument Type' do %> In older versions of LibSass and Ruby Sass, the [`call()` function][] took a string representing a function's name. This was changed to take a function value instead in preparation for a new module system where functions are no longer global and so a given name may not always refer to the same function. [`call()` function]: /documentation/modules/meta#call Passing a string to `call()` still works in all implementations, but it's deprecated and will be disallowed in future versions. <% end %>