DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Sass 4.0. Use call(get-function(bar)) instead.

    @return call(bar, $args...);
            ^^^^^^^^^^^^^^^^^^^
    spec/libsass-issues/issue_1634/input.scss 4:13  foo()
    spec/libsass-issues/issue_1634/input.scss 12:9  root stylesheet
