@mixin __rules($rules: ()) {
    @if not __is-map($rules)
    or not __every($rules, '__is-map') {
        @error 'Rules for _rules mixin must be key-value pairs, where value is a declaration map.';
    } @else {
        @each $selector, $declarations in $rules {
            #{$selector} {
                @include __declare($declarations);
            }
        }
    }

    @content;
}


///
/// Includes a ruleset for each selector-declarations pair in the map.
/// 
/// 
/// @access public
/// @group Map
/// @param {Map} $rules [()] The rules map.
/// @output The rulesets for each selector key.
/// @example scss
/// $test-rules: (
///     '.foo': (
///         'height': 50px,
///         'padding': 1rem 5rem
///     ),
///     '.bar .baz': (
///         'width': 50px,
///         'margin': 2rem 6rem
///     )
/// );
/// 
/// @include _rules($test-rules);
/// 
/// // Output CSS:
/// .foo {
///     height: 50px;
///     padding: 1rem 5rem;
/// }
/// 
/// .bar .baz {
///     width: 50px;
///     margin: 2rem 6rem;
/// }

@mixin _rules($args...) {
    @include __rules($args...);
}