$foo: (
  'foo': 'bar',
  'bar': (
    'foo': 'bze'
  )
);

.foo,
.bar {
  content: 'bar';

    content: 'baz';
content: 'bar';

  @include breakpoint(500) {
    content: 'baz';
  content: 'qux';
  }

    .qux {
      content: 'bar';
    }
}

@mixin bar {
    content: 'bar';
	content: 'baz';
}