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@mixin myblockquote { blockquote { @if global-variable-exists(blockquote-color) { background: $blockquote-color; } @else { background: lime; } @if mixin-exists(myblockquote) { color: red; } @else { color: blue; } @if variable-exists(foo) { float: left; } $foo: 1; @if variable-exists(foo) { float: right; } } } @include myblockquote;