Unfortunately, this is one of the missing features (for me) in SCSS today. The answer to this question is: there is no equivalent to SCSS . You must overwrite it using the SCSS-compliant method. Look, for example, at my correspondence in SCSS Twitter Bootstrap (uses the very example that you mentioned).
PS Do not use this plug, it is not supported right now, and you will probably be better off with the one mentioned on the official Twitter boot buffer wiki. ( more details )
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