> It's establishing the precedence of the MixinExpression between PostfixExpression and LeftHandSideExpression.
Thanks Kevin, I thought it could be the case, but I still can't see when that is relevant -- as far as I can see, the resulting value of a mixinExpression is always an object (or a constructor object), and those would be invalid LHS expressions in regard to the `++`/`--` postfix operations. I assume that BNF grammar is only necessary to establish the precedence order for expressions that will ultimately throw an error, no? I feel I'm missing something. /fm
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