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Fabrício Matté (2015-02-23T22:50:36.000Z)

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> 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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d at domenic.me (2015-03-06T00:42:50.908Z)

> 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.

Edit