Kevin Smith (2015-02-23T22:30:46.000Z)
> ```
> PostfixExpression :
>     [...]
>     MixinExpression [no LineTerminator here] ++
>     MixinExpression [no LineTerminator here] --
> ```
>
> Is this a typo? What is the point of the `++`/`--` postfix operators after
> a `MixinExpression`?
>

It's establishing the precedence of the MixinExpression between
PostfixExpression and LeftHandSideExpression.
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d at domenic.me (2015-03-06T00:42:42.794Z)
It's establishing the precedence of the MixinExpression between
PostfixExpression and LeftHandSideExpression.