Rest argument allowed even when restParams is false

[andy-hanson]

This code succeeds:

require('espree').parse('(arg, ...args) => b', {
    ecmaFeatures: {
        restParams: false,
        arrowFunctions: true,
        destructuring: true,
        spread: true
    }
})

It requires both destructuring and spread to be on.
It seems to only happen for arrow functions with a parameter preceding the rest parameter.

[nzakas]

Ah yeah, that makes sense. The rest param is initially read as spread and then changes once the arrow is seen. I'll take a look.

[nzakas]

Working on this.