error

you need to make the error message for the "two" term better.

if you make a mistake with the second term, it should tell you that you at least got the first term right.

TRANSLATED:

it's easy. if the first term fails, give the error for that one. if the second term fails, give the error for that one.

class TwoTerm extends Term {
	//...
	error(text) {
		const [bite1, tail1] = this.term1.eat(text)
		if (bite1 === null) {
			return this.term1.error(text)
		}
		const bite2 = this.term2.bite(tail1)
		if (bite2 === null) {
			return this.term2.error(tail1)
		}
		return null
	}
}

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