return min(n, maxNewlines)
}

func mayCombine(prev token.Token, next byte) (b bool) {
	switch prev {
	case token.INT:
		b = next == '.' // 1.
	case token.ADD:
		b = next == '+' // ++
	case token.SUB:
		b = next == '-' // --
	case token.QUO:
		b = next == '*' // /*
	case token.LSS:
		b = next == '-' || next == '<' // <- or <<
	case token.AND:
		b = next == '&' || next == '^' // && or &^
	}
	return

Burnikel and Ziegler's “Fast Recursive Division” introduced the key insight of
implementing division by an n-digit divisor using recursive calls to division
by an n/2-digit divisor, relying on Karatsuba multiplication to yield a
sub-quadratic run time. However, the presentation decisions are made almost
entirely for the purpose of simplifying the run-time analysis, rather than
simplifying the presentation. Instead of a single algorithm that loops over