class Covered::Coverage

def merge!(other)
	# If the counts are non-zero and don't match, that can indicate a problem.
	
	other.counts.each_with_index do |count, index|
		if count
			@counts[index] ||= 0
			@counts[index] += count
		end
	end
	
	@annotations.merge!(other.annotations) do |line_number, a, b|
		Array(a) + Array(b)
	end
end