# Expect a `PI` production, without the beginning.
	#
	# Assume `last_char` is the third byte of the production that is, the
	# next byte after the `'<?'` token.
	private fun expect_pi: Bool do
		var target = new FlatBuffer

		return lexer.expect_pi_target(target) and
				expect_pi_data(target.to_s)
	end