# The first AST token that starts the line of `self`.
	# May be null is the line contains only detached tokens (only comment)
	#
	# Computed by `parentize_tokens`
	#
	# ENSURE `result != null implies result.is_starting_line`
	fun first_token_in_line: nullable Token
	do
		return first_real_token_in_line.first_ast_token
	end