# The indication that the node did not pass some semantic verifications.
	#
	# This simple flag is set by a given analysis to say that the node is broken and unusable in
	# an execution.
	# When a node status is set to broken, it is usually associated with a error message.
	#
	# If it is safe to do so, clients of the AST SHOULD just skip broken nodes in their processing.
	# Clients that do not care about the executability (e.g. metrics) MAY still process the node or
	# perform specific checks to determinate the validity of the node.
	#
	# Note that the broken status is not propagated to parent or children nodes.
	# e.g. a broken expression used as argument does not make the whole call broken.
	var is_broken = false is writable