# Is `self` a token discarded from the AST?
	#
	# Loose tokens are not present in the AST.
	# It means they were identified by the lexer but were discarded by the parser.
	# It also means that they are not visited or manipulated by AST-related functions.
	#
	# Each loose token is attached to the non-loose token that precedes or follows it.
	# The rules are the following:
	#
	# * tokens that follow a non-loose token on a same line are attached to it.
	#   See `next_looses`.
	# * other tokens, thus that precede a non-loose token on the same line or the next one,
	# are attached to this one. See `prev_looses`.
	#
	# Loose tokens are mostly end of lines (`TEol`) and comments (`TComment`).
	# Whitespace are ignored by the lexer, so they are not even considered as loose tokens.
	# See `blank_before` to get the whitespace that separate tokens.
	var is_loose = false