# A placeholder for a `AExpr` node
# Instances are transiantly used to mark some specific emplacements in the AST
# during complex transformations.
#
# Their must not appear in a valid AST
#
# @see AExpr::detach_with_placeholder
class APlaceholderExpr
	super AExpr
	private init make
	do
	end

	redef fun accept_ast_validation(v)
	do
		super
		debug "PARENT: remaining placeholder"
	end
end