# The `detach` method completely remove the node in the parent.
	# However, sometime, it is useful to keep the emplacement of the removed child.
	#
	# The standard use case is the insertion of a node between a parent `p` and a child `p.c`.
	# To create the new node `n`, we need to attach the child to it.
	# But, to put `n` where `c` was in `p`, the place has to be remembered.
	#
	# ~~~nitish
	# var p: AExpr
	# var c = p.c
	# var h = c.detach_with_placeholder
	# var n = astbuilder.make_XXX(c)
	# h.replace_with(n)
	# ~~~
	fun detach_with_placeholder: AExpr
	do
		var h = new APlaceholderExpr.make
		self.replace_with(h)
		return h
	end