// name.  This is used by types to implement the inside-out
	// C++ declaration syntax.
	inner []AST

	// The printing field is a list of items we are currently
	// printing.  This avoids endless recursion if a substitution
	// reference creates a cycle in the graph.
	printing []AST
}

// writeByte adds a byte to the string being printed.
func (ps *printState) writeByte(b byte) {
	ps.last = b