The `&` operator

Property definitions

       # The `&` operator
       var n_amp: TAmp is writable, noinit

src/parser/parser_nodes.nit:2475,8--2476,42

	redef fun n_amp=(node)
	do
		_n_amp = node
		node.parent = self
	end

src/parser/parser_prod.nit:5474,2--5478,4