Property definitions

nitc :: parser_prod $ AMidStringExpr :: init_amidstringexpr
	init init_amidstringexpr (
		n_string: nullable TMidString
	)
	do
		_n_string = n_string.as(not null)
		n_string.parent = self
	end
src/parser/parser_prod.nit:6789,2--6795,4