tree.setType(definitions.UNIT_TYPE);
tree.setType(Type.NoType);
    public AliasTypeDef AliasTypeDef(Symbol sym) {	AliasTypeDef tree = make.AliasTypeDef(	    sym.pos,	    sym,            mkTypeParamsOf(sym),	    TypeTerm(sym.pos, sym.nextInfo()));        tree.setType(definitions.UNIT_TYPE);        return tree;    }