[Bug #409] Can't modify frozen ... の型

e$B%A%1%C%He(B #409 e$B$,99?7$5$l$^$7$?!#e(B (by Yukihiro M.)

frozene$B$H$$$&!V>uBV!W$O$O$?$7$F7?e(B(type)e$B$J$N$+G:$s$@$"$2$/$NJQ99$J$N$G$9$,!"JQ99$7$J$$J}$,$h$$$G$7$g$&$+!#e(B


http://redmine.ruby-lang.org/issues/show/409