[Bug #2972](Rejected) Windows $B$G$N(B gets(nil)

e$B%A%1%C%He(B #2972 e$B$,99?7$5$l$^$7$?!#e(B (by Nobuyoshi N.)

e$B%9%F!<%?%9e(B Opene$B$+$ie(BRejectede$B$KJQ99e(B

e$B%P%$%J%j%U%!%$%k$rFI$`$J$ie(B
‘ARGF.binmode; p gets(nil).size’
e$B$H%P%$%J%j%b!<%I$K$7$F$/$@$5$$!#e(B

http://redmine.ruby-lang.org/issues/show/2972