tool/ruby_vm support for pre-2.1 BASERUBY

as requested by devs, support for BASERUBY prior to 2.1

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61786 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 3 insertions, 1 deletions

diff --git a/tool/insns2vm.rb b/tool/insns2vm.rb
index e6fe64d189..8117b789fb 100755
--- a/tool/insns2vm.rb
+++ b/tool/insns2vm.rb
@@ -8,6 +8,8 @@ require_relative 'ruby_vm/scripts/insns2vm'
 if $0 == __FILE__
   router(ARGV).each do |(path, generator)|
     str = generator.generate path
-    path.write str, mode: 'wb:utf-8'
+    path.open 'wb:utf-8' do |fp|
+      fp.write str
+    end
   end
 end