merge revision(s) 38285: [Backport #4281]
* lib/irb/magic-file.rb: set a encoding, which is detected from the file to read, to the internal encoding. [Bug #4281][ruby-dev:43036]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38313 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 38285: [Backport #4281]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@38313 b2dd03c8-39d4-4d8f-98ff-823fe69b080e