Ruby » Ruby master

encoding.c: check external encoding

• encoding.c (rb_enc_get_index): external encoding may not be Data
  object. [ruby-core:89016] [Bug #15122]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64753 b2dd03c8-39d4-4d8f-98ff-823fe69b080e