encoding.c (rb_enc_get_index): return -1 for non-encoding capable objects
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64178 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
encoding.c (rb_enc_get_index): return -1 for non-encoding capable objects
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64178 b2dd03c8-39d4-4d8f-98ff-823fe69b080e