Ruby » Ruby master

error.c: check redefined backtrace result

• error.c (rb_get_backtrace): check the result of backtrace even
  if the method is redefined. [ruby-core:87013] [Bug #14756]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63417 b2dd03c8-39d4-4d8f-98ff-823fe69b080e