* lib/irb.rb (eval_input): restore the last error `$!`, as the
previous result. [Feature #14684]
* lib/irb/context.rb (evaluate): add `exception` keyword argument
to set the last error.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63150 b2dd03c8-39d4-4d8f-98ff-823fe69b080e