allow alias in specific cases

[jurriaan]

This is not allowed right now, but alias_method is no alternative for alias in instance_exec:

cli.instance_exec do
  alias :old_trap_interrupt :trap_interrupt
end

[bbatsov]

Yep, I'm aware of that. alias is also required if you want to alias a global variable. We'll have to improve that cop for sure.

[whitequark]

@jurriaan You can still use cli.singleton_class.class_exec, though (and it will have the same effect, I believe).

[bbatsov]

I've added a check for global variables. At some point I'll revisit this, but it's fairly low on my todo list.

[jurriaan]

👍