Lint/ShadowedException can't handle multiple rescue blocks

[ptarjan]

If you don't know the inheritance between exceptions, why are you complaining about shadowing?

---

Expected behavior

$ cat a.rb
begin
rescue A, B
  nil
rescue C
  nil
end
$ rubocop a.rb
Inspecting 1 file
.

1 file inspected, no offenses detected

Actual behavior

$ cat a.rb
begin
rescue A, B
  nil
rescue C
  nil
end
$ rubocop a.rb
Inspecting 1 file
W

Offenses:

a.rb:2:1: W: Do not shadow rescued Exceptions
rescue A, B ...
^^^^^^^^^^^

1 file inspected, 1 offense detected

Steps to reproduce the problem

See above

RuboCop version

$ rubocop -V
0.42.0 (using Parser 2.3.1.2, running on ruby 2.2.4 x86_64-darwin15)

[ptarjan]

/cc @rrosenblum @jonas054

[rrosenblum]

Definitely sounds like a bug. I thought I had a test case to check for a condition like this. I will take a look.

[rrosenblum]

Interesting, rescuing a single custom exception works fine. Rescueing multiple custom exceptions in the same rescue works fine. Rescuing a custom exception in different rescues works. Rescuing multiple custom exceptions in a rescue group followed by a group with a different custom exception causes this bug. I will hopefully find a fix for this shortly.