Rails/IndexBy invalid correction when .to_h invocation is split in different lines

[diogoosorio]

I caught this while upgrading Rubocop in one of our company's internal codebases. This all refers to the Rails/IndexBy cop.

Given a snippet of code like so:

x.map { |y| [y.to_sym, y] }.
  to_h

The correction yields invalid Ruby code:

x.index_by { |y| y.to_sym }. # notice the ending '.'

---

Expected behavior

Not having the final dot...

Actual behavior

The additional dot makes the correction emit invalid Ruby. 😅

Steps to reproduce the problem

PR incoming with a couple of tests...

RuboCop version

[21:05:25] ~/workspace/marleyspoon/rubocop-rails ● $ bundle exec rubocop -V
0.82.0 (using Parser 2.7.1.1, running on ruby 2.6.2 x86_64-darwin19)