Crash on empty else

[jcoyne]

On this code: lawrencewoodman/mida@988cbe1

I ran rubocop -a and it makes a few changes, and then crashes.

---

Expected behavior

It runs all the autocorrects.

Actual behavior

Crash:

undefined method `begin_pos' for nil:NilClass
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/style/empty_else.rb:117:in `block in autocorrect'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/corrector.rb:57:in `block (2 levels) in rewrite'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/parser-2.3.1.2/lib/parser/source/rewriter.rb:194:in `transaction'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/corrector.rb:56:in `block in rewrite'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/corrector.rb:54:in `each'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/corrector.rb:54:in `rewrite'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:145:in `autocorrect_all_cops'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:77:in `autocorrect'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:105:in `block in offenses'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:122:in `investigate'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:101:in `offenses'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cop/team.rb:52:in `inspect_file'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:223:in `inspect_file'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:193:in `block in do_inspection_loop'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:183:in `loop'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:183:in `do_inspection_loop'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:93:in `block in file_offenses'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:103:in `file_offense_cache'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:91:in `file_offenses'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:82:in `process_file'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:59:in `block in inspect_files'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:57:in `each'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:57:in `inspect_files'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/runner.rb:35:in `run'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cli.rb:72:in `execute_runner'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/lib/rubocop/cli.rb:28:in `run'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/bin/rubocop:14:in `block in <top (required)>'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/2.3.0/benchmark.rb:308:in `realtime'
/Users/jcoyne/.rbenv/versions/2.3.0/lib/ruby/gems/2.3.0/gems/rubocop-0.42.0/bin/rubocop:13:in `<top (required)>'
/Users/jcoyne/.rbenv/versions/2.3.0/bin/rubocop:23:in `load'
/Users/jcoyne/.rbenv/versions/2.3.0/bin/rubocop:23:in `<main>'

Steps to reproduce the problem

This is extremely important! Providing us with a reliable way to reproduce
a problem will expedite its solution.

RuboCop version

Include the output of rubocop -V:

$ rubocop -V
0.42.0 (using Parser 2.3.1.2, running on ruby 2.3.0 x86_64-darwin14)

[Drenmi]

@jcoyne: Please try to highlight the code that causes this error. The only else-statement I can find in the code you provided doesn't have any offenses. 😀

[jcoyne]

@Drenmi I have no idea if there's anything in my code that's causing this.

[jcoyne]

@Drenmi according to the backtrace it's because this cop expects node.parent.loc.end to return something other than nil.