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Mark unsafe for `Lint/RaiseException` cop #8178

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merged 1 commit into from Jun 21, 2020

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@koic
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koic commented Jun 21, 2020

Follow up #8169 (comment).

Lint/RaiseException cop is unsafe due to incompatibility between bad and good cases. The following is an example.

bad case

% cat /tmp/example_for_exception.rb
begin
  raise Exception
rescue
  puts 'Handle exception'
end

% ruby example_for_exception.rb
example_for_exception.rb:2:in `<main>': Exception (Exception)

good case

% cat example_for_starndard_error.rb
begin
  raise StandardError
rescue
  puts 'Handle exception'
end

% ruby /tmp/example_for_starndard_error.rb
Handle exception

Before submitting the PR make sure the following are checked:

  • Wrote good commit messages.
  • Commit message starts with [Fix #issue-number] (if the related issue exists).
  • Feature branch is up-to-date with master (if not - rebase it).
  • Squashed related commits together.
  • Added tests.
  • Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
  • The PR relates to only one subject with a clear title and description in grammatically correct, complete sentences.
  • Run bundle exec rake default. It executes all tests and RuboCop for itself, and generates the documentation.
Follow up #8169 (comment).

`Lint/RaiseException` cop is unsafe due to incompatibility
between bad and good cases.

## bad case

```console
% cat /tmp/example_for_exception.rb
begin
  raise Exception
rescue
  puts 'Handle exception'
end

% ruby example_for_exception.rb
example_for_exception.rb:2:in `<main>': Exception (Exception)
```

## good case

```console
% cat example_for_starndard_error.rb
begin
  raise StandardError
rescue
  puts 'Handle exception'
end

% ruby /tmp/example_for_starndard_error.rb
Handle exception
```
@bbatsov bbatsov merged commit 6c40930 into rubocop-hq:master Jun 21, 2020
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@bbatsov
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bbatsov commented Jun 21, 2020

Thanks!

@koic koic deleted the koic:mark_unsafe_lint_raise_exception branch Jun 21, 2020
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