Rubocop: Style/RedundantBegin raises errors because of a missing method (stabby_lambda?)

[kmoschcau]

As stated in the title, rubocop raises NoMethodErrors because of a missing stabby_lambda? for Rubocop::AST::SuperNode.

---

Expected behavior

Rubocop should not raise an error.

Actual behavior

Rubocop raises errors in multiple files.

Steps to reproduce the problem

One example file:

# frozen_string_literal: true

module SynTrans
  module DataTypes
    module ColumnTypes
      module Mixins
        # Provides functionality to replace newlines in Strings with
        # backslashes. It is meant to `extend` {ColumnType} instances.
        # @author Kai Moschcau [email protected]
        module BackslashNewline
          class << self
            # Checks the extended Class. Prints a warning, if the extended Class
            # is not a {CharLimitedStrings}.
            # @param [ColumnType] base The ColumnType that is extended.
            # @raise [TypeError] If the extended Class is not a {ColumnType}.
            # @return [void]
            def extended(base)
              raise(TypeError, 'the extended class has to be a ColumnType')\
                unless base.is_a? ColumnType
              warn 'BackslashNewline should extend CharLimitedStrings' unless
                base.is_a? CharLimitedStrings
            end
          end

          # Replaces newlines with backslashes before the normal transformation.
          # @param (see ColumnType#transform_value)
          # @param [String] column_name The column name of the field to limit.
          # @return (see ColumnType#transform_value)
          # @see CharLimitedStrings#transform_value
          # @yieldparam (see ColumnType#transform_value)
          def transform_value(value, column_name)
            super(value&.gsub(/\r?\n/, '\\'), column_name) { |w| yield w }
          end
        end
      end
    end
  end
end

Stacktrace:

An error occurred while Style/RedundantBegin cop was inspecting /home/kmoschcau/Code/synxis-transformer/lib/data_types/column_types/mixins/backslash_newline.rb:32:12.
undefined method `stabby_lambda?' for #<RuboCop::AST::SuperNode:0x000055dca54b2ff8>
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/style/redundant_begin.rb:68:in `on_block'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:58:in `block (2 levels) in trigger_responding_cops'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:106:in `with_cop_error_handling'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:57:in `block in trigger_responding_cops'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:56:in `each'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:56:in `trigger_responding_cops'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:34:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:100:in `on_def'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:50:in `block in on_begin'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:50:in `each'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:50:in `on_begin'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:150:in `on_while'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:150:in `on_while'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:150:in `on_while'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:150:in `on_while'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:150:in `on_while'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:35:in `block (2 levels) in <class:Commissioner>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/ast/traversal.rb:13:in `walk'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/commissioner.rb:46:in `investigate'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/team.rb:115:in `investigate'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/team.rb:103:in `offenses'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cop/team.rb:44:in `inspect_file'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:269:in `inspect_file'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:216:in `block in do_inspection_loop'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:248:in `block in iterate_until_no_changes'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:241:in `loop'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:241:in `iterate_until_no_changes'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:212:in `do_inspection_loop'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:115:in `block in file_offenses'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:133:in `file_offense_cache'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:113:in `file_offenses'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:101:in `process_file'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:78:in `block in each_inspected_file'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:75:in `each'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:75:in `reduce'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:75:in `each_inspected_file'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:67:in `inspect_files'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/runner.rb:39:in `run'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cli.rb:157:in `execute_runner'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cli.rb:85:in `execute_runners'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/lib/rubocop/cli.rb:41:in `run'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/exe/rubocop:13:in `block in <top (required)>'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/2.5.0/benchmark.rb:308:in `realtime'
/home/kmoschcau/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/rubocop-0.59.0/exe/rubocop:12:in `<top (required)>'
/home/kmoschcau/.rbenv/versions/2.5.1/bin/rubocop:23:in `load'
/home/kmoschcau/.rbenv/versions/2.5.1/bin/rubocop:23:in `<main>'

RuboCop version

$ [bundle exec] rubocop -V
0.59.0 (using Parser 2.5.1.2, running on ruby 2.5.1 x86_64-linux)

[SirRawlins]

Bitten by this one too this morning after updating to the latest Rubocop 0.59.

In my case, Devise controllers recommend overwriting their behaviour using super blocks i.e.

def new
    # Insert our behaviour into the
    # basic Devise registration process.
    super do |resource|
        # So stuff...
    end
end

The new stabby_lambda scan get's upset by this. Anyone else using/customizing Devise will come accross similar issues.