Fix a false positive for Style/DoubleNegation

This PR fixes the following false positive for `Style/DoubleNegation`
when inside returned conditional clauses with Ruby 2.7's pattern matching.

The following is a reproduction case.

```ruby
def foo?
  case condition
  in foo
    !!foo
  in bar
    !!bar
  else
    !!baz
  end
end
```

It is expected that an offense will not be registered, but in actually
an offense will be registered.

```console
% bundle exec rubocop --only Style/DoubleNegation
(snip)

Inspecting 2 files
C.

Offenses:

example.rb:4:5: C: [Correctable] Style/DoubleNegation: Avoid the use of double negation (!!).
    !!foo
    ^
example.rb:6:5: C: [Correctable] Style/DoubleNegation: Avoid the use of double negation (!!).
    !!bar
    ^

2 files inspected, 2 offenses detected, 2 offenses auto-correctable
```

This is a follow-up to the same issue as #10474 and requires RuboCop AST 1.7 to fix.
Therefore it bumps RuboCop AST required to use rubocop/rubocop-ast#227
to 1.7 or higher.

changelog/fix_a_false_positive_for_style_double_negation.md

@@ -0,0 +1 @@
+* [#10518](https://github.com/rubocop/rubocop/pull/10518): Fix a false positive for `Style/DoubleNegation` when inside returned conditional clauses with Ruby 2.7's pattern matching. ([@koic][])

rubocop.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |s|
   s.add_runtime_dependency('rainbow', '>= 2.2.2', '< 4.0')
   s.add_runtime_dependency('regexp_parser', '>= 1.8', '< 3.0')
   s.add_runtime_dependency('rexml')
-  s.add_runtime_dependency('rubocop-ast', '>= 1.16.0', '< 2.0')
+  s.add_runtime_dependency('rubocop-ast', '>= 1.17.0', '< 2.0')
   s.add_runtime_dependency('ruby-progressbar', '~> 1.7')
   s.add_runtime_dependency('unicode-display_width', '>= 1.4.0', '< 3.0')
 

spec/rubocop/cop/style/double_negation_spec.rb

@@ -291,6 +291,48 @@ def foo?
       RUBY
     end
 
+    # rubocop:disable RSpec/RepeatedExampleGroupDescription
+    context 'Ruby >= 2.7', :ruby27 do
+      # rubocop:enable RSpec/RepeatedExampleGroupDescription
+      it 'registers an offense and corrects for `!!` when not return location' \
+         'and using `case`, `in`, and `else`' do
+        expect_offense(<<~RUBY)
+          def foo?
+            case pattern
+            in foo
+              !!foo
+              ^ Avoid the use of double negation (`!!`).
+              do_something
+            in bar
+              !!bar
+              ^ Avoid the use of double negation (`!!`).
+              do_something
+            else
+              !!baz
+              ^ Avoid the use of double negation (`!!`).
+              do_something
+            end
+          end
+        RUBY
+
+        expect_correction(<<~RUBY)
+          def foo?
+            case pattern
+            in foo
+              !foo.nil?
+              do_something
+            in bar
+              !bar.nil?
+              do_something
+            else
+              !baz.nil?
+              do_something
+            end
+          end
+        RUBY
+      end
+    end
+
     it 'does not register an offense for `!!` when return location' do
       expect_no_offenses(<<~RUBY)
         def foo?
@@ -544,6 +586,39 @@ def foo?
         end
       RUBY
     end
+
+    # rubocop:disable RSpec/RepeatedExampleGroupDescription
+    context 'Ruby >= 2.7', :ruby27 do
+      # rubocop:enable RSpec/RepeatedExampleGroupDescription
+      it 'does not register an offense for `!!` when return location and using `case`, `in`, and `else`' do
+        expect_no_offenses(<<~RUBY)
+          def foo?
+            case condition
+            in foo
+              !!foo
+            in bar
+              !!bar
+            else
+              !!baz
+            end
+          end
+
+          def bar?
+            case condition
+            in foo
+              do_something
+              !!foo
+            in bar
+              do_something
+              !!bar
+            else
+              do_something
+              !!baz
+            end
+          end
+        RUBY
+      end
+    end
   end
 
   context 'when `EnforcedStyle: forbidden`' do