Fix Style/CaseLikeIf not properly handling overriden equality methods

CHANGELOG.md

@@ -35,6 +35,7 @@
 * [#8321](https://github.com/rubocop-hq/rubocop/issues/8321): Enable auto-correction for `Layout/{Def}EndAlignment`, `Lint/EmptyEnsure`. ([@marcandre][])
 * [#8583](https://github.com/rubocop-hq/rubocop/issues/8583): Fix `Style/RedundantRegexpEscape` false positive for line continuations. ([@owst][])
 * [#8593](https://github.com/rubocop-hq/rubocop/issues/8593): Fix `Style/RedundantRegexpCharacterClass` false positive for interpolated multi-line expressions. ([@owst][])
+* [#8624](https://github.com/rubocop-hq/rubocop/pull/8624): Fix an error with the `Style/CaseLikeIf` cop where it does not properly handle overridden equality methods with no arguments. ([@Skipants][])
 
 ### Changes
 
@@ -4821,3 +4822,4 @@
 [@chocolateboy]: https://github.com/chocolateboy
 [@Lykos]: https://github.com/Lykos
 [@jaimerave]: https://github.com/jaimerave
+[@Skipants]: https://github.com/Skipants

lib/rubocop/cop/style/case_like_if.rb

@@ -116,7 +116,7 @@ def find_target_in_send_node(node)
         def find_target_in_equality_node(node)
           argument = node.arguments.first
           receiver = node.receiver
-          return unless receiver
+          return unless argument && receiver
 
           if argument.literal? || const_reference?(argument)
             receiver

spec/rubocop/cop/style/case_like_if_spec.rb

@@ -336,4 +336,12 @@
       foo if x == 1
     RUBY
   end
+
+  it 'does not register an offense when an object overrides `equal?` with no arity' do
+    expect_no_offenses(<<~RUBY)
+      if x.equal?
+      elsif y
+      end
+    RUBY
+  end
 end