[Rubocop] Enable Style/SelfAssignment

.rubocop_todo.yml

@@ -57,10 +57,6 @@ Style/PercentLiteralDelimiters:
 Style/RegexpLiteral:
   Enabled: false
 
-# Offense count: 1
-Style/SelfAssignment:
-  Enabled: false
-
 # Offense count: 28
 # Cop supports --auto-correct.
 # Configuration parameters: EnforcedStyle, EnforcedStyleForEmptyBraces, SupportedStyles.

lib/cocoapods/generator/target_environment_header.rb

@@ -74,7 +74,7 @@ module Pod
       def common_specs(specs_by_configuration)
         result = specs_by_configuration.values.flatten.uniq
         specs_by_configuration.values.each do |configuration_specs|
-          result = result & configuration_specs
+          result &= configuration_specs
         end
         result.sort_by(&:name)
       end