Tweak the offense highlighting for Style/DefWithParentheses

lib/rubocop/cop/style/def_with_parentheses.rb

@@ -40,11 +40,10 @@ class DefWithParentheses < Base
 
         def on_def(node)
           return if node.single_line?
-          return unless !node.arguments? && (node_arguments_loc_begin = node.arguments.loc.begin)
+          return unless !node.arguments? && (node_arguments = node.arguments.source_range)
 
-          add_offense(node_arguments_loc_begin) do |corrector|
-            corrector.remove(node_arguments_loc_begin)
-            corrector.remove(node.arguments.loc.end)
+          add_offense(node_arguments) do |corrector|
+            corrector.remove(node_arguments)
           end
         end
         alias on_defs on_def

spec/rubocop/cop/style/def_with_parentheses_spec.rb

@@ -4,7 +4,7 @@
   it 'reports an offense for def with empty parens' do
     expect_offense(<<~RUBY)
       def func()
-              ^ Omit the parentheses in defs when the method doesn't accept any arguments.
+              ^^ Omit the parentheses in defs when the method doesn't accept any arguments.
       end
     RUBY
 
@@ -17,7 +17,7 @@ def func
   it 'reports an offense for class def with empty parens' do
     expect_offense(<<~RUBY)
       def Test.func()
-                   ^ Omit the parentheses in defs when the method doesn't accept any arguments.
+                   ^^ Omit the parentheses in defs when the method doesn't accept any arguments.
         something
       end
     RUBY
@@ -36,6 +36,13 @@ def func(a)
     RUBY
   end
 
+  it 'accepts def without arguments' do
+    expect_no_offenses(<<~RUBY)
+      def func
+      end
+    RUBY
+  end
+
   it 'accepts empty parentheses in one liners' do
     expect_no_offenses("def to_s() join '/' end")
   end