[Fix rubocop#934] Fix a false negative for Rails/Output

Fixes rubocop#934.

This PR fixes a false negative for `Rails/Output`
when print methods without arguments.

rubocop/rubocop#1184 reported the following problem,
but it seems that it was mistakenly updated to allow no argument cases.

```console
expect(p.arity).to be 1
       ^
spec/models/cco/blog_cco2_spec.rb:46:16: C: Do not write to stdout. Use Rails' logger if you want to log.
```

It seems that rubocop/rubocop#6829 has since used that mistake.
So this PR steers `Rails/Output` back to its original intent.

changelog/fix_a_false_negative_for_rails_output.md

@@ -0,0 +1 @@
+* [#934](https://github.com/rubocop/rubocop-rails/issues/934): Fix a false negative for `Rails/Output` when print methods without arguments. ([@koic][])

lib/rubocop/cop/rails/output.rb

@@ -39,7 +39,8 @@ class Output < Base
         PATTERN
 
         def on_send(node)
-          return unless (output?(node) || io_output?(node)) && node.arguments?
+          return unless output?(node) || io_output?(node)
+          return if node.parent&.call_type?
 
           range = offense_range(node)
 

spec/rubocop/cop/rails/output_spec.rb

@@ -119,13 +119,31 @@
     RUBY
   end
 
-  it 'does not record an offense for methods without arguments' do
-    expect_no_offenses(<<~RUBY)
+  it 'registers an offense for methods without arguments' do
+    expect_offense(<<~RUBY)
       print
+      ^^^^^ Do not write to stdout. Use Rails's logger if you want to log.
       pp
+      ^^ Do not write to stdout. Use Rails's logger if you want to log.
       puts
+      ^^^^ Do not write to stdout. Use Rails's logger if you want to log.
       $stdout.write
+      ^^^^^^^^^^^^^ Do not write to stdout. Use Rails's logger if you want to log.
       STDERR.write
+      ^^^^^^^^^^^^ Do not write to stdout. Use Rails's logger if you want to log.
+    RUBY
+  end
+
+  it 'does not register an offense when a method is called to a local variable with the same name as a print method' do
+    expect_no_offenses(<<~RUBY)
+      p.do_something
+    RUBY
+  end
+
+  it 'does not register an offense when a method is ' \
+     'safe navigation called to a local variable with the same name as a print method' do
+    expect_no_offenses(<<~RUBY)
+      p&.do_something
     RUBY
   end