From: naruse@...
Date: 2021-02-02T08:48:52+00:00
Subject: [ruby-dev:51009] [Ruby master Bug#17575] deprecated style `respond_to?` warning with `-W:no-deprecated`

Issue #17575 has been updated by naruse (Yui NARUSE).

Backport changed from 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: REQUIRED to 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE

ruby_3_0 fb6cb226a03c2eeaf4fe68b282fcd6e4a8696ffd merged revision(s) 8dfae85adb96cf3da84bf38f2103969d4a7aed3f.

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Bug #17575: deprecated style `respond_to?` warning with `-W:no-deprecated`
https://bugs.ruby-lang.org/issues/17575#change-90240

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED, 3.0: DONE
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When `respond_to?` is defined in deprecated style, arity == 1, is warned and the defined location  is also reported.
But if deprecation warning is disabled, the main message is disabled but the next line is still shown.

```
$ ruby -W:deprecated -e 'class << (obj = "test"); def respond_to?(m) true; end; def test; defined?(foo); end; end; p obj.test' 
-e:1: warning: test.respond_to?(:foo) uses the deprecated method signature, which takes one parameter
-e:1: warning: respond_to? is defined here
"method"
```
```
$ ruby -W:no-deprecated -e 'class << (obj = "test"); def respond_to?(m) true; end; def test; defined?(foo); end; end; p obj.test' 
-e:1: warning: respond_to? is defined here
"method"
```



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