From: mariimaizumi5@...
Date: 2020-12-08T13:53:14+00:00
Subject: [ruby-core:101315] [Ruby master Bug#17377] A warning message doesn't display using -W option on irb

Issue #17377 has been reported by ima1zumi (Mari Imaizumi).

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Bug #17377: A warning message doesn't display using -W option on irb
https://bugs.ruby-lang.org/issues/17377

* Author: ima1zumi (Mari Imaizumi)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0preview1 (2020-09-25 master 0096d2b895) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
## Expected

Using -W option, a warning statement display when deprecated method call.

```
$ irb -W
irb(main):001:0> Object.tainted?
(irb):1: warning: Object#tainted? is deprecated and will be removed in Ruby 3.2
=> false
```

## Actual

Although using -W option, a warning statement doesn't display when deprecated method call.

```
~/development/sandbox
$ ruby -v
ruby 3.0.0preview1 (2020-09-25 master 0096d2b895) [x86_64-darwin19]

~/development/sandbox
$ irb -v
irb 1.2.7 (2020-09-19)

~/development/sandbox
$ irb -W
irb(main):001:0> Object.tainted?
=> false
```



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