[ruby-core:96410] [Ruby master Misc#16444] What is the reason for the warning of IRB?

Issue #16444 has been updated by nobu (Nobuyoshi Nakada).


A patch to suppress the warning when started as `console`.

```diff
diff --git a/lib/irb/init.rb b/lib/irb/init.rb
index 2af872fd03..464b33ae03 100644
--- a/lib/irb/init.rb
+++ b/lib/irb/init.rb
@@ -31,6 +31,8 @@
     @TRACER_INITIALIZED = false
 
     # default configurations
+    @CONF[:USE_MULTILINE] = true if ap_path
+
     unless ap_path and @CONF[:AP_NAME]
       ap_path = File.join(File.dirname(File.dirname(__FILE__)), "irb.rb")
     end
```

----------------------------------------
Misc #16444: What is the reason for the warning of IRB? 
https://bugs.ruby-lang.org/issues/16444#change-83335

* Author: y-yagi (Yuji Yaginuma)
* Status: Open
* Priority: Normal
* Assignee: 
----------------------------------------
Ruby 2.7 always shows a warning when starting IRB. Why is this necessary? 

Of course, ways to suppress the warning have been suggested. 
However, libraries that extend IRB, such as `rails console` and `aruba`, may not receive arguments equivalent as IRB.
In this case, trying to run as suggested in this proposal(e.g. run `rails console` with `--legacy` argument)  will result in an error. I think this can be confusing for users.

If have not major known issues, I think we can keep the current behavior without warning. On the other hand, if there is already an issue, isn't the better for the old behavior by default?

Thanks.



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