[ruby-core:97250] [Ruby master Bug#16647] Redefining $/ causes irb to misbehave

Issue #16647 has been updated by aycabta (aycabta .).

Status changed from Open to Closed

It was a problem with Reline. I fixed it by https://github.com/ruby/reline/pull/129.

> My personal opinion is we should deprecate all these variables affecting default separators,
> they tend to break any non-trivial program, not just IRB, and explicit seems always clearer.

I think so, but...maybe, so many beginners use IRB to check Ruby's features.
It's just my opinion, and it was easy to fix. So I fixed it for beginners.

> hanging these variables is deprecated now, and it shows a warning

Yes, @nobu said "I forgot it (#14240) to create Pull Request (https://github.com/ruby/ruby/pull/2920) even I created a branch." after I talked about this issue (#16647) to @nobu.
I'll remove the fix of Reline after the global variables are completely removed.

----------------------------------------
Bug #16647: Redefining $/ causes irb to misbehave
https://bugs.ruby-lang.org/issues/16647#change-84367

* Author: mehagar (Michael Hagar)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
If I start irb and then do:

``` ruby
$/ = "asdf"
```


then every character I type shows a newline on the irb console. Previous versions of ruby do not have this behavior, and it is annoying.



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