[ruby-core:103805] [Ruby master Feature#17859] Start IRB when running just `ruby`

Issue #17859 has been updated by Eregon (Benoit Daloze).


+1 from me, I think it's convenient and to some extent becoming expected for modern dynamic languages (JS, Python, R, Scala and more do it).

TruffleRuby already does, and so did Rubinius.
I think the warning is a nice way to document that one can use `ruby -` if they want the current behavior even when STDIN is a TTY.

Personally I never use the current behavior of `$ ruby` when STDIN is a tty.
I find `-e` to be much more practical for those cases, and if I need more space using a file feels like the right answer.
I often do `xsel -b | ruby` though, but that would still work since STDIN is not a TTY (same for @jaruga's shell heredoc case).

----------------------------------------
Feature #17859: Start IRB when running just `ruby`
https://bugs.ruby-lang.org/issues/17859#change-91920

* Author: deivid (David Rodr刕uez)
* Status: Open
* Priority: Normal
----------------------------------------
Compare python:

```
$ python
Python 3.8.3 (default, Jul  8 2020, 16:49:12) 
[GCC 7.5.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
```

To ruby:

```
$ ruby
# just hangs
```

I think firing up a console it's a good default behaviour for beginners.



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