[ruby-core:93426] [Ruby trunk Feature#15799] pipeline operator

Issue #15799 has been updated by Eregon (Benoit Daloze).


I remembered an old blog post from over 10 years ago by Dave Thomas, and finally found it:
https://pragdave.me/blog/2007/12/30/pipelines-using-fibers-in-ruby-19.html

Interestingly the syntax is a bit similar to functional languages:
```ruby
pipeline = evens | multiples_of_three | multiples_of_seven
```

My interpretation of this is many Rubyists want a functional/Elixir-like pipe operator.
There is even still an open issue about that: #14392, and probably more issues and definitely more blog posts wanting that.
And yet the operator we introduced doesn't address that, is redundant with `.` and doesn't work for normal assignment.

----------------------------------------
Feature #15799: pipeline operator
https://bugs.ruby-lang.org/issues/15799#change-78970

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Implemented the pipeline operator `|>`, a topic of "ruby committers vs the world" in RubyKaigi 2019.
Also a casual idea of rightward assignment.

```ruby
1.. |> take 10 |> map {|e| e*2} |> (x)
p x #=> [2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
```

https://github.com/nobu/ruby/tree/feature/pipeline




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