[ruby-core:97982] [Ruby master Feature#15921] R-assign (rightward-assignment) operator

Issue #15921 has been updated by zverok (Victor Shepelev).


In current head, it is so:

```ruby
x1 = 5 + 3 => y1
p [x1, y1] # [8, 8]

5 + 3 => x2 => y2
p [x2, y2] # [8, 8]

*[1, 2, 3] => x3, y3
#          ^ syntax error, unexpected =>, expecting '.' or &. or :: or '['

[1, 2, 3] => x4, y4

p [x4, y4] # => [1, 2]
```

That mostly makes sense to me (except for case 3, which seems to be "intuitively possible").

----------------------------------------
Feature #15921: R-assign (rightward-assignment) operator
https://bugs.ruby-lang.org/issues/15921#change-85211

* Author: nobu (Nobuyoshi Nakada)
* Status: Closed
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
----------------------------------------
From https://bugs.ruby-lang.org/issues/15799#change-78465, proposal of the rightward-assignment operator by `=>`.

```
$ ./ruby -v -e '(1..).lazy.map {|x| x*2} => x' -e 'p x.first(10)'
ruby 2.7.0dev (2019-06-12T06:32:32Z feature/rassgn-assoc c928f06b79) [x86_64-darwin18]
last_commit=Rightward-assign by ASSOC
[2, 4, 6, 8, 10, 12, 14, 16, 18, 20]
```

https://github.com/nobu/ruby/tree/feature/rassgn-assoc



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