[ruby-core:82586] [CommonRuby Feature#13581] Syntax sugar for method reference

Issue #13581 has been updated by k0kubun (Takashi Kokubun).


Oh, I'm so sad to hear obj:method (without &) is already valid. I still have hope to have it only when it's put with & in the last of arguments because that case is not valid for now. 

```ruby
irb(main):001:0> def obj(method); method; end
=> :obj
irb(main):002:0> obj:method
=> :method
irb(main):003:0> obj(&obj:method)
SyntaxError: (irb):3: syntax error, unexpected tSYMBEG, expecting keyword_do or '{' or '('
obj(&obj:method)
         ^
        from /home/k0kubun/.rbenv/versions/2.4.1/bin/irb:11:in `<main>'
irb(main):004:0> obj(&(obj:method))
SyntaxError: (irb):4: syntax error, unexpected tLABEL
obj(&(obj:method))
          ^
        from /home/k0kubun/.rbenv/versions/2.4.1/bin/irb:11:in `<main>'
```

I've never seen a person who writes a(:b) as a:b and personally I don't expect &a:b to be &a(:b).


----------------------------------------
Feature #13581: Syntax sugar for method reference
https://bugs.ruby-lang.org/issues/13581#change-66408

* Author: americodls (Americo Duarte)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
Some another programming languages (even Java, in version 8) has a cool way to refer a method as a reference.

I wrote some examples here: https://gist.github.com/americodls/20981b2864d166eee8d231904303f24b

I miss this thing in ruby.

I would thinking if is possible some like this:

~~~
roots = [1, 4, 9].map &Math.method(:sqrt)
~~~

Could be like this:

~~~
roots = [1, 4, 9].map Math->method
~~~

What do you guys thinking about it?



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