[ruby-core:95534] [Ruby master Feature#16275] Revert `.:` syntax

Issue #16275 has been updated by osyo (manga osyo).


`p obj.:hoge` can output source location of `#hoge` (with [#14145](https://bugs.ruby-lang.org/issues/14145)).

```ruby
p obj.:hoge
# => #<Method: X#hoge ../ruby/test.rb:4>
```

I was looking forward to seeing this because it is very useful when checking the source location of a method during debugging(especially with in irb).
It is sad that `.:` syntax is reverted.
However, I agree to use Numbered parameters rather than `.:` for block arguments.


----------------------------------------
Feature #16275: Revert `.:` syntax
https://bugs.ruby-lang.org/issues/16275#change-82310

* Author: naruse (Yui NARUSE)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
`obj.:method` is introduced at r66667 by #12125 and #13581.
It encourages the functional programming style in Ruby.

But this shorthand syntax is just for methods of `self` without arguments.
It causes another feature requests like #16273 (and lambda compositions like #15428).

Such features will introduce a new view of Ruby but no one illustrates the whole picture yet.
I worried about such patch work may cause a conflict with future expansion of functional programing style or a just a garbage feature.

`.:` syntax is introduced in 2.7.0 preview1, not released in production yet.
How about reverting at this time and re-introduce with a big picture.



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