[ruby-core:70862] [Ruby trunk - Feature #11537] Introduce "Safe navigation operator"

Issue #11537 has been updated by Matthew Kerwin.


As per the discussion a few years ago in #8191, I'm +1 for `.?foo` syntax.

I still have a lingering question about the following; does this print "Hello" twice?

    a = Object.new
    def a.b
      puts "Hello"
    end
    a.?b.?c
    
    a && a.b && a.b.c    # this does
    a.try!(:b).try!(:c)  # this doesn't (?)

I think it should NOT call `a.b` twice.

----------------------------------------
Feature #11537: Introduce "Safe navigation operator"
https://bugs.ruby-lang.org/issues/11537#change-54242

* Author: Hiroshi SHIBATA
* Status: Open
* Priority: Normal
* Assignee: Yukihiro Matsumoto
----------------------------------------
I sometimes write following code with rails application:

```ruby
u = User.find(id)
if u && u.profile && u.profile.thumbnails && u.profiles.thumbnails.large
  ...
```

or

```ruby
# Use ActiveSupport
if u.try!(:profile).try!(:thumbnails).try!(:large)
 ...
```
I hope to write shortly above code. Groovy has above operator named "Safe navigation operator" with "`?.`" syntax.
Ruby can't use "`?.`" operator.

Can we use "`.?`" syntax. like this:

```ruby
u = User.find(id)
u.?profile.?thumbnails.?large
```

Matz. How do you think about this?




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