[ruby-core:71363] [Ruby trunk - Feature #11537] Introduce "Safe navigation operator"

Issue #11537 has been updated by Yukihiro Matsumoto.


I think about this for a while, and thinking of introducing `&.` instead of `.?`, because:

* `.?` is similar to `?.` in Swift and other languages, but is different anyway.
* Since `?` is a valid suffix of method names in Ruby, we already see a lot of question marks in our programs.
* `u&.profile` reminds us as short form of `u && u.profile`.

But behavior of `&.` should be kept, i.e. it should skip `nil` but recognize `false`.

Matz.

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Feature #11537: Introduce "Safe navigation operator"
https://bugs.ruby-lang.org/issues/11537#change-54729

* Author: Hiroshi SHIBATA
* Status: Closed
* 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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