[ruby-core:71015] [Ruby trunk - Feature #11537] Introduce "Safe navigation operator"

Issue #11537 has been updated by Tsuyoshi Sawada.


The `&&` and `try` are different. I am considering the `&&` version.

Since we already have:

    a &&= b

which means

    a = a && b

By analogy from the above, and given that we want

    a && a.b

what about:

    a.&&b

or more shortly:

    a.&b

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Feature #11537: Introduce "Safe navigation operator"
https://bugs.ruby-lang.org/issues/11537#change-54389

* 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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