[ruby-core:97692] [Ruby master Feature#16755] warning: `if' at the end of line without an expression

Issue #16755 has been updated by jeremyevans0 (Jeremy Evans).

Backport deleted (2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN)
ruby -v deleted (ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux])
Tracker changed from Bug to Feature

As you can see from the commit message in commit:ba35c14325ebbf1da8f200df83c45ee9937ff8a1, this is a new feature and expected behavior in Ruby 2.7, though it may still be considered experimental.

You can filter the warnings by overriding `Warning.warn`, or using the warning gem:

```ruby
require 'warning'
Warning.ignore(/`(els)?if' at the end of line without an expression/)
```

As the current behavior is now expected, this isn't a bug, so I'm switching this to a feature request to remove the warning.

----------------------------------------
Feature #16755: warning: `if' at the end of line without an expression
https://bugs.ruby-lang.org/issues/16755#change-84900

* Author: mpapis (Michal Papis)
* Status: Open
* Priority: Normal
----------------------------------------
I'm using this notation in a lot of scripts:
``` ruby
if
  true
then
  puts :a
else
  puts :b
end
```

Using ruby 2.6.5 I'm getting expected response:
``` shell
(0) 2.6.5 mpapis@mpapis-linux:~/tmp>ruby -w test.rb 
a

```

Using ruby 2.7.1 I'm getting extra warning:
``` shell
(0) 2.7.1 mpapis@mpapis-linux:~/tmp>ruby -w test.rb 
test.rb:1: warning: `if' at the end of line without an expression
a

```
I've tracked it to the following git commits:
* ba35c14325ebbf1da8f200df83c45ee9937ff8a1
* c303854e134043d905baff2385add44cc2c28756
* 26316cc350109ba71d42f944f3b976985627c042
* e91e3274bebc803b97971ad0a6f4ee3a8c646a60
* a087e027bf7cf0fbb825f1d55668f85ab1f3c9e6
* 30a74aaef00a99364f5423439ac44babf5066dc0




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