[ruby-core:97704] [Ruby master Feature#16755] warning: `if' at the end of line without an expression

Issue #16755 has been updated by shevegen (Robert A. Heiler).


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

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

That's pretty cool! I did not know that was possible in quite that way. Learned
something there. :D

I think https://ruby-doc.org/core/Warning.html is not the main official docu (I
always mix it up), but I noticed that there was no example for Warning.ignore()
yet. Or perhaps I did not see it. If it is not there yet, perhaps it may be
a useful idea to add it? I didn't know we can already have some control about
at the least some warnings - perhaps I am not the only one. :)

Sorry for distracting here - it's mpapis' request so he may comment if he 
would like to. (Personally I do not use this style of if/else, and I also do
not use "then", but I know a few others who used "then", such as apeiros - I
think it may depend a bit on your general ruby style possibly and what people
prefer to use. Warning.ignore() is quite cool, guess I need to test this now!)

----------------------------------------
Feature #16755: warning: `if' at the end of line without an expression
https://bugs.ruby-lang.org/issues/16755#change-84909

* 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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