[ruby-core:86134] [Ruby trunk Feature#14606] Change begin-else-end without rescue from warning to syntax error

Issue #14606 has been reported by joker1007 (Tomohiro Hashidate).

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Feature #14606: Change begin-else-end without rescue from warning to syntax error
https://bugs.ruby-lang.org/issues/14606

* Author: joker1007 (Tomohiro Hashidate)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
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~~~ ruby
begin
  p :foo
else
  p :bar
end

# => :foo
# => :bar
~~~

~~~ ruby
[1,2,3].each do
  p :foo
else
  p :bar
end

# => :foo
# => :bar
~~~

begin-else-end without rescue is useless and dangerous. (especially, do-else-end is easy to mistake)
In actually, programmer never intend to write like these.
Ruby interpreter can guard this case by syntax error.



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