[ruby-core:87830] [Ruby trunk Bug#14897] Unexpected behavior of `if` in specific code

Issue #14897 has been reported by peitetsu (teppei takeo).

----------------------------------------
Bug #14897: Unexpected behavior of `if` in specific code
https://bugs.ruby-lang.org/issues/14897

* Author: peitetsu (teppei takeo)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.0p0 (2017-12-25 revision 61468) [x86_64-darwin17]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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I found a strange behavior of `if` in the following code.

~~~ ruby
def seems_bug(obj)
  if obj || obj
    obj = obj
  else
    raise obj.inspect
  end
  obj
end

seems_bug('foo')
#=> RuntimeError: "foo"
~~~

This code is expected to return "foo", but the error on the else clause occurs. 

The same error occurs in the following code.

~~~ ruby
def seems_bug(obj)
  if obj || any1
    any2 = any2
  else
    raise obj.inspect
  end
  obj
end

seems_bug('foo')
#=> RuntimeError: "foo"
~~~





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