Issue #14738 has been reported by znz (Kazuhiro NISHIYAMA).

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Bug #14738: Failed to load_from_binary on 2.5.1
https://bugs.ruby-lang.org/issues/14738

* Author: znz (Kazuhiro NISHIYAMA)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
* Backport: 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED
----------------------------------------
```
%  cat /tmp/1226.rb
iseq = RubyVM::InstructionSequence.compile('num = 1 + 2')
binary = iseq.to_binary("extra_data")
p RubyVM::InstructionSequence.load_from_binary(binary).eval # => 3
%  ruby -v /tmp/1226.rb
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-darwin17]
<compiled>:1: warning: assigned but unused variable - num
Traceback (most recent call last):
	1: from /tmp/1226.rb:3:in `<main>'
/tmp/1226.rb:3:in `load_from_binary': wrong argument type nil (expected String) (TypeError)
```

rubyfarm-bisect says first bad commit is [r58979](https://github.com/ruby/ruby/commit/478003f6df40dc79d33c6ec86919f2dde07284be).
It seems trunk is aleady fixed.



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