[ruby-core:78071] [Ruby trunk Bug#12918] (1/nil) can be created by Marshal.load

Issue #12918 has been reported by Shugo Maeda.

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Bug #12918: (1/nil) can be created by Marshal.load
https://bugs.ruby-lang.org/issues/12918

* Author: Shugo Maeda
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
----------------------------------------
(1/nil) can be created by Marshal.load as follows:

```
$ ./ruby -ve 'p Marshal.load("\x04\bU:\rRational[\ai\x060")'     
ruby 2.4.0dev (2016-11-10 trunk 56682) [x86_64-linux]
(1/nil)
```




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