Issue #13162 has been reported by Tsuyoshi Sawada.

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Bug #13162: tr does not recognize multi-byte characters correctly
https://bugs.ruby-lang.org/issues/13162

* Author: Tsuyoshi Sawada
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.3.3
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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This looks as expected:

```
"\\".tr('\\', '') # => ""
```

but this doesn't:


```
"\\".tr("\\'", "'") # => "\\"
```

I confirmed the strings are UTF-8.



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