Issue #17110 has been updated by theplen (Joey Sheets).


``` ruby
"\\".tr("\\","A") works great, with "\\" becoming "A"

"\\".tr("\\C","AB") should also output "A" but instead outputs "\\"
```


----------------------------------------
Bug #17110: String.tr unexpected behaviour with backslash
https://bugs.ruby-lang.org/issues/17110#change-86989

* Author: theplen (Joey Sheets)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x64-mingw32]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
"\\".tr("\\","A")  works great, with "\\" becoming "A"

"\\".tr("\\C","AB") should also output "A" but instead outputs "\\"




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