Issue #12493 has been reported by Guo Xiang Tan.

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Bug #12493: Confusing did_you_mean error
https://bugs.ruby-lang.org/issues/12493

* Author: Guo Xiang Tan
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-linux]
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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```
 irb(main):001:0> test = some_string if (some_string = "test")
(irb):1: warning: found = in conditional, should be ==
NameError: undefined local variable or method `some_string' for main:Object
Did you mean?  some_string
	from (irb):1
	from /home/tgxworld/.rbenv/versions/2.3.1/bin/irb:11:in `<main>'
```

I think assignment in a one liner if statement isn't encouraged but I found the suggestion to be quite confusing. 



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