Issue #18246 has been reported by chucke (Tiago Cardoso).

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Bug #18246: send does not work for unary ! operator when operator isn't a literal symbol
https://bugs.ruby-lang.org/issues/18246

* Author: chucke (Tiago Cardoso)
* Status: Open
* Priority: Normal
* ruby -v: 3.0.2
* Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
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```ruby
1.send(:+, 1) #=> 2
1.send(:"+", 1) #=> 2
1.send(:-@) #=> -1
1.send(:"-@") #=> -1
false.send(:!@) #=> true
false.send(:"!@") #> 
# undefined method `!@' for false:FalseClass (NoMethodError)
# Did you mean?  !=
               !~
```



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