From: luke.gru@...
Date: 2019-06-15T13:19:52+00:00
Subject: [ruby-core:93159] [Ruby trunk Bug#15926] Edge case issue with	String#uminus

Issue #15926 has been reported by luke-gru (Luke Gruber).

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Bug #15926: Edge case issue with String#uminus
https://bugs.ruby-lang.org/issues/15926

* Author: luke-gru (Luke Gruber)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
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I was working on issue related to code in `rb_fstring`(https://github.com/ruby/ruby/pull/2233) and saw some weird behavior in the function,
freezing the given string if it's not a "bare" string and it's small enough to be embedded.

The issue comes up in the following edge case:

class MyString < String
end
non_frozen = MyString.new("nonfrozen")
frozen = -non_frozen # deduplicates, but shouldn't freeze receiver
non_frozen << " added" # raises FrozenError

I'm not sure what the correct behavior should be with a subclass and String#uminus. Should it return
a frozen regular String or a frozen copy of the given class's string?

Not a practical concern (not often come upon I'm sure), but I think a valid one.



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