From: eregontp@...
Date: 2020-09-15T19:35:52+00:00
Subject: [ruby-core:100015] [Ruby master Feature#17104] Do not freeze interpolated strings when using frozen-string-literal

Issue #17104 has been updated by Eregon (Benoit Daloze).


I merged https://github.com/ruby/ruby/pull/3488 so it's in time for preview1.
@nobu Could you decide if you think https://github.com/nobu/ruby/tree/unfrozen-literal is worth it?

----------------------------------------
Feature #17104: Do not freeze interpolated strings when using frozen-string-literal
https://bugs.ruby-lang.org/issues/17104#change-87566

* Author: bughit (bug hit)
* Status: Closed
* Priority: Normal
* Assignee: Eregon (Benoit Daloze)
----------------------------------------
I think the point of frozen string literals is to avoid needless allocations. Interpolated strings are allocated each time, so freezing them appears pointless. 

```rb
#frozen_string_literal: true

def foo(str)
  "#{str}"
end

fr1 = 'a'
fr2 = 'a'
fr1_1 = foo(fr1)
fr2_1 = foo(fr2)

puts fr1.__id__, fr2.__id__, fr1_1.__id__, fr2_1.__id__

puts fr1_1 << 'b'
```




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