[ruby-core:99501] [Ruby master Feature#17104] Do not freeze interpolated strings when using frozen-string-literal

Issue #17104 has been updated by byroot (Jean Boussier).


> I'd argue "a#{2}c" is not a string literal ("a2c" is a string literal).

I understand your point of view. However in my view what defines a literal, is the use of a specific syntax, so `""` in this case.

Same for hashes or arrays, `[1 + 2]` is a literal (to me), it might not be a "static" literal, but it is a literal nonetheless.

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Feature #17104: Do not freeze interpolated strings when using frozen-string-literal
https://bugs.ruby-lang.org/issues/17104#change-86958

* Author: bughit (bug hit)
* Status: Open
* Priority: Normal
----------------------------------------
```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'
```

Isn't the point of frozen literals to avoid needless allocations? But interpolated strings are allocated each time, so freezing appears pointless. 




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