Issue #17104 has been reported by bughit (bug hit).

----------------------------------------
Misc #17104: Why are interpolated string literals frozen?
https://bugs.ruby-lang.org/issues/17104

* 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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