Issue #13381 has been updated by byroot (Jean Boussier).


@alanwu just pointed to me that the confusion might come from the fact that this ticket need isn't quite the same than the one I originally opened: https://bugs.ruby-lang.org/issues/16029

They are close but not quite duplicates. @eagletmt wanted a fast API to convert static C strings into Ruby strings, I wanted an API for basically `rb_str_new_frozen()` that would deduplicate at the same time without having to allocate. 

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Feature #13381: [PATCH] Expose rb_fstring and its family to C extensions
https://bugs.ruby-lang.org/issues/13381#change-88778

* Author: eagletmt (Kohei Suzuki)
* Status: Closed
* Priority: Normal
----------------------------------------
https://github.com/ruby/ruby/pull/1559

Currently, C extensions cannot use fstrings. I'd like to use
`rb_fstring_cstr` instead of `rb_str_new_cstr` for static strings in C
extensions to avoid excess allocation.

I think there's several use cases.

- https://github.com/k0kubun/hamlit/blob/v2.8.0/ext/hamlit/hamlit.c#L508-L512
- https://bitbucket.org/ged/ruby-pg/src/e5eb92cca97abc0c6fc168acfad993c2ad314589/ext/pg_connection.c?at=v0.20.0&fileviewer=file-view-default#pg_connection.c-3679
- https://bitbucket.org/ged/ruby-pg/src/e5eb92cca97abc0c6fc168acfad993c2ad314589/ext/pg_copy_coder.c?at=v0.20.0&fileviewer=file-view-default#pg_copy_coder.c-38



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