Issue #20322 has been updated by thomasmarshall (Thomas Marshall). I opened a PR to fix this: https://github.com/ruby/ruby/pull/10169 ---------------------------------------- Bug #20322: rb_enc_interned_str_cstr doesn't accept null pointer for encoding https://bugs.ruby-lang.org/issues/20322#change-107106 * Author: thomasmarshall (Thomas Marshall) * Status: Open * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- The [header documentation](https://github.com/ruby/ruby/blob/93556d46203545bc2364b1c0dd1281ba098f3cc9/i...) for `rb_enc_interned_str_cstr` notes:
`enc` can be a null pointer.
When [adding support for this function to TruffleRuby](https://github.com/oracle/truffleruby/pull/3427) we noticed that the behaviour did not match that documentation. I think this did work previously, but it currently causes a segmentation fault when trying to [autoload the encoding](https://github.com/ruby/ruby/blob/93556d46203545bc2364b1c0dd1281ba098f3cc9/s...) because it calls `rb_enc_mbmaxlen` which [expects a non-null encoding](https://github.com/ruby/ruby/blob/93556d46203545bc2364b1c0dd1281ba098f3cc9/i...). I'm not sure how important this behaviour is, whether extensions ever actually call this with a null pointer, or if the documentation is instead just incorrect. I think it's a straightforward fix to make the behaviour match the documentation, so I would like to open a PR, but also happy to just remove the note if that is preferable. -- https://bugs.ruby-lang.org/