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I am seeing a crash here when calling myString.last on a particular non-contiguous UTF-8 string ("किफायती मूल्य"). Calling makeContiguousUTF8() on the string before calling last works around the issue. I am only seeing this behavior in the iOS 15.4.0 beta. This feels like a Swift-level or iOS-level bug to me, but I'm curious to know more. I submitted the issue via the Feedback Assistant but also wanted to post here in case it is helpful.

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Thanks for the report. I believe @Alejandro just put up a fix for this here.

(note, strictly speaking bug is in the standard library, which isn't a "core" library... confusing I know)

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Yes, Alejandro's change fixes this.

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