I’ve looked around <https://github.com/apple/swift/tree/master/stdlib/public/core> and read through the various Sequence and Collection definition files. AIUI, you don’t have to define both versions of Collection.subscript; the system will automatically define the missing one in terms of the other. But the source files I read don’t have a default implementation for either version of subscript. Where is that code located?
— Daryle Walker Mac, Internet, and Video Game Junkie darylew AT mac DOT com
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