Type '(Int, ())' cannot conform to 'Equatable'

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I don't believe SE-0283 was ever actually added to the language. There were issues with the implementation that led to its merge being reverted, and I believe at this point its acceptance is considered expired.

There is a more recent pitch for user-definable tuple conformances that would include this in the standard library, though.

Pitch: User-defined tuple conformances

Tuple conformances Authors: Slava Pestov Status: Implementation in progress Upcoming Feature Flag: TupleConformances Previous Proposal: SE-0283 Tuples Conform to Equatable, Comparable, and Hashable Review: (pitch) Introduction Tuples cannot conform to protocols today, and this surfaces in the form of obvious limitations, such as not being able to use a tuple of Hashable values as a Dictionary key. Motivation The desire for tuples to conform to certain standard library protocols was previously…

According to the post, you can enable the TupleConformances upcoming feature flag to try it out. It might not be stable or fully implemented yet, though.