This is the last non-Patreon-exclusive episode of our second season. Episode 30 will appear on our Patreon page next week, then we’ll take a 6-week break and Episode 31 will be posted here on July 3. Thank you for listening!

Protocol 'XYZ' can only be used as a generic constraint because it has Self or associated type requirements. Oh no, what now?

• Alexis Gallagher: Protocols with Associated Types
• Gwendolyn Weston: Keep Calm and Type Erase On
• Mislav Javor: Swift Enums Are "sum" Types. That Makes Them Very Interesting
• Brandon Williams’ Few But Ripe blog, for learning about sum and product types, among other mathematical concepts
• The example from Soroush of using generic constraints to sidestep this issue — Gist
• Bill Venners: Abstract Type Members versus Generic Type Parameters in Scala
• Swift: Generics Manifesto
• Russ Bishop's Swift Associated Types series
• Chris Eidhof: Type Erasers in Swift