Typo in the Opaque Types section of The Swift Programming Language book

[Austin_Conlon]

I think there's a typo in the language guide and I'm not sure where the best place to report it is. The sentence "For example, here’s a version of flip(_:) that returns a value of protocol type instead of using an opaque return type" should I believe instead say "of a protocol type."

https://docs.swift.org/swift-book/LanguageGuide/OpaqueTypes.html#ID615

[Austin_Conlon]

Also on the same page I think there's a typo in a sentence toward the end "You also can’t use it as constraint a generic return type because there isn’t enough information outside the function body to infer what the generic type needs to be."

[tkremenek (Ted Kremenek)]

I'll forward this feedback along to the authors of that material. Thank you!

[Alex_Martini]

Thanks for pointing these out! I've fixed them for the next version of the book.

[Nevin]

@Austin_Conlon

"For example, here’s a version of flip(_:) that returns a value of protocol type instead of using an opaque return type" should I believe instead say "of a protocol type."

I think that one is correct as written. The function returns a value of protocol type.

[Alex_Martini]

I didn't make the exact change @Austin_Conlon suggested — I'm replacing it with:

For example, here's a version of flip(_:) that uses a protocol type as its return type instead of an opaque return type:

The phrase "a value of protocol type", although correct, can be a little hard to parse.