[phaylon]

It's the part of the Rust compiler test suite that makes sure odd syntactical combinations still behave as they are supposed to.

[chrismorgan]

And I guess it’s 2015 edition, because it’ll fail in 2018 edition Rust: where the 2015 edition has ::u8(0u8), the 2018 edition will need you to write crate::u8(0u8) or self::u8(0u8), since only crates exist at the top level now, rather than the contents of the current crate as well.

[est31]

Yeah it's indeed the 2015 edition because while compiletest watches for // edition:something comments [0] (like this [1]), it doesn't pass any edition flag to the compiler if no such comment is present, and the rust compiler defaults to the 2015 edition if none was specified.

[0]: https://github.com/rust-lang/rust/blob/69b352ef7749825abde2d...

[1]: https://github.com/rust-lang/rust/blob/69b352ef7749825abde2d...

[Macha]

However, the compiler has to continue to be able to compile 2015 edition code, as it is still guaranteed to work and be intermixable with 2018 (and soon, 2021) code in the same application.

[phaylon]

Yeah. I'd assume a 2018 specific one would show up below https://github.com/rust-lang/rust/tree/master/src/test/ui/ru... if needed.