With the latest Xcode 26.4 my project fails to compile due to a "compiler unable to type-check in reasonable time" error with a library I've been using for years and has not changed.
The library is https://github.com/ngageoint/mgrs-ios and is specifically around this line https://github.com/ngageoint/mgrs-ios/blob/master/mgrs-ios/utm/UTM.swift#L96. Since this isn't my library I can't change it, but again we've been using this library for years now without issue - it was only when Xcode updated this morning that our compilation workflow broke.
(Compilation machine is an M3 Pro with 18GB of RAM, so I don't think that's the problem here)
Since this is a change in behavior between Xcode versions, you absolutely should file this as a bug report. The expression on the line that you cited is really quite something! Make sure to post the FB number here for our reference.
Since this is a library you depend on, you should talk to the maintainers to look at breaking that up into smaller statements so that you're able to compile it with Xcode 26.4.
If you're using Swift Package Manager to import a library, there is a way you can make local modifications to a package you depend on, which might also be helpful to you here.
— Ed Ford, DTS Engineer
