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All I’ll say is: “Expression too complex to be evaluated in reasonable time”

Those who know, know.

Care to explain it for the sake of discussion?

Swift static analysis can be painfully slow, sometimes to the point where the analyzer literally just gives up.

This was much more of a problem early on though, and while it’s still possible to encounter it’s relatively infrequent and can usually be avoided.

I just got it on an infix expression with 5 elements and 2 casts (center an image in a rectangle type of thing, height/2 blahblah).

Unfrequent is not how I would describe it.