> On Aug 29, 2015, at 3:05 PM, Gavin Eadie <ga...@umich.edu> wrote:
> 
> Apologies if off-topic, but Swift appears a lot on cocoa-dev, so maybe it’s OK
> 
> I’ve been using Swift and moving some Obj-C code over to it, but I’m 
> concerned that it thinks this is “too complex to be solved in reasonable 
> time”:
> 
>    import Foundation
>    let y = 1.0 * sin(1.0) + 1.0 * sin(1.0) + 1.0 * sin(1.0)
> 
> The above is simplified from the original (original didn’t have constants 
> under the sin function).  Swift 2.0 (Version 7.0 beta 6) reports a fatal 
> error and suggests breaking down the expression which, of course, I can do 
> but.  I’ve not seen any reports of such behavior on this list or elsewhere; 
> have you?
> 
> There’s a Radar report for this filed against Swift 1.2 (and updated for 2.0).

Due to type inference and operator overloading, figuring out what to do with + 
is hard for the compiler. This line:

let foo: [Int] = [] + [] + [] + [] + []

will generate the “too complex to be solved in reasonable time” error, and if 
you break it up like this:

let foo = [Int]()
let bar = [Int]()
let baz = [Int]()
let qux = [Int]()
let xyzzy = [Int]()

let plugh = foo + bar + baz + qux + xyzzy

it will compile, but it takes over a minute to do so on my Retinabook.

Charles

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