[swift-evolution] URL Literals

[David Sweeris]

> On Dec 19, 2016, at 11:36 AM, David Sweeris via swift-evolution <swift-evolution at swift.org> wrote:
> 
> 
>> On Dec 19, 2016, at 11:21 AM, Erica Sadun via swift-evolution <swift-evolution at swift.org <mailto:swift-evolution at swift.org>> wrote:
>> 
>> ```swift
>> let x = #imageLiteral(resourceName:"nothere.jpg")
>> print(x)
>> ```
>> 
>> This compiles. It crashes at runtime. I don't see why URLs should be any different.
>> 
>> — E
> 
> They shouldn’t be. The print function can already handle things that aren’t `CustomStringConvertible`:
> struct Foo {}
> let x = Foo()
> Foo.self is CustomStringConvertible //says `false`
> print(x) //says `"Foo()\n"`
> so, IMHO, that’s a bug.

Oh, hey, wait a second… I didn’t catch the meaning of the resource name, and thought you meant it was crashing on the print statement. I still think it’s a bug, because the compiler should be able to check if the resource exists.

- Dave Sweeris
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