[swift-corelibs-dev] NSTask and try!

[james at jelee.co.uk]

Following on from a previous discussion with Tests failing on OSX. I 
have been looking into the failures. It seems that one of the earliest 
failures is due to an error from a try! within NSTask.launch(). This 
came in with this commit: 
https://github.com/apple/swift-corelibs-foundation/commit/4c6f04cfcad3d4b06688558021595d06751fc66a

Going by the docs for Foundation - The launch function apparently 
"Raises an NSInvalidArgumentException if the launch path has not been 
set or is invalid or if it fails to create a process."

https://developer.apple.com/library/mac/documentation/Cocoa/Reference/Foundation/Classes/NSTask_Class/#//apple_ref/occ/instm/NSTask/launch

My question is, should this be built into the Swift Foundation API? The 
documentation for Swift doesn't state that the launch function throws.

With the test that is failing expecting an error, it feels more Swift-y 
to have any errors throw explicitly, rather than looking at what the 
lower level fills the data with.

But before jumping into doing this, I would rather put it out there and 
see what the community feels about this?

Cheers

James