[SR-7427] Warning seen on Linux, but not on Darwin

[alblue]

Previous ID	SR-7427
Radar	None
Original Reporter	@alblue
Type	Bug
Status	Closed
Resolution	Duplicate

Environment

Maybe the Darwin version has a @discardableResult inferred, but the Linux version doesn't?

Additional Detail from JIRA

Votes	0
Component/s	Foundation
Labels	Bug
Assignee	@keith
Priority	Medium

md5: ffc858aa35aaef61dbab2dde595ed6f7

Issue Description:

With the following code, and running on Swift 4.1:

import Foundation
FileManager.createFile(atPath:"/tmp/foo", contents:Data())

I get no compile warning on Swift 4.1 (Apple Swift version 4.1) but I do on Swift 4.1-Linux

tst.swift:2:21: warning: result of call to 'createFile(atPath:contents:attributes🙂' is unused

[belkadan]

All imported methods get @discardableResult by default unless they have the warn_unused_result attribute. But I don't know which version the Foundation folks would rather be consistent on.

[keith]

#1742

[keith]

Closing as dup of https://bugs.swift.org/browse/SR-1638 but my linked PR fixes both