[SR-5107] Working FileManager Swift 3 code no longer compiles in Swift 4

[swift-ci]

Previous ID	SR-5107
Radar	rdar://problem/32589382
Original Reporter	aaroncrespo (JIRA User)
Type	Bug

Environment

Xcode 9M136h

Additional Detail from JIRA

Votes	0
Component/s	Compiler, Foundation
Labels	Bug, Migrator
Assignee	None
Priority	Medium

md5: 9656be8f98655e1c73d7eb1b8b95239e

Issue Description:

The following FileManager usage needs changing between swift 4 and swift 3.

      enum AnError: Error {
        case creating
      }
      #if swift(>=4)
        var attributes = [FileAttributeKey: Any]()
        attributes[FileAttributeKey.modificationDate] = modifiedOverride
        guard FileManager.default.createFile(atPath: path.relativePath, contents: nil, attributes: attributes) else { //create
          throw AnError.creating
        }
      #else
        var attributes = [String: Any]()
        attributes[FileAttributeKey.modificationDate.rawValue] = modifiedOverride
        guard FileManager.default.createFile(atPath: path.relativePath, contents: nil, attributes: attributes) else { //create
          throw AnError.creating
        }
      #endif

[swift-ci]

Comment by aaron crespo (JIRA)

Project navigator didn't catch this change, I think either a migration is missing or some Bridging changed. The result was post Swift 4 migration I had compiler errors.

[belkadan]

This is a correct change but of course the migrator should take care of it. @akyrtzi?