[SR-11110] swift-format moves private extension when it's really fileprivate

[keith]

Previous ID	SR-11110
Radar	None
Original Reporter	@keith
Type	Bug
Status	Resolved
Resolution	Done

Environment

#1

Additional Detail from JIRA

Votes	0
Component/s	swift-format
Labels	Bug
Assignee	@allevato
Priority	Medium

md5: 358f531ec146af7e4e65c47264980635

Issue Description:

With this code:

private extension String {
  func foo() {}
}

"".foo()

swift-format produces:

extension String {
  private func foo() {}
}

"".foo()

which fails to compile with:

/tmp/bar.swift:5:4: error: 'foo' is inaccessible due to 'private' protection level
"".foo()
   ^~~
/tmp/bar.swift:2:16: note: 'foo()' declared here
  private func foo() {}
               ^

[allevato]

Fixed by #3.