[SR-3111] Private top-level extensions cannot contain fileprivate members

[karwa]

Previous ID	SR-3111
Radar	None
Original Reporter	@karwa
Type	Bug

Environment

Apple Swift version 3.0 (swiftlang-800.0.46.2 clang-800.0.38)

Additional Detail from JIRA

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

md5: 9cf9a32b39718d5dd45d91c24a104529

Issue Description:

As I understand it, private at top-level is synonymous with fileprivate; so the following code should be fine. In practice the compiler won't have it.

struct MyStruct {
    init() { doSomething() }
}

private extension MyStruct {
    fileprivate func doSomething() { print("doing something...") }
}

test.swift:22:5: warning: declaring a fileprivate instance method in a private extension
    fileprivate func doSomething() { print("doing something...") }
    ^~~~~~~~~~~
    private
test.swift:18:14: error: 'doSomething' is inaccessible due to 'private' protection level
    init() { doSomething() }
             ^
test.swift:22:22: note: 'doSomething()' declared here
    fileprivate func doSomething() { print("doing something...") }
                     ^

[belkadan]

Huh, good catch. The workaround is to delete "fileprivate" (or delete the "private" and specify each member's access explicitly).