attributes rule gives false error in protocol implementation after @testable

[ldiqual]

New Issue Checklist

• Updated SwiftLint to the latest version
• I searched for existing GitHub issues

Bug Report

attributes rules gives a false error on Xcode 9.3:

File.swift:15:15: warning: Attributes Violation: Attributes should be on their own lines in functions and types, but on the same line as variables and imports. (attributes)

Code:

import SomeFramework

@testable import SomeApp

private final class SomeClass: SomeProtocol { // error here
    ...
}

Environment

• SwiftLint version: 0.25.0
• Installation method used: cocoapods
• Paste your configuration file:

attributes:
  always_on_line_above:
    - "@objc"
    - "@nonobjc"
    - "@available"
    - "@discardableResult"
  always_on_same_line:
    - "@IBOutlet"
    - "@IBAction"
    - "@NSManaged"
    - "@testable"

• Are you using nested configurations? Yes, one at the root folder and one in AppTests.

• Which Xcode version are you using (check xcode-select -p)? Xcode 9.3 9E145

• Do you have a sample that shows the issue? Yes, see above

[marcelofabri]

@ldiqual Was this introduced on Xcode 9.3/Swift 4.1?

[keith]

Another repro case:

@testable import foo

private let bar = ""

I can confirm this only happens for this case with Xcode 9.3/Swift 4.1.