Fix compile errors for Swift 6 language mode

Author: b1ackturtle

Diff for: Tests/SwiftAlgorithmsTests/GroupedTests.swift

@@ -13,7 +13,7 @@ import XCTest
 import Algorithms
 
 final class GroupedTests: XCTestCase {
-  private class SampleError: Error {}
+  private final class SampleError: Error {}
 
   // Based on https://github.com/apple/swift/blob/4d1d8a9de5ebc132a17aee9fc267461facf89bf8/validation-test/stdlib/Dictionary.swift#L1974-L1988
 

Diff for: Tests/SwiftAlgorithmsTests/KeyedTests.swift

@@ -13,7 +13,7 @@ import XCTest
 import Algorithms
 
 final class KeyedTests: XCTestCase {
-  private class SampleError: Error {}
+  private final class SampleError: Error {}
 
   func testUniqueKeys() {
     let d = ["Apple", "Banana", "Cherry"].keyed(by: { $0.first! })

Diff for: Tests/SwiftAlgorithmsTests/RandomSampleTests.swift

@@ -16,7 +16,7 @@ func validateRandomSamples<S: Sequence>(
   _ samples: [Int: Int],
   elements: S,
   expectedValue: Int,
-  file: StaticString = #file, line: UInt = #line
+  file: StaticString = (#file), line: UInt = #line
 ) where S.Element == Int {
   let expectedRange = ((expectedValue / 3) * 2) ... ((expectedValue / 3) * 4)
   XCTAssertEqualSequences(samples.keys.sorted(), elements,

Diff for: Tests/SwiftAlgorithmsTests/TestUtilities.swift

@@ -78,7 +78,7 @@ func XCTAssertEqualSequences<S1: Sequence, S2: Sequence>(
   _ expression1: @autoclosure () throws -> S1,
   _ expression2: @autoclosure () throws -> S2,
   _ message: @autoclosure () -> String = "",
-  file: StaticString = #file, line: UInt = #line
+  file: StaticString = (#file), line: UInt = #line
 ) rethrows where S1.Element: Equatable, S1.Element == S2.Element {
   try XCTAssertEqualSequences(expression1(), expression2(), by: ==,
     message(), file: file, line: line)
@@ -88,7 +88,7 @@ func XCTAssertEqualSequences<S1: Sequence, S2: Sequence>(
 func XCTAssertUnorderedEqualSequences<S1: Sequence, S2: Sequence>(
   _ expression1: @autoclosure () throws -> S1,
   _ expression2: @autoclosure () throws -> S2,
-  file: StaticString = #file, line: UInt = #line
+  file: StaticString = (#file), line: UInt = #line
 ) rethrows where S1.Element: Equatable, S1.Element == S2.Element {
   var s1 = Array(try expression1())
   var missing: [S1.Element] = []
@@ -116,7 +116,7 @@ func XCTAssertEqualSequences<S1: Sequence, S2: Sequence>(
   _ expression2: @autoclosure () throws -> S2,
   by areEquivalent: (S1.Element, S1.Element) -> Bool,
   _ message: @autoclosure () -> String = "",
-  file: StaticString = #file, line: UInt = #line
+  file: StaticString = (#file), line: UInt = #line
 ) rethrows where S1.Element == S2.Element {
 
   func fail(_ reason: String) {
@@ -153,7 +153,7 @@ func XCTAssertEqualCollections<C1: Collection, C2: Collection>(
   _ expression1: @autoclosure () throws -> C1,
   _ expression2: @autoclosure () throws -> C2,
   _ message: @autoclosure () -> String = "",
-  file: StaticString = #file, line: UInt = #line
+  file: StaticString = (#file), line: UInt = #line
 ) rethrows where C1.Element: Equatable, C1.Element == C2.Element {
   let c1 = try expression1()
   let c2 = try expression2()