import XCTest

/// Asserts that two sequences contain equal elements.
public func eqElements<S1, S2>(_ expression1: @autoclosure () -> S1, _ expression2: @autoclosure () -> S2)
  where S1: Sequence, S2: Sequence, S1.Element == S2.Element, S1.Element: Equatable
{
  print("eqElements-overload1")
  XCTAssertEqual(Array(expression1()), Array(expression2()))
}

/// Asserts that two sequences *of pairs* contain equal elements.
public func eqElements<S1, S2, A, B>(_ expression1: @autoclosure () -> S1, _ expression2: @autoclosure () -> S2)
  where S1: Sequence, S2: Sequence, S1.Element == (A,B), S1.Element == S2.Element, A: Equatable, B: Equatable
{
  print("eqElements-overload2")
  XCTAssertTrue(expression1().elementsEqual(expression2(), by: { $0 == $1 }))
}

func test1() {
  let actual = [(label: 1, true)] // real test code omitted
  let expected = [(label: 1, true)]
  eqElements(actual, expected) // error here
}

test1()

Type '(label: Int, Bool)' cannot conform to 'Equatable'; only struct/enum/class types can conform to protocols