   syntax: SyntaxOptions = .traditional,
   enableTracing: Bool = false,
   dumpAST: Bool = false,
-  xfail: Bool = false
+  xfail: Bool = false,
+  file: StaticString = #file,
+  line: UInt = #line
 ) {
   for (test, expect) in tests {
     do {

      ("abbbe", nil),
      ("accce", nil),
      ("abcbbd", nil))
  }

  func testMatchReferences() {

        }
      }
      guard let expect = expect else {
        throw "Match of \(test) succeeded where failure expected in \(regex)"
      }
      let capStrs = caps.map { $0 == nil ? nil : String($0!) }
      guard expect.count == capStrs.count else {
