function runFunctions(fs) {
    let error;

    S.takeWhile(f => {
      error = S.encaseEither(S.I, f, null);
      return error.isRight;
    }, fs);

    return error;
  }

  function runTests() {
    const functionTester = (name, isError) => {
      return () => {
        console.log("running " + name);
        if (isError) {
          throw new Error(name)
        }
      }
    }

    return runFunctions([
      functionTester("one", false),
      functionTester("two", true),
      functionTester("three", false),
      functionTester("four", true),
      functionTester("five", false)
    ]);
  }

  const error = runTests();
  error.isLeft ? "got error: " + error.value : "All functions passed!"