@NotNull
  public PairFunction<GrMethodCall, PsiMethod, PsiType> getReturnTypeCalculator() {
    if (myReturnTypeCalculatorInstance == null) {
      myReturnTypeCalculatorInstance = SingletonInstancesCache.getInstance(myReturnTypeCalculatorClassName, myClassLoader);
    }
    return myReturnTypeCalculatorInstance;
  }
@NotNull
  public PairFunction<GrMethodCall, PsiMethod, PsiType> getReturnTypeCalculator()