public static @NotNull Nullability inferMethodNullability(PsiMethod method) {
    if (PsiUtil.resolveClassInType(method.getReturnType()) == null) {
      return Nullability.UNKNOWN;
    }

    return inferBlockNullability(method, suppressNullable(method));
  }
public static @NotNull Nullability inferMethodNullability(PsiMethod method)