DMD can implicitly convert class pointer to the bool. Is it bug or terrible feature?

[ilya-stromberg]

On Sunday, 24 November 2013 at 13:57:22 UTC, Maxim Fomin wrote:
> This is neither bug not a terribale feature. Have you coded in 
> C?

Yes, only a little. I like D because it dissallow most of 
dangerous abbilities. We already have `is` operator for pointer 
comparison. Class doesn't provide cast to bool. So, why it's 
allowed?