comma operator causes hard to spot bugs

[Benjamin Thaut]

Hi,
I just had a bug due to the unitentional usage of the comma operator. So 
I'm wondering if there could something be done so that the compiler 
prevents something like this:

memStart = cast(T*)(m_allocator.AllocateMemory(size * T.sizeof), 
InitializeMemoryWith.NOTHING);

This first excutes AllocateMemory, then throws away the result and then 
casts the enum InitializeMemory.NOTHING value to a pointer, which will 
always result in a null pointer. This took me quite some time to spot.
What I actually wanted to do:

memStart = cast(T*)(m_allocator.AllocateMemory(size * T.sizeof, 
InitializeMemoryWith.NOTHING));

1) So is it actually neccessary that enums can be casted directly to 
pointers?
2) Is the functionality provided by the comma operator actually worth 
the bugs it causes?

Kind Regards
Benjamin Thaut