The following simple program snippet gives compilation errorswith gcc-4.3.4.

Program:

int main() 
{   
    char *ptr = new char[10];     
    char *ptr1 = new char[];      
    return 0; 
}  

Compilation errors:

prog.cpp: In function ‘int main()’:
prog.cpp:4: error: expected primary-expression before ‘]’ token
prog.cpp:3: warning: unused variable ‘ptr’
prog.cpp:4: warning: unused variable ‘ptr1’

But the same compiles cleanly with MSVC without any diagnostic message.

So my question is:
Does the Standard allow an new [] to be called without specifying the size? Or this a bug in MSVC?
Can someone provide a reference from the standard which will conclusively say that the above code example is ill-formed or well-formed?

I have had a look at:

5.3.4 New [expr.new] &
18.4.1.2 Array forms [lib.new.delete.array]

but couldnt find any conclusive evidence about the behavior.