VLA in Assembler

[Foo via Digitalmars-d-learn]

Hi,
Could someone explain me, if and how it is possible to allocate a 
variable length array with inline assembly?
Somewhat like
----
int[] arr;
int n = 42;
asm {
     // allocate n stack space for arr
}
----
I know it is dangerous and all that, but I just want it know. ;)