Inserting to associative array do not return a lvalue.

[BCS]

Reply to Yang,

> Sorry. I thought I have a mistake. Holding a pointer to the value of
> an associative array is very dangerious.Yang Bo ??:
> 


this works

int[int] a;
a[1] = 2;
int* r = 1 in a;
(*r)++;

assert(2 == a[1]);