The only thing I can think of:
struct Once(T)
{
this(T val)
{
i = val;
}
immutable T i;
alias i this;
}
void main()
{
Once!int i = 1; // ok
i = 4; // ng
}
However it seems I've found a little hole in the system:
void foo(ref int x)
{
x = 2;
}
void main()
{
Once!int i = 1; // ok
foo(i);
assert(i == 1); // fail, changed to 2
}
Is this reported somewhere?
