The state of string interpolation

[John Chapman]

On Saturday, 8 December 2018 at 03:04:35 UTC, Steven 
Schveighoffer wrote:
> I'm yet unclear yet whether the implementation behaves that 
> way, but if it doesn't we should just change it so it does. But 
> he has said (a bit ambiguously) that it does do expressions 
> (comment in that PR).
>
> If we can't get arbitrary expressions to work at runtime, then 
> this proposal is no good.
>
> -Steve

It definitely does do expressions. The implementation just calls 
"parseExpression" for stuff inside '$(…)'.

int fun(int n) { return n; }

string hal = "HAL";
assert(i"$(hal) $((() => 1_000)() * 8 + fun(1_000))".text == "HAL 
9000");