opIndexUnary post in-/decrement how to ?

[Tejas]

On Wednesday, 14 July 2021 at 20:55:32 UTC, wjoe wrote:

> In my particular case the compiler can rule out ```opIndex``` 
> so why does it abort instead of trying ```opIndexUnary``` ? Or 
> was it trying and it didn't work ? If that's the case I'd like 
> to know the reason why it discarded ```opIndexUnary```.
>
> Anyways all the answers so far are much appreciated!

Your code
```d
auto x = i[1]++;
```
Expands to:
```d
auto x = (auto e = i[1]/*notice opIndex*/, ++i[1]/* notice 
opIndexUnary*/, return e;);
```

This doesn't happen with pre increment. No compiler shenanigans.

Hence your problems.

Please take a look at the library I mentioned previously, it may 
help.