Cannot check function address

[frame]

On Wednesday, 25 May 2022 at 14:09:31 UTC, Steven Schveighoffer 
wrote:

> Yes, he acknowledged that too much was stripped. I also 
> verified similar code works.
>
> But the real problem was something else. He is saying in this 
> message "why doesn't the compiler recognize that in comparing a 
> function to null, I really wanted to compare a function 
> *pointer* to null", but I don't see how the compiler can make 
> that leap.
>
> Often times, I wish the compiler could just read what I was 
> thinking when I wrote the code, so it could give me 
> thought-contextual errors but alas, it can't.
>
> -Steve

The real problem was that I was locking my mind that the `fun` 
symbol was unique. In fact it was not. There was another code 
version where the `fun` symbol was declared as exported function 
and some import did read that code. My code was not affected from 
this bug since the call syntax for function and function pointer 
was the same. And I honestly never noticed that the compiler may 
says 'function' or 'function pointer'. It was always the same to 
me.

I should have test it with `__traits(getLocation)` before.