What is the reasoning behind the lack of conversions when passing parameters

[bachmeier]

On Friday, 2 February 2024 at 23:49:21 UTC, Carl Sturtivant wrote:

> Working around this design decision in some more-than-trivial 
> situations *is* onerous. Not all coding is in the context of 
> big software projects. Versatility matters.
>
> Someone might reasonably expect parameter passing and 
> initialization to have the same semantics: after all, parameter 
> passing /is/ initialization of parameters to arguments.
>
> D lacking this possibility in some form seems to be a design 
> mistake.

I've long hated this inconvenience. It could be solved without a 
language change by putting something like this in Phobos (I've 
never actually written the code):

```
void foo(Variant x) {}
mixin(rewrite!(foo, Variant));
```

which would result in

```
void foo(T)(T x) {
   foo(Variant(x));
}
```