ParameterIdentifierTuple returns empty strings

[user1234]

On Wednesday, 2 December 2020 at 11:46:26 UTC, Andre Pany wrote:
> Hi,
>
> I need to retrieve the parameter identifier but only empty 
> strings are returned:
> tuple("", "")
>
> ``` d
> alias fpt = extern(C) nothrow void function(int a, int b);
>
> void main()
> {
>     import std.traits : ParameterIdentifierTuple;
>     pragma(msg, ParameterIdentifierTuple!(fpt));
> }
> ```
>
> Where is here the error?
>
> Kind regards
> André

If you look at the template [1] implementation, function pointers 
are rejected, apparently because of a `__parameters` limitation.

There something to report. Bad documentation at least.

[1]: 
https://github.com/dlang/phobos/blob/2c0660141748a13637ff473cbb7b0d52eb1c44db/std/traits.d#L1400