std.traits.ParameterIdentifierTuple producing empty results.

[Carl Sturtivant]

On Wednesday, 3 April 2024 at 10:13:56 UTC, Nick Treleaven wrote:
> I realized there's another way, inspired by your `extern 
> FunctionType` idea:
>
> ```d
> import std.traits;
>
> void foo(int i, char c);
>
> void main()
> {
>     pragma(msg, ParameterIdentifierTuple!foo); // i, c
>     alias Foo = typeof(foo);
>     pragma(msg, ParameterIdentifierTuple!Foo); // no identifiers
>     static if (is(Foo PS == __parameters))
>         void f(PS);
>     pragma(msg, ParameterIdentifierTuple!f); // i, c
> }
> ```

A neat construction! You get a function (name) of the given 
function type! This is the much needed crack in the wall. Very 
handy that the bizarre __parameters tuple PS permits the 
declaration of a function with those parameters including their 
names.

So at least at the point where a function type has been created 
this technique can produce the names inline with no coding 
complications. Many thanks.