From @BenGoldberg1

The ‘is native’ trait works on methods. It would be nice if this were
documented.
Also, users can (and probably should) create their own traits which call
trait_mod​:<is>(Routine, :$native);

If we start with the code in
https://perl6advent.wordpress.com/2015/12/21/day-21-nativecall-backs-and-beyond-c/
we can modify it as follows​:

multi trait_mod​:<is>(Routine $r, :$e!) {
  trait_mod​:<is>($r, native => ‘expat’);
  trait_mod​:<is>($r, symbol => ‘XML_’ ~ $name);
};
class XML_Parser is repr(‘CPointer’) {
  multi trait_mod​:<is>(Routine $r, :$p!) {
  trait_mod​:<is>($r, native => ‘expat’);
  trait_mod​:<is>($r, symbol => ‘XML_Parser’ ~ $name);
  };

  method SetElemetHandler(
  &start (OpaquePointer, Str, CArray[Str]), &end (OpaquePointer, Str))
  ) {...} is e;
  our sub Create(Str -> XML_Parser) is p {...};
  method Free() is p {...};
  method Parse(Buf, int32, int32 --> int32) is e {...};
}

my $xml = ...;
my $parser = XML_Parser​::Create('UTF-8');
$parser.SetElementHandler($parser, &start-element, &end-element);
my $buf = $xml.encode('UTF-8');
$parser.Parse($buf, $buf.elems, 1);
$parser.Free;

We could make the code even more compact, with the aid of a module to
generate 'e' and 'p' for us.
That module might be used as​:
  use NativeCall​::MakeTrait "e", native => "expat", prefix => 'XML_';
  use NativeCall​::MakeTrait "p", native => "expat", prefix =>
'XML_Parser';
with details for that module left as an exercise for the reader :).

From @zoffixznet

Moved to doc repo ticket queue​: Raku/doc#1376

The RT System itself - Status changed from 'new' to 'open'

@zoffixznet - Status changed from 'open' to 'resolved'