Thanks--returning self at the end does fix that branch of the code. As for why converting away from a role helped, doing that was also meant using BUILD rather than BUILDALL; apparently, you don't have to return the object at the end of BUILD.

It doesn't seem clear from the documentation that returning from BUILDALL would matter. Of these spots:

https://doc.perl6.org/language/objects#Object_Construction

https://doc.perl6.org/language/traps#BUILD_prevents_automatic_attribute_initialization_from_constructor_arguments

None of them talk about the return value of BUILDALL, nor is it shown in the example code.

Frankly, the perl6 docs seem to spend a lot of effort on showing how clever the language can be, and not enough on explaining what's going on.

"There is no shame in being self-taught, only in not trying to learn in the first place." -- Atrus, Myst: The Book of D'ni.

In reply to Re^6: Factory Pattern in Perl6 by hardburn
in thread Factory Pattern in Perl6 by hardburn

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.