From @zoffixznet

In this code, I would've expected the second multi to be used, since I'm not providing
any named args. I'm fuzzy on whether named params affect multi dispatch, but even if they
wouldn't the multi without any named params is later in the source​:

  $ cat test.p6
  multi foo($, :$) { say "there"; }
  multi foo($ ) { say "here"; }
  foo 42;

  $ perl6 test.p6
  there

A bit of a discussion here​: https://irclog.perlgeek.de/perl6/2016-12-27#i_13807727

I also had this to include in the ticket, though I now see it's likely unrelated,
and the throwage happens when the optimizer simply tries to work out which candidate
to call during optimization stage. And the case where throwage is avoided is simply
because the optimizer doesn't go far enough to actually call the multi. Including it anyway...7

If we make the multi that wasn't called above call itself with args matching no candidate​:

  $ cat test.p6
  multi foo($, :$) { say "there"; }
  multi foo($ ) { foo $, $; }
  foo 42;

  $ perl6 test.p6
  ===SORRY!=== Error while compiling test.p6
  Calling foo(Mu, Mu) will never work with any of these multi signatures​:
  ($, $)
  ($)
  at test.p6​:2
  ------> multi foo($ ) { ⏏foo $, $; }

Yet it still works like in the first case, if we turn off the optimizer​:

  $ cat test.p6
  multi foo($, :$) { say "there"; }
  multi foo($x ) { foo $x, $; }
  foo 42;

  $ perl6 test.p6
  there

From @zoffixznet

I messed up the end of the ticket, should read​:

Yet it still works like in the first case, if we turn off the
optimizer​:

  $ perl6 --optimize=off test.p6
  there

Or give a name to the parameter​:

  $ cat test.p6
  multi foo($, :$) { say "there"; }
  multi foo($x ) { foo $x, $; }
  foo 42;

$ perl6 test.p6
there

From @zoffixznet

On Tue, 27 Dec 2016 11​:02​:17 -0800, cpan@​zoffix.com wrote​:

In this code, I would've expected the second multi to be used, since
I'm not providing
any named args. I'm fuzzy on whether named params affect multi
dispatch, but even if they
wouldn't the multi without any named params is later in the source​:

$ cat test.p6
multi foo($, :$) { say "there"; }
multi foo($ ) { say "here"; }
foo 42;

$ perl6 test.p6
there

A bit of a discussion here​: https://irclog.perlgeek.de/perl6/2016-12-
27#i_13807727

-------------------------------------------------------------------------------------
I also had this to include in the ticket, though I now see it's likely
unrelated,
and the throwage happens when the optimizer simply tries to work out
which candidate
to call during optimization stage. And the case where throwage is
avoided is simply
because the optimizer doesn't go far enough to actually call the
multi. Including it anyway...7

If we make the multi that wasn't called above call itself with args
matching no candidate​:

$ cat test.p6
multi foo($, :$) { say "there"; }
multi foo($ ) { foo $, $; }
foo 42;

$ perl6 test.p6
===SORRY!=== Error while compiling test.p6
Calling foo(Mu, Mu) will never work with any of these multi
signatures​:
($, $)
($)
at test.p6​:2
------> multi foo($ ) { ⏏foo $, $; }

Yet it still works like in the first case, if we turn off the
optimizer​:

$ cat test.p6
multi foo($, :$) { say "there"; }
multi foo($x ) { foo $x, $; }
foo 42;

$ perl6 test.p6
there

Not a bug. See explanation by jnthn++​: https://irclog.perlgeek.de/perl6/2017-02-09#i_14074677

@zoffixznet - Status changed from 'new' to 'rejected'