From @diakopter

rakudo is currently ignoring named arguments if there is an optional
positional argument missing. Not only does it ignore the passed value
for $y, it also ignores the default value for $y provided in the
declaration.

17​:06
  rakudo​: sub foo(​:$y = 2, $x?){ say "$x""|""$y"}; foo(​:y(3), 1);
17​:06
  exp_evalbot
  OUTPUT[1|3␤]
17​:06
  diakopter
  rakudo​: sub foo($x?, :$y = 2){ say "$x""|""$y"}; foo(​:y(3), 1);
17​:06
  exp_evalbot
  OUTPUT[1|3␤]
17​:06
  diakopter
  rakudo​: sub foo($x?, :$y = 2){ say "$x""|""$y"}; foo(1, :y(3));
17​:06
  exp_evalbot
  OUTPUT[1|3␤]
17​:07
  diakopter
  rakudo​: sub foo(​:$y = 2, $x?){ say "$x""|""$y"}; foo(1, :y(3));
17​:07
  exp_evalbot
  OUTPUT[1|3␤]
17​:07
  diakopter
  yep; that's it. (here's the error - expecting OUTPUT[|3␤])
17​:07

  rakudo​: sub foo($x?, :$y = 2){ say "$x""|""$y"}; foo(​:y(3));
17​:07
  exp_evalbot
  OUTPUT[|␤]

From @pmichaud

On Sun, May 25, 2008 at 10​:31​:41AM -0700, diakopter wrote​:

rakudo is currently ignoring named arguments if there is an optional
positional argument missing. Not only does it ignore the passed value
for $y, it also ignores the default value for $y provided in the
declaration.

   rakudo​: sub foo\(​:$y = 2, $x?\)\{ say "$x"~"|"~"$y"\}; foo\(​:y\(3\), 1\);
   exp\_evalbot
   OUTPUT\[1|3␤\]

This is a syntax error that rakudo doesn't happen to catch yet.
Perl 6 requires that named parameters follow any required or
optional parameters. (According to STD.pm​:
"Can't use optional positional parameter in variadic zone")

   rakudo​: sub foo\($x?, :$y = 2\)\{ say "$x"~"|"~"$y"\}; foo\(​:y\(3\), 1\);
   exp\_evalbot
   OUTPUT\[1|3␤\]

This looks correct to me.

   rakudo​: sub foo\($x?, :$y = 2\)\{ say "$x"~"|"~"$y"\}; foo\(1, :y\(3\)\);
   exp\_evalbot
   OUTPUT\[1|3␤\]

This also looks correct.

   rakudo​: sub foo\(​:$y = 2, $x?\)\{ say "$x"~"|"~"$y"\}; foo\(1, :y\(3\)\);
   exp\_evalbot
   OUTPUT\[1|3␤\]

"Can't use optional positional parameter in variadic zone"

   rakudo​: sub foo\($x?, :$y = 2\)\{ say "$x"~"|"~"$y"\}; foo\(​:y\(3\)\);
   exp\_evalbot
   OUTPUT\[|␤\]

This appears to be a bug in Parrot (now RT#​54860). When that's fixed
this one should be fixed also.

Pm

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

From julian.notfound@gmail.com

   rakudo​: sub foo\($x?, :$y = 2\)\{ say "$x"~"|"~"$y"\}; foo\(​:y\(3\)\);
   exp\_evalbot
   OUTPUT\[|␤\]

This appears to be a bug in Parrot (now RT#​54860). When that's fixed
this one should be fixed also.

RT#​54860 is fixed, verified​:

rakudo​: sub foo($x?, :$y = 2){ say "$x""|""$y"}; foo(​:y(3));
OUTPUT[Use of uninitialized value␤|3␤]

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