From johan.viklund@ebc.uu.se

On rakudo (rev. 29869) this fails with message "get_pmc_keyed() not
implemented in class 'Undef'"

class Foo {
  has %.bar is rw;
  method set_bar {
  %.bar<a> = 'baz';
  }
}
my $foo = Foo.new;
$foo.set_bar();

Initializing %.bar to () solves this particular problem, but another
one appears. Shown below

class Foo {
  has %.bar is rw;
  method set_bar {
  %.bar = ();
  %.bar<a> = 'baz';
  }
}
my $foo = Foo.new;
$foo.set_bar();
my %s = $foo.bar; # <- HERE BUG APPEARS

Gives this error​: "Odd number of elements found where hash expected"

And the workaround for this is to declare set_bar like this

method set_bar {
  my %bar_temp;
  %bar_temp<a> = 'baz';
  %.bar = %bar_temp;
}

For arrays​:

class Foo {
  has @​.bar is rw;
  method set_bar {
  @​.bar.push('baz');
  }
}

Gives "Method 'push' not found for invocant of class 'Undef'"

Similar workaround as for hash (eg. initialize it first).

--
Johan Viklund

From @jnthn

Hi,

As of r30090, the following​:

--
class Foo {
  has %.bar is rw;
  method set_bar {
  %.bar<a> = 'baz';
  }
}
my $foo = Foo.new;
$foo.set_bar();
my %s = $foo.bar;
say %s<a>;
--

Now prints "baz". Also this​:

--
class Bar {
  has @​.bar is rw;
  method set_bar {
  @​.bar[0] = 100;
  @​.bar[1] = 200;
  }
}
my $bar = Bar.new;
$bar.set_bar();
my @​t = $bar.bar;
say @​t[0];
say @​t[1];
--

Prints 100, then 200.

Thanks for reporting!

Jonathan

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

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