From alex.hartmaier@gmail.com

As just discussed in #perl6 code that I wrote with Rakudo 2011.01 stopped
working under 2012.08.
We've tracked it down to this minimal test case​:

#!/usr/bin/env perl6

use v6;

my $play_again;
repeat {
  my $input = 'n';
  $play_again = $input eq 'j';
} while $play_again;

The error thrown is​:
Cannot assign into a PMCNULL container
  in block at ./rakudo-2012.08-bug.pl6​:8

Cheers, Alex (abraxxa)

From @moritz

Fixed in 220a691 and tested in S04-statements/repeat.t

@moritz - Status changed from 'new' to 'resolved'