As a temporary workaround until the bug is fixed, the following seems to 'cure' it and I can't see any other side effects: 

sub bar {
  if (@_) {
     return my $x = do { my $dummy; 1; };
  }
  return 0;
}

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In reply to Re: Bad return value from a block with variable localization by BrowserUk
in thread Bad return value from a block with variable localization by jesuashok

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