From cygx@cpan.org

The effect can be seen in https://github.com/cygx/p6-debug/blob/f432d76c2eda9ee53eca89f7e5eeee667874cf78/assert.pm6

A probably related issue with slightly differend failure mode is exhibited by the following code snippet​:

  BEGIN my $foo = 42;

  macro bar { quasi { $foo } }
  macro baz { $foo; quasi { $foo } }
  macro quux { my $ = $foo; quasi { $foo } }

  say bar, baz, quux; # => (Mu)(Mu)42

Setting MVM_SPESH_DISABLE=1 and --optimize=off does not help, so the optimizer does not appear to be involved.

@coke - Status changed from 'new' to 'stalled'