The error appears to occur due to the fact that the code uses "DBI" both as an ENUM and a module name. Try changing these 2 lines:
use enum qw[ IN DBI_ENUM ]; # *CHANGED*
my @Qs = map Thread::Queue->new(), 1 .. 2; # set up two Qs
...
## start 10 walkers # *CHANGED* next line
my @walkers = map{ threads->create( \&walker, @Qs[ IN, DBI_ENUM ] ) }
+1 .. $T; ##
This is not an optical illusion, it just looks like one.
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