Hm.... I should have run the test before I replied. I removed the negatives. Unfortunately the uppercased literals yield 0 instead of 42.
use Parrot::Test tests => 1;
output_is(<<'CODE', <<'OUTPUT', "integer literals");
print 0x2A
print "\n"
print 0X2A
print "\n"
print 0b101010
print "\n"
print 0B101010
print "\n"
end
CODE
42
42
42
42
OUTPUT
