From @skids

Int should behave as a two's complement number with infinitely extended
sign bits, per spec. As such -1 is an identity value for right shift,
as is 0. Currently -1 +> 1 is 0 in rakudo, for example, where it should
be -1.

A possible fix is at https://gist.github.com/4178797. It has not been
roasted.

Test​:
is (-4..-1 X+> 1..3), (-2,-1,-1,-2,-1 xx 8), "Right shift is two's complement"

From @usev6

This seems to work now​:

$ perl6-m -e 'say -1 +> 1'
-1

$ perl6-p -e 'say -1 +> 1'
-1

$ perl6-j -e 'say -1 +> 1'
-1

skidd++ added a test to S03-operators/bit.t with the following commit​: Raku/roast@3f8942b

I'm closing this ticket now.

@usev6 - Status changed from 'new' to 'resolved'