Looks like this is now implemented: $ perl6-m -e 'say [1,2,3].combinations(2).perl' ([1, 2], [1, 3], [2, 3]).list $ perl6-p -e 'say [1,2,3].combinations(2).perl' ([1, 2], [1, 3], [2, 3]).list $ perl6-j -e 'say [1,2,3].combinations(2).perl' ([1, 2], [1, 3], [2, 3]).list
There are tests in S32-list/combinations.t. (I didn't add a this ticket number to the tests, since this bug report refers to a difference in error messages, which are no longer relevant now.)
