[perl #80574] [BUG] Sequence operator not properly flattening when generator returns more than one element at a time

[Christian Bartolomaeus via RT]

This works now (after commit 
https://github.com/rakudo/rakudo/commit/cd51b3401c):

$ perl6 -e 'my @a := -> { rand, rand } ... *; say @a[0]'
0.249321170945563

The existing test was unfudged with commit 
https://github.com/perl6/roast/commit/6a567f81b9 (together with two other 
fudged tests).

I'm closing this ticket as 'resolved'.