Fix hang in S03-operators/repeat.t
Fix hang in S03-operators/repeat.t

xx= can never work on lists as it creates a self-referencial data structure
that will trip up endless loops in many situations.

dankogai/roast,cygx/roast,zostay/roast,cygx/roast,skids/roast,dankogai/roast,dogbert17/roast,perl6/roast,bitrauser/roast,b2gills/roast,zostay/roast,zostay/roast,b2gills/roast,skids/roast,dogbert17/roast,b2gills/roast,dankogai/roast,cygx/roast,skids/roast,bitrauser/roast