[io grant] Test IO::CatHandle.slurp
[io grant] Test IO::CatHandle.slurp

1 fudged test for newly discovered bug in IO::Handle:
https://rt.perl.org/Ticket/Display.html?id=131379

perl6/roast,bitrauser/roast,dogbert17/roast,bitrauser/roast,dogbert17/roast