Make sure match processing can handle $/ being a Junction
Make sure match processing can handle $/ being a Junction

As reported in R#4002.  The problem was caused by some private methods
not having a Mu constraint on the $/ container being passed, causing
them to be called for each of the eigenstates in the Junction.

salortiz/rakudo,rakudo/rakudo,MasterDuke17/rakudo,rakudo/rakudo,rakudo/rakudo,MasterDuke17/rakudo,tony-o/rakudo,tbrowder/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/rakudo,salortiz/rakudo,labster/rakudo,labster/rakudo,tony-o/rakudo,tbrowder/rakudo,MasterDuke17/rakudo,salortiz/rakudo,tbrowder/rakudo,rakudo/rakudo,labster/rakudo,tony-o/rakudo,rakudo/rakudo,tbrowder/rakudo,salortiz/rakudo,MasterDuke17/rakudo,labster/rakudo,tbrowder/rakudo,tony-o/rakudo,rakudo/rakudo,MasterDuke17/rakudo,salortiz/rakudo,MasterDuke17/rakudo,salortiz/rakudo,labster/rakudo,tony-o/rakudo