Documentation for prefix ? assembled from the following pages:
Language documentation: Operators §
From Operators
(Operators) prefix ? §
multi sub prefix:<?>(Mu --> Bool)Coerces the argument to Bool by calling the Bool method on it. Note that this collapses Junctions.
Enum: Bool §
From Bool
(Bool) prefix ? §
multi sub prefix:<?>(Mu --> Bool)Coerces its argument to Bool.