Short-circuiting user-defined operators

[Joe Gottman]

   Is there any way to write a user-defined operator so that it
short-circuits, like && and || ?  This might be function trait, for
instance,

  sub infix:!! ($lhs, $rhs) is short_circuit {...}

Alternatively, there might be a new parameter type that indicates that the
parameter is not evaluated immediately:

sub infix:!! ($lsh, $rhs is deferred) {...}

   In this case, it might be possible to make ordinary functions
short-circuit also

sub conditional(bool $condition, $trueCase is deferred, $falseCase is
deferred)
{
    return ($condition) ?? $trueCase :: $falseCase;
}

   I have no idea how difficult it would be to implement either of these
concepts.   Also, if a parameter is deferred, would we need a new keyword to
say when to actually evaluate it?

Joe Gottman