fn driver_for(t: &CTerm) -> (Driver, bool)Expand description
Build the sweep driver from a term, leaving the term intact (kept as
CompiledGroup::driver_term). Returns the driver and whether it fully
checks the term — false for a case-exact term: the sweep folds its
needle (sound: an original-case match always implies the folded match)
and the exact comparison runs as a residual.