fixup! feat: initial implementation of new DiscreteSystem

Author: AayushSabharwal

Diff for: src/systems/systems.jl

@@ -42,13 +42,6 @@ end
 function __structural_simplify(sys::AbstractSystem, io = nothing; simplify = false,
         kwargs...)
     sys = expand_connections(sys)
-    # if sys isa DiscreteSystem
-    #     eqs = difference_order_lowering(sys)
-    #     @set! sys.unknowns = [eq.lhs for eq in eqs]
-    #     @set! sys.eqs = eqs
-    #     @show parameters(sys)
-    #     return sys
-    # end
     state = TearingState(sys)
 
     @unpack structure, fullvars = state