WitnessUtil.Invariantmodule FileCfg : MyCFG.FileCfgval loop_heads : unit NH.tval is_after_lock : MyCFG.node -> boolval is_invariant_node : NH.key -> boolval find_syntactic_loop_head : MyCFG.node -> GoblintCil.location optionval find_syntactic_loop_condition : MyCFG.node -> GoblintCil.location option