Function rustc_infer::infer::replace_param_and_infer_substs_with_placeholder

fn replace_param_and_infer_substs_with_placeholder<'tcx>(
    tcx: TyCtxt<'tcx>,
    substs: SubstsRef<'tcx>
) -> SubstsRef<'tcx>

Replaces substs that reference param or infer variables with suitable placeholders. This function is meant to remove these param and infer substs when they’re not actually needed to evaluate a constant.