Function evaluate_root_goal_for_proof_tree_raw 

fn evaluate_root_goal_for_proof_tree_raw<'tcx>(
    tcx: TyCtxt<'tcx>,
    key: (CanonicalInput<'tcx>, usize),
) -> (QueryResult<TyCtxt<'tcx>>, &'tcx Probe<TyCtxt<'tcx>>, RequiredDepth)