Function rustc_const_eval::const_eval::branches

fn branches<'tcx>(
    ecx: &InterpCx<'tcx, 'tcx, CompileTimeInterpreter<'tcx, 'tcx>>, 
    place: &MPlaceTy<'tcx>, 
    n: usize, 
    variant: Option<VariantIdx>
) -> Option<ValTree<'tcx>>