Function rustc_passes::intrinsicck::unpack_option_like

pub(in intrinsicck) fn unpack_option_like<'tcx>(
    tcx: TyCtxt<'tcx>, 
    ty: Ty<'tcx>
) -> Ty<'tcx>

If the type is Option<T>, it will return T, otherwise the type itself. Works on most Option-like types.