Function rustc_typeck::check::upvar::restrict_repr_packed_field_ref_capture

fn restrict_repr_packed_field_ref_capture<'tcx>(
    tcx: TyCtxt<'tcx>, 
    param_env: ParamEnv<'tcx>, 
    place: &Place<'tcx>, 
    curr_borrow_kind: UpvarCapture<'tcx>
) -> (Place<'tcx>, UpvarCapture<'tcx>)

Truncate the capture so that the place being borrowed is in accordance with RFC 1240, which states that it’s unsafe to take a reference into a struct marked repr(packed).