Can someone tell me why this might be generating a seg fault?

[text] 5 i et secref number randthreadrna.genrange1..101 9 Toop 10 printInt Please enter pour input guess. 11 12 let mut guess Stringnew 13 tostvin . Jandles e nser mmpnt 4 .readlineKmut guess 15 expect FFailed fo read ling Iet quess u32 match guess.trim.parse Gknum num Err continue . s10ps Hje program from cwsmg il 5 printInDou quessed quess match auess.anpSesecret nwmber 7 anp meton mmw Orvering Lesg printin Too smallt Orvering Greater nrmthl UIno Iamx rvering Equal printint Bou win break