Fix doctest failure.
Fix doctest failure.

yukoba/sympy,jbbskinny/sympy,shikil/sympy,souravsingh/sympy,debugger22/sympy,farhaanbukhsh/sympy,emon10005/sympy,toolforger/sympy,MridulS/sympy,kevalds51/sympy,AkademieOlympia/sympy,souravsingh/sympy,MridulS/sympy,vipulroxx/sympy,cswiercz/sympy,jamesblunt/sympy,fperez/sympy,hrashk/sympy,VaibhavAgarwalVA/sympy,atreyv/sympy,pbrady/sympy,iamutkarshtiwari/sympy,abloomston/sympy,Vishluck/sympy,asm666/sympy,mafiya69/sympy,kaushik94/sympy,ga7g08/sympy,Davidjohnwilson/sympy,Designist/sympy,liangjiaxing/sympy,sahilshekhawat/sympy,garvitr/sympy,ahhda/sympy,maniteja123/sympy,Davidjohnwilson/sympy,atsao72/sympy,KevinGoodsell/sympy,VaibhavAgarwalVA/sympy,Vishluck/sympy,aktech/sympy,emon10005/sympy,ChristinaZografou/sympy,wanglongqi/sympy,oliverlee/sympy,bukzor/sympy,bukzor/sympy,jbbskinny/sympy,ryanGT/sympy,sahmed95/sympy,Curious72/sympy,amitjamadagni/sympy,yashsharan/sympy,iamutkarshtiwari/sympy,pbrady/sympy,srjoglekar246/sympy,liangjiaxing/sympy,Mitchkoens/sympy,farhaanbukhsh/sympy,kmacinnis/sympy,MechCoder/sympy,ahhda/sympy,rahuldan/sympy,minrk/sympy,aktech/sympy,Sumith1896/sympy,MechCoder/sympy,VaibhavAgarwalVA/sympy,sahilshekhawat/sympy,Sumith1896/sympy,abhiii5459/sympy,mcdaniel67/sympy,kumarkrishna/sympy,dqnykamp/sympy,vipulroxx/sympy,ChristinaZografou/sympy,cccfran/sympy,wyom/sympy,postvakje/sympy,farhaanbukhsh/sympy,hazelnusse/sympy-old,sahmed95/sympy,Gadal/sympy,madan96/sympy,asm666/sympy,mafiya69/sympy,dqnykamp/sympy,hazelnusse/sympy-old,atsao72/sympy,Shaswat27/sympy,yukoba/sympy,rahuldan/sympy,pandeyadarsh/sympy,Titan-C/sympy,hargup/sympy,moble/sympy,pandeyadarsh/sympy,cswiercz/sympy,ahhda/sympy,Arafatk/sympy,lidavidm/sympy,wanglongqi/sympy,shipci/sympy,pernici/sympy,asm666/sympy,kevalds51/sympy,meghana1995/sympy,sampadsaha5/sympy,Titan-C/sympy,Arafatk/sympy,Designist/sympy,abloomston/sympy,jerli/sympy,minrk/sympy,Gadal/sympy,grevutiu-gabriel/sympy,Davidjohnwilson/sympy,chaffra/sympy,lindsayad/sympy,vipulroxx/sympy,sunny94/temp,jbbskinny/sympy,beni55/sympy,jerli/sympy,shipci/sympy,yukoba/sympy,kaushik94/sympy,sampadsaha5/sympy,Shaswat27/sympy,ga7g08/sympy,wyom/sympy,Titan-C/sympy,skidzo/sympy,kmacinnis/sympy,madan96/sympy,meghana1995/sympy,skirpichev/omg,AunShiLord/sympy,kaichogami/sympy,hargup/sympy,Shaswat27/sympy,wyom/sympy,amitjamadagni/sympy,kmacinnis/sympy,jamesblunt/sympy,kumarkrishna/sympy,beni55/sympy,jamesblunt/sympy,kevalds51/sympy,garvitr/sympy,ChristinaZografou/sympy,Vishluck/sympy,kaichogami/sympy,sunny94/temp,grevutiu-gabriel/sympy,mattpap/sympy-polys,shipci/sympy,Arafatk/sympy,jaimahajan1997/sympy,moble/sympy,Curious72/sympy,cccfran/sympy,atsao72/sympy,Gadal/sympy,Sumith1896/sympy,hargup/sympy,atreyv/sympy,debugger22/sympy,sunny94/temp,kaichogami/sympy,postvakje/sympy,Curious72/sympy,pbrady/sympy,cswiercz/sympy,souravsingh/sympy,AunShiLord/sympy,maniteja123/sympy,oliverlee/sympy,lindsayad/sympy,cccfran/sympy,iamutkarshtiwari/sympy,Mitchkoens/sympy,beni55/sympy,madan96/sympy,ga7g08/sympy,sahilshekhawat/sympy,tovrstra/sympy,flacjacket/sympy,aktech/sympy,drufat/sympy,emon10005/sympy,rahuldan/sympy,bukzor/sympy,mcdaniel67/sympy,drufat/sympy,pandeyadarsh/sympy,AkademieOlympia/sympy,abhiii5459/sympy,mafiya69/sympy,abloomston/sympy,yashsharan/sympy,atreyv/sympy,AunShiLord/sympy,Designist/sympy,drufat/sympy,kumarkrishna/sympy,hrashk/sympy,saurabhjn76/sympy,jerli/sympy,chaffra/sympy,meghana1995/sympy,sampadsaha5/sympy,oliverlee/sympy,hrashk/sympy,wanglongqi/sympy,jaimahajan1997/sympy,skidzo/sympy,shikil/sympy,debugger22/sympy,toolforger/sympy,MridulS/sympy,lidavidm/sympy,maniteja123/sympy,lidavidm/sympy,postvakje/sympy,yashsharan/sympy,AkademieOlympia/sympy,toolforger/sympy,liangjiaxing/sympy,kaushik94/sympy,abhiii5459/sympy,moble/sympy,Mitchkoens/sympy,saurabhjn76/sympy,jbaayen/sympy,MechCoder/sympy,skidzo/sympy,jaimahajan1997/sympy,diofant/diofant,garvitr/sympy,saurabhjn76/sympy,shikil/sympy,grevutiu-gabriel/sympy,chaffra/sympy,sahmed95/sympy,dqnykamp/sympy,mcdaniel67/sympy,lindsayad/sympy