auto merge of #4372 : thiagopnts/servo/errorevent, r=Ms2ger
auto merge of #4372 : thiagopnts/servo/errorevent, r=Ms2ger

Fixes #4174.

dagnir/servo,nerith/servo,jimberlage/servo,wartman4404/servo,szeged/servo,indykish/servo,upsuper/servo,dhananjay92/servo,aweinstock314/servo,meh/servo,codemac/servo,KiChjang/servo,evilpie/servo,brendandahl/servo,chotchki/servo,rnestler/servo,vks/servo,rixrix/servo,eddyb/servo,dhananjay92/servo,mattnenterprise/servo,echochamber/servo,aweinstock314/servo,caldwell/servo,nrc/servo,hyowon/servo,pyecs/servo,larsbergstrom/servo,steveklabnik/servo,tschneidereit/servo,saratang/servo,thiagopnts/servo,rixrix/servo,tafia/servo,dagnir/servo,bjwbell/servo,ConnorGBrewster/servo,Adenilson/prototype-viewing-distance,ruud-v-a/servo,AnthonyBroadCrawford/servo,splav/servo,karlito40/servo,mbrubeck/servo,tempbottle/servo,zhangjunlei26/servo,paulrouget/servo,nerith/servo,runarberg/servo,GyrosOfWar/servo,rnestler/servo,eddyb/servo,youprofit/servo,avadacatavra/servo,dati91/servo,ConnorGBrewster/servo,larsbergstrom/servo,paulrouget/servo,luniv/servo,s142857/servo,KiChjang/servo,emilio/servo,RenaudParis/servo,dhananjay92/servo,srbhklkrn/SERVOENGINE,notriddle/servo,pyfisch/servo,szeged/servo,ConnorGBrewster/servo,A-deLuna/servo,dvberkel/servo,DominoTree/servo,thiagopnts/servo,youprofit/servo,rentongzhang/servo,peterjoel/servo,nrc/servo,sadmansk/servo,zhangjunlei26/servo,saneyuki/servo,tempbottle/servo,boghison/servo,mt2d2/servo,tafia/servo,mdibaiee/servo,brendandahl/servo,CJ8664/servo,thiagopnts/servo,AnthonyBroadCrawford/servo,g-k/servo,pyecs/servo,mbrubeck/servo,g-k/servo,thiagopnts/servo,KiChjang/servo,sadmansk/servo,meh/servo,peterjoel/servo,pyfisch/servo,dsandeephegde/servo,splav/servo,evilpie/servo,dagnir/servo,szeged/servo,g-k/servo,saratang/servo,walac/servo,pyfisch/servo,dmarcos/servo,rixrix/servo,fiji-flo/servo,SimonSapin/servo,tafia/servo,snf/servo,tempbottle/servo,kindersung/servo,nnethercote/servo,thiagopnts/servo,zhangjunlei26/servo,jgraham/servo,CJ8664/servo,zentner-kyle/servo,RenaudParis/servo,boghison/servo,larsbergstrom/servo,luniv/servo,tempbottle/servo,indykish/servo,deokjinkim/servo,mbrubeck/servo,KiChjang/servo,eddyb/servo,j3parker/servo,mattnenterprise/servo,aidanhs/servo,rnestler/servo,steveklabnik/servo,saratang/servo,KiChjang/servo,nick-thompson/servo,cbrewster/servo,paulrouget/servo,GyrosOfWar/servo,meh/servo,huonw/servo,karlito40/servo,saneyuki/servo,vks/servo,CJ8664/servo,nick-thompson/servo,hyowon/servo,mdibaiee/servo,CJ8664/servo,dsandeephegde/servo,jgraham/servo,DominoTree/servo,cbrewster/servo,peterjoel/servo,samfoo/servo,splav/servo,nrc/servo,jimberlage/servo,youprofit/servo,s142857/servo,hyowon/servo,walac/servo,huonw/servo,upsuper/servo,evilpie/servo,boghison/servo,fiji-flo/servo,emilio/servo,cbrewster/servo,caldwell/servo,kindersung/servo,samfoo/servo,runarberg/servo,ryancanhelpyou/servo,hyowon/servo,wpgallih/servo,s142857/servo,dsandeephegde/servo,indykish/servo,j3parker/servo,codemac/servo,saneyuki/servo,tafia/servo,mattnenterprise/servo,Adenilson/prototype-viewing-distance,wpgallih/servo,mattnenterprise/servo,walac/servo,notriddle/servo,peterjoel/servo,SimonSapin/servo,Adenilson/prototype-viewing-distance,j3parker/servo,jlegendary/servo,mbrubeck/servo,rentongzhang/servo,nrc/servo,snf/servo,rixrix/servo,cbrewster/servo,luniv/servo,evilpie/servo,nick-thompson/servo,GyrosOfWar/servo,saratang/servo,tschneidereit/servo,RenaudParis/servo,rnestler/servo,nnethercote/servo,GreenRecycleBin/servo,splav/servo,CJ8664/servo,jdramani/servo,WriterOfAlicrow/servo,jdramani/servo,RenaudParis/servo,rnestler/servo,youprofit/servo,kindersung/servo,boghison/servo,brendandahl/servo,szeged/servo,indykish/servo,akosel/servo,dmarcos/servo,notriddle/servo,notriddle/servo,aidanhs/servo,rnestler/servo,ConnorGBrewster/servo,steveklabnik/servo,huonw/servo,ryancanhelpyou/servo,g-k/servo,dagnir/servo,mbrubeck/servo,walac/servo,aweinstock314/servo,rnestler/servo,dati91/servo,dmarcos/servo,dati91/servo,fiji-flo/servo,nnethercote/servo,DominoTree/servo,evilpie/servo,larsbergstrom/servo,mt2d2/servo,ryancanhelpyou/servo,bjwbell/servo,RenaudParis/servo,indykish/servo,samfoo/servo,vks/servo,splav/servo,rentongzhang/servo,mt2d2/servo,larsbergstrom/servo,caldwell/servo,akosel/servo,dmarcos/servo,anthgur/servo,rixrix/servo,dvberkel/servo,wartman4404/servo,anthgur/servo,jlegendary/servo,fiji-flo/servo,wpgallih/servo,huonw/servo,jdramani/servo,mbrubeck/servo,jgraham/servo,tschneidereit/servo,mdibaiee/servo,aidanhs/servo,rentongzhang/servo,vks/servo,zentner-kyle/servo,deokjinkim/servo,chotchki/servo,GyrosOfWar/servo,echochamber/servo,canaltinova/servo,meh/servo,aweinstock314/servo,jlegendary/servo,DominoTree/servo,emilio/servo,emilio/servo,ruud-v-a/servo,dvberkel/servo,jimberlage/servo,dsandeephegde/servo,cbrewster/servo,canaltinova/servo,cbrewster/servo,GreenRecycleBin/servo,karlito40/servo,tafia/servo,vks/servo,zhangjunlei26/servo,dati91/servo,mt2d2/servo,pyfisch/servo,deokjinkim/servo,A-deLuna/servo,rentongzhang/servo,avadacatavra/servo,pyecs/servo,jdramani/servo,nnethercote/servo,mdibaiee/servo,dhananjay92/servo,mbrubeck/servo,snf/servo,srbhklkrn/SERVOENGINE,rentongzhang/servo,eddyb/servo,anthgur/servo,bjwbell/servo,thiagopnts/servo,A-deLuna/servo,KiChjang/servo,A-deLuna/servo,jimberlage/servo,steveklabnik/servo,s142857/servo,pgonda/servo,zhangjunlei26/servo,snf/servo,emilio/servo,nnethercote/servo,aweinstock314/servo,indykish/servo,tempbottle/servo,cbrewster/servo,canaltinova/servo,wpgallih/servo,szeged/servo,DominoTree/servo,GyrosOfWar/servo,kindersung/servo,peterjoel/servo,deokjinkim/servo,wpgallih/servo,rnestler/servo,AnthonyBroadCrawford/servo,walac/servo,SimonSapin/servo,jdramani/servo,aweinstock314/servo,eddyb/servo,larsbergstrom/servo,pgonda/servo,pyfisch/servo,jimberlage/servo,caldwell/servo,ruud-v-a/servo,j3parker/servo,nnethercote/servo,tafia/servo,samfoo/servo,SimonSapin/servo,splav/servo,GreenRecycleBin/servo,vks/servo,ryancanhelpyou/servo,brendandahl/servo,hyowon/servo,emilio/servo,dmarcos/servo,dvberkel/servo,codemac/servo,nerith/servo,hyowon/servo,GreenRecycleBin/servo,emilio/servo,DominoTree/servo,kindersung/servo,sadmansk/servo,meh/servo,eddyb/servo,fiji-flo/servo,emilio/servo,ruud-v-a/servo,dhananjay92/servo,dvberkel/servo,runarberg/servo,Adenilson/prototype-viewing-distance,mattnenterprise/servo,akosel/servo,A-deLuna/servo,codemac/servo,paulrouget/servo,WriterOfAlicrow/servo,canaltinova/servo,GreenRecycleBin/servo,runarberg/servo,pgonda/servo,srbhklkrn/SERVOENGINE,emilio/servo,splav/servo,saneyuki/servo,upsuper/servo,szeged/servo,meh/servo,canaltinova/servo,tafia/servo,dsandeephegde/servo,youprofit/servo,upsuper/servo,walac/servo,fiji-flo/servo,tschneidereit/servo,jlegendary/servo,snf/servo,steveklabnik/servo,huonw/servo,KiChjang/servo,szeged/servo,WriterOfAlicrow/servo,evilpie/servo,boghison/servo,nerith/servo,ConnorGBrewster/servo,kindersung/servo,paulrouget/servo,sadmansk/servo,avadacatavra/servo,larsbergstrom/servo,pyfisch/servo,codemac/servo,deokjinkim/servo,snf/servo,peterjoel/servo,nrc/servo,jimberlage/servo,saneyuki/servo,canaltinova/servo,nrc/servo,nerith/servo,DominoTree/servo,peterjoel/servo,aidanhs/servo,ConnorGBrewster/servo,pyecs/servo,nick-thompson/servo,szeged/servo,wartman4404/servo,steveklabnik/servo,notriddle/servo,avadacatavra/servo,s142857/servo,tschneidereit/servo,g-k/servo,pgonda/servo,srbhklkrn/SERVOENGINE,nnethercote/servo,WriterOfAlicrow/servo,chotchki/servo,pyfisch/servo,luniv/servo,saneyuki/servo,pgonda/servo,peterjoel/servo,dati91/servo,upsuper/servo,tschneidereit/servo,jimberlage/servo,wpgallih/servo,vks/servo,brendandahl/servo,saratang/servo,g-k/servo,kindersung/servo,boghison/servo,Adenilson/prototype-viewing-distance,sadmansk/servo,A-deLuna/servo,GreenRecycleBin/servo,zhangjunlei26/servo,dati91/servo,paulrouget/servo,eddyb/servo,larsbergstrom/servo,thiagopnts/servo,GreenRecycleBin/servo,GreenRecycleBin/servo,notriddle/servo,zentner-kyle/servo,rentongzhang/servo,sadmansk/servo,upsuper/servo,brendandahl/servo,zentner-kyle/servo,KiChjang/servo,WriterOfAlicrow/servo,emilio/servo,evilpie/servo,tempbottle/servo,splav/servo,indykish/servo,saneyuki/servo,A-deLuna/servo,nick-thompson/servo,zhangjunlei26/servo,AnthonyBroadCrawford/servo,fiji-flo/servo,anthgur/servo,indykish/servo,dsandeephegde/servo,SimonSapin/servo,indykish/servo,mt2d2/servo,pyecs/servo,chotchki/servo,jdramani/servo,dhananjay92/servo,echochamber/servo,dvberkel/servo,zhangjunlei26/servo,KiChjang/servo,caldwell/servo,deokjinkim/servo,snf/servo,pyfisch/servo,mattnenterprise/servo,codemac/servo,dagnir/servo,zentner-kyle/servo,dsandeephegde/servo,DominoTree/servo,splav/servo,cbrewster/servo,AnthonyBroadCrawford/servo,youprofit/servo,steveklabnik/servo,runarberg/servo,paulrouget/servo,akosel/servo,evilpie/servo,samfoo/servo,avadacatavra/servo,akosel/servo,bjwbell/servo,wartman4404/servo,caldwell/servo,sadmansk/servo,RenaudParis/servo,zentner-kyle/servo,GyrosOfWar/servo,codemac/servo,saneyuki/servo,wartman4404/servo,hyowon/servo,nick-thompson/servo,bjwbell/servo,AnthonyBroadCrawford/servo,ruud-v-a/servo,nerith/servo,pyecs/servo,rixrix/servo,dmarcos/servo,upsuper/servo,mdibaiee/servo,g-k/servo,mattnenterprise/servo,dsandeephegde/servo,WriterOfAlicrow/servo,avadacatavra/servo,paulrouget/servo,sadmansk/servo,j3parker/servo,s142857/servo,evilpie/servo,aidanhs/servo,nnethercote/servo,echochamber/servo,runarberg/servo,thiagopnts/servo,szeged/servo,dati91/servo,mdibaiee/servo,jgraham/servo,brendandahl/servo,SimonSapin/servo,walac/servo,paulrouget/servo,chotchki/servo,nnethercote/servo,anthgur/servo,jlegendary/servo,notriddle/servo,SimonSapin/servo,AnthonyBroadCrawford/servo,mt2d2/servo,echochamber/servo,paulrouget/servo,dati91/servo,s142857/servo,wartman4404/servo,luniv/servo,pyfisch/servo,karlito40/servo,ryancanhelpyou/servo,eddyb/servo,mbrubeck/servo,ConnorGBrewster/servo,karlito40/servo,anthgur/servo,tschneidereit/servo,wartman4404/servo,wpgallih/servo,srbhklkrn/SERVOENGINE,anthgur/servo,saratang/servo,jgraham/servo,GyrosOfWar/servo,Adenilson/prototype-viewing-distance,rixrix/servo,meh/servo,ruud-v-a/servo,ConnorGBrewster/servo,WriterOfAlicrow/servo,aweinstock314/servo,ryancanhelpyou/servo,notriddle/servo,bjwbell/servo,rixrix/servo,samfoo/servo,CJ8664/servo,wpgallih/servo,avadacatavra/servo,akosel/servo,mt2d2/servo,DominoTree/servo,peterjoel/servo,dagnir/servo,dhananjay92/servo,KiChjang/servo,srbhklkrn/SERVOENGINE,deokjinkim/servo,chotchki/servo,nrc/servo,mdibaiee/servo,j3parker/servo,karlito40/servo,aidanhs/servo,boghison/servo,splav/servo,jdramani/servo,saratang/servo,youprofit/servo,runarberg/servo,jgraham/servo,akosel/servo,pyecs/servo,upsuper/servo,caldwell/servo,mattnenterprise/servo,peterjoel/servo,jimberlage/servo,DominoTree/servo,rixrix/servo,dagnir/servo,luniv/servo,j3parker/servo,nnethercote/servo,canaltinova/servo,echochamber/servo,tempbottle/servo,pyfisch/servo,larsbergstrom/servo,notriddle/servo,dmarcos/servo,avadacatavra/servo,luniv/servo,zentner-kyle/servo,srbhklkrn/SERVOENGINE,ryancanhelpyou/servo,zhangjunlei26/servo,CJ8664/servo,karlito40/servo,bjwbell/servo,fiji-flo/servo,echochamber/servo,saneyuki/servo,jlegendary/servo,RenaudParis/servo,huonw/servo,Adenilson/prototype-viewing-distance,aidanhs/servo,jimberlage/servo,saneyuki/servo,wpgallih/servo,samfoo/servo,canaltinova/servo,GreenRecycleBin/servo,jgraham/servo,pgonda/servo,SimonSapin/servo,CJ8664/servo,dvberkel/servo,huonw/servo,notriddle/servo,anthgur/servo,pgonda/servo,nerith/servo,larsbergstrom/servo,szeged/servo,jlegendary/servo,nick-thompson/servo