fix(library/tactic/rewrite_tactic): potential crash in the rewrite tactic
fix(library/tactic/rewrite_tactic): potential crash in the rewrite tactic

soonhokong/lean-osx,digama0/lean,soonhokong/lean-windows,avigad/lean,johoelzl/lean,rlewis1988/lean,fpvandoorn/lean,rlewis1988/lean,avigad/lean,sp3ctum/lean,leanprover-community/lean,dselsam/lean,dselsam/lean,Kha/lean,sp3ctum/lean,leodemoura/lean,leodemoura/lean,eigengrau/lean,UlrikBuchholtz/lean,fpvandoorn/lean,johoelzl/lean,fgdorais/lean,levnach/lean,leanprover/lean,digama0/lean,htzh/lean,sp3ctum/lean,soonhokong/lean-windows,javra/lean,avigad/lean,leanprover/lean,leanprover-community/lean,Kha/lean,rlewis1988/lean,soonhokong/lean-osx,fpvandoorn/lean,soonhokong/lean-osx,UlrikBuchholtz/lean,dselsam/lean,htzh/lean,leanprover/lean,johoelzl/lean,fgdorais/lean,rlewis1988/lean,levnach/lean,Kha/lean,levnach/lean,johoelzl/lean,eigengrau/lean,soonhokong/lean-windows,rlewis1988/lean,c-cube/lean,soonhokong/lean,leanprover-community/lean,digama0/lean,soonhokong/lean-windows,c-cube/lean,fgdorais/lean,fpvandoorn/lean,levnach/lean,leodemoura/lean,leanprover/lean,avigad/lean,leanprover/lean,soonhokong/lean,eigengrau/lean,eigengrau/lean,fgdorais/lean,Kha/lean,eigengrau/lean,dselsam/lean,soonhokong/lean,fpvandoorn/lean,levnach/lean,fgdorais/lean,soonhokong/lean-windows,soonhokong/lean-osx,Kha/lean,fgdorais/lean,htzh/lean,sp3ctum/lean,htzh/lean,fpvandoorn/lean2,leanprover-community/lean,leodemoura/lean,Kha/lean,leodemoura/lean,UlrikBuchholtz/lean,soonhokong/lean,UlrikBuchholtz/lean,leanprover-community/lean,javra/lean,dselsam/lean,digama0/lean,fpvandoorn/lean2,johoelzl/lean,leanprover-community/lean,rlewis1988/lean,avigad/lean,fpvandoorn/lean,leanprover/lean,soonhokong/lean-osx,soonhokong/lean,c-cube/lean,fpvandoorn/lean2,javra/lean,johoelzl/lean,htzh/lean,avigad/lean,dselsam/lean,c-cube/lean,digama0/lean,javra/lean,c-cube/lean,fpvandoorn/lean2,sp3ctum/lean,UlrikBuchholtz/lean,leodemoura/lean,digama0/lean,javra/lean,fpvandoorn/lean2