feat(library/match): match modulo eta
feat(library/match): match modulo eta

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