feat(library/abbreviation): apply eta-reduction when expanding abbreviations
feat(library/abbreviation): apply eta-reduction when expanding abbreviations

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