fix(library/type_context): occurs check for universes
fix(library/type_context): occurs check for universes

johoelzl/lean,leanprover-community/lean,dselsam/lean,Kha/lean,digama0/lean,digama0/lean,avigad/lean,fgdorais/lean,fgdorais/lean,leodemoura/lean,rlewis1988/lean,digama0/lean,johoelzl/lean,rlewis1988/lean,soonhokong/lean-windows,Kha/lean,fpvandoorn/lean,leanprover/lean,leodemoura/lean,leanprover/lean,leanprover-community/lean,avigad/lean,soonhokong/lean-osx,leanprover-community/lean,Kha/lean,dselsam/lean,avigad/lean,avigad/lean,johoelzl/lean,leodemoura/lean,leanprover/lean,leanprover/lean,leodemoura/lean,fpvandoorn/lean,soonhokong/lean-windows,soonhokong/lean-osx,leanprover/lean,johoelzl/lean,soonhokong/lean-osx,Kha/lean,rlewis1988/lean,soonhokong/lean-osx,soonhokong/lean-windows,fgdorais/lean,fgdorais/lean,Kha/lean,soonhokong/lean-osx,soonhokong/lean-windows,rlewis1988/lean,johoelzl/lean,avigad/lean,dselsam/lean,avigad/lean,rlewis1988/lean,leanprover/lean,fgdorais/lean,digama0/lean,dselsam/lean,fgdorais/lean,fpvandoorn/lean,dselsam/lean,Kha/lean,leanprover-community/lean,soonhokong/lean-windows,digama0/lean,leanprover-community/lean,digama0/lean,rlewis1988/lean,fpvandoorn/lean,johoelzl/lean,leodemoura/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover-community/lean,leodemoura/lean,dselsam/lean