fix(library/type_context): remove incorrect assertions
fix(library/type_context): remove incorrect assertions

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