chore(library/fun_info): patch assertion
chore(library/fun_info): patch assertion

The fixed assertion makes sure we don't get an array-index-out-of-bounds
in the for-loop in the end of the procedure.

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