fix(frontends/lean/parser): fix spurious "uses 'sorry'" messages
fix(frontends/lean/parser): fix spurious "uses 'sorry'" messages

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