fix(init/meta/interactive): handle `pure` in parser signature descs
fix(init/meta/interactive): handle `pure` in parser signature descs

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