fix(frontends/lean/structure_cmd): when error recovery is enabled, we must not assume the expression in the fixed line is a binding expression (it may be a `sorry` expression)
fix(frontends/lean/structure_cmd): when error recovery is enabled, we must not assume the expression in the fixed line is a binding expression (it may be a `sorry` expression)

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