{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":".map_or(default,"}]}
            .map_or(default, |i| BoundVar::new(binder, i).to_ty(Interner).cast(Interner)),
        chalk_ir::VariableKind::Ty(_ty_kind) => find_var(iv)
        chalk_ir::VariableKind::Lifetime => find_var(iv)