{"ast_node_type":"variable","tokens":[{"end":58,"kind":"keyword","start":0,"text":"let"}]}
    let fam = FamousDefs(sema, sema.scope(expr)?.krate());
) -> Option<(hir::Variant, hir::Variant)> {
    let option_variants = fam.core_option_Option()?.variants(sema.db);