{"ast_node_type":"variable","tokens":[{"end":83,"kind":"keyword","start":0,"text":"let"}]}
    let bound_vars = generic_params.bound_vars_subst(db, DebruijnIndex::INNERMOST);
    let (sig, binders) = db.callable_item_signature(callable_def).into_value_and_skipped_binders();
    let where_clauses = convert_where_clauses(db, generic_def, &bound_vars);