{"ast_node_type":"variable","tokens":[{"end":77,"kind":"keyword","start":0,"text":"let"}]}
        let b_val = bx.context.new_vector_access(None, b, index).to_rvalue();
        let a_val = bx.gcc_int_cast(a_val, new_int_type);
        let b_val = bx.context.new_bitcast(None, b_val, unsigned_type);