G/Node/index.html#type-t">CFG.Node.t</a> <span>&#45;&gt;</span> <a href="../../ProcCfg/InstrNode/index.html#type-instr_index">ProcCfg.InstrNode.instr_index</a> <span>&#45;&gt;</span> <a href="index.html#type-instr">instr</a> <span>&#45;&gt;</span> <a href="Domain/index.html#type-t">Domain.t</a></code></dt><dd><p><code>exec_instr astate proc_data node idx instr</code> should usually return <code>astate'</code> such that <code>{astate} instr {astate'}</code> is a valid Hoare triple. In other words, <code>exec